# Paleobiota of the Yixian Formation

The Yixian Formation (simplified Chinese: 义县组; traditional Chinese: 義縣組; pinyin: Yìxiàn zǔ) is a geological formation in Jinzhou, Liaoning, People's Republic of China, that spans about 1.6 million years during the early Cretaceous period (Barremian-Aptian stage). It is known for its fossils, listed below.
The Yixian Formation is divided into the following subunits: (ages from Zhong et al., 2021 unless otherwise noted)
* Upper Yixian (124.1 Ma) ("Jingangshan Bed") ("Dawangzhangzi Bed")
* Upper Lava Unit
* Jianshangou Unit (125.46 Ma)
* Lower Lava Unit
* Lujiatun Unit (125.76–125.68 Ma)

## Sauropods

| Genus | Species | County | Member | Material | Notes | Images |
| Dongbeititan | D. dongi | Beipiao | Jianshangou Bed | Partial postcrania | A basal titanosauriform | Euhelopus |
| cf. Euhelopus | cf. E. sp. | | Lujiatun Bed | Isolated teeth | A basal titanosauriform | Euhelopus |
| Liaoningotitan | L. sinensis | | | nearly complete skeleton | A basal titanosauriform | Euhelopus |
| Ruixinia | R. zhangi | Beipiao | | A partial articulated skeleton | A somphospondylan titanosauriform | Euhelopus |
| Sauropoda spp. | | | Lujiatun & Jianshangou Beds | Isolated vertebrae and teeth | One or more species of sauropods, possibly titanosaurs, have been recovered from the Yixian Formation, though most remain undescribed | Euhelopus |

## Ornithischians

The dinosaurs listed below were compiled in a survey by Xu and Norell in 2006, unless otherwise noted.

### Ankylosaurs

| Genus | Species | County | Member | Material | Notes | Images |
| Liaoningosaurus | L. paradoxus | Yixian | Dawangzhangzi Bed | "Partial skull [and] skeleton." | A small ankylosaur | Liaoningosaurus |

### Ceratopsians

| Genus | Species | County | Member | Material | Notes | Images |
| Liaoceratops | L. yanzigouensis | Beipiao | Lujiatun Bed | "[Two] nearly complete skulls, juvenile to adult." | A ceratopsian | Liaoceratops Psittacosaurus |
| Psittacosaurus | P. lujiatunensis | Beipiao | Lujiatun & Jianshangou Beds | Thousands of specimens in the Lujiatun Bed, somewhat less common in the Jianshangou Bed | A ceratopsian | Liaoceratops Psittacosaurus |

### Ornithopods

| Genus | Species | County | Member | Material | Notes | Images |
| Bolong | B. yixianensis | | Jianshangou Bed | A nearly complete skeleton. | An iguanodontian ornithopod | Bolong Jeholosaurus Jinzhousaurus |
| Changmiania | C. liaoningensis | | Lujiatun Bed | Two nearly complete skeletons | A basal ornithopod that may have dug burrows | Bolong Jeholosaurus Jinzhousaurus |
| Jeholosaurus | J. shangyuanensis | Beipiao | Lujiatun Bed | "Skull with associated vertebrae and hindlimb, skull with cervical vertebrae." | An ornithopod | Bolong Jeholosaurus Jinzhousaurus |
| Jinzhousaurus | J. yangi | Yixian | Dawangzhangzi Bed | "Nearly complete skull and skeleton." | An ornithopod | Bolong Jeholosaurus Jinzhousaurus |

## Theropods

The dinosaurs listed below were compiled in a survey by Xu and Norell in 2006, unless otherwise noted.

### Avialans

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | County | Member | Material | Notes | Images |
| Abitusavis | A. lii | Ningcheng | | "Nearly complete skeleton." | | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Archaeorhynchus | A. spathula | | Dawangzhangzi Bed | | An early, advanced short-tailed bird (ornithuran) | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Changchengornis | C. hengdaoziensis | | Jianshangou Bed | "Nearly complete skeleton." | A confuciusornithid | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Confuciusornis | C. chuonzhous | | | | Junior synonym of Confuciusornis sanctus | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Confuciusornis | C. dui | | Jianshangou Bed | "[Two] skeletons." | | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Confuciusornis | C. feducciai | | Jianshangou Bed | | | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Confuciusornis | C. sanctus | | Jianshangou and Dawangzhangzi Beds | "Hundreds of complete skeletons." | A primitive short-tailed bird (pygostylian), also present in the Jiufotang Formation | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Confuciusornis | C. suniae | | | | Junior synonym of Confuciusornis sanctus | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Dalingheornis | D. liweii | | Dawangzhangzi Bed | | An Enantiornithine | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Eoenantiornis | E. buhleri | | Jianshangou Bed | "Nearly complete skeleton." | An entantiornithine | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Eogranivora | E. edentulata | | Dawangzhangzi Bed | "nearly complete skeleton with skull" | An ornithuromorph | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Iteravis | I. huchzermeyeri | | | | An ornithuromorph | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Jinzhouornis | J. yixianensis | | Jianshangou Bed | | A pygostylian, a junior synonym of Confuciusornis sanctus | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Jinzhouornis | J. zhangjiyingia | | Jianshangou Bed | | Junior synonym of C. sanctus | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Jixiangornis | J. orientalis | | Jianshangou Bed | | A basal avialan, also present in the Jiufotang Formation | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Hongshanornis | H. longicresta | | Jianshangou and Dawangzhangzi Beds | 4 specimens | An ornithuromorph | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Jibeinia | J. luahera | | | | Previously regarded as Yixian, horizon reassigned to the Huajiying Formation by Jin et al., 2008. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Liaoningornis | L. longidigitris | | Lujiatun Bed | "Partial skeleton." | An enantiornithine. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Liaoxiornis | L. delicatus | | Dawangzhangzi Bed | | Considered a nomen dubium because the name is based on remains of a hatchling entantiornithine and cannot be confidently matched with the adult form. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Lingyuanornis | L. parvus | | Dawangzhangzi Bed | | Junior objective synonym of Liaoxiornis delicatus, a nomen dubium. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Longicrusavis | L. houi | | Dawangzhangzi Bed | | An ornithuromorph | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Longirostravis | L. hani | | bed unknown | | An enantiornithine | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Protopteryx | P. fengningensis | | | | Previously regarded as Yixian, horizon reassigned to the Huajiying Formation by Jin et al., 2008. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Mirusavis | M. parvus | | | Partial skeleton. | An immature female enantiornithine preserved with medullary bone tissue. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Sapeornis | S. chaoyangensis | | | Nearly comeplete skeleton. | A subadult omnivoropterygid with preserved feathers. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Shanweiniao | S. cooperorum | | Dawangzhangzi Bed | | An enantiornithine. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Vescornis | V. hebeiensis | | | | Previously regarded as Yixian, horizon reassigned to the Huajiying Formation by Jin et al., 2008. | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Yixianosaurus | Y. longimanus | | Dawangzhangzi Bed | | An anchiornithid | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |
| Zhongornis | Z. haoae | | Dawangzhangzi Bed | | A primitive avialan with a short but non-pygostylian tail | Changchengornis Confuciusornis sanctus Eogranivora Hongshanornis Liaoningornis Liaoxiornis Shanweiniao Yixianosaurus |

### Compsognathids

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | County | Member | Material | Notes | Images |
| Huadanosaurus | H. sinensis | | Dawangzhangzi Bed | A nearly complete specimen missing the feet and end of the tail | A compsognathid | HuadanosaurusSinocalliopteryx gigas Sinosauropteryx lingyuanensis Sinosauropteryx prima |
| Huaxiagnathus | H. orientalis | Beipiao | Jianshangou Bed | | A compsognathid | HuadanosaurusSinocalliopteryx gigas Sinosauropteryx lingyuanensis Sinosauropteryx prima |
| Sinocalliopteryx | S. gigas | Beipiao | Jianshangou Bed | | A large compsognathid | HuadanosaurusSinocalliopteryx gigas Sinosauropteryx lingyuanensis Sinosauropteryx prima |
| Sinosauropteryx | S. lingyuanensis | | Dawangzhangzi Bed | A nearly complete specimen | A compsognathid | HuadanosaurusSinocalliopteryx gigas Sinosauropteryx lingyuanensis Sinosauropteryx prima |
| Sinosauropteryx | S. prima | Beipiao & Lingyuan | Jianshangou & Dawangzhangzi Beds | Four nearly complete specimens | A compsognathid. The first non-avian dinosaur found with feather impressions. | HuadanosaurusSinocalliopteryx gigas Sinosauropteryx lingyuanensis Sinosauropteryx prima |
| Sinosauropteryx | S.? sp. | Beipiao | Jianshangou Bed | One specimen (GMV 2124) with partial skull, postcrania, and preserved feathers | An unnamed coelurosaur originally described as a specimen of Sinosauropteryx, later suggested to be a new genus and species, probably a tyrannosauroid. | HuadanosaurusSinocalliopteryx gigas Sinosauropteryx lingyuanensis Sinosauropteryx prima |

### Dromaeosaurs

| Genus | Species | County | Member | Material | Notes | Images |
| Changyuraptor | C. yangi | Jianchang | | A complete articulated specimen with extensive feathering. | A dromaeosaurid | Changyuraptor Graciliraptor Sinornithosaurus millenii Tianyuraptor Zhenyuanlong Zhongjianosaurus |
| Graciliraptor | G. lujiatunensis | Beipiao | Lujiatun Bed | An incomplete specimen. | A dromaeosaurid | Changyuraptor Graciliraptor Sinornithosaurus millenii Tianyuraptor Zhenyuanlong Zhongjianosaurus |
| Sinornithosaurus | S. haoiana | Yixian | Dawangzhangzi Bed | | Might be a junior synonym of Sinornithosaurus millenii. | Changyuraptor Graciliraptor Sinornithosaurus millenii Tianyuraptor Zhenyuanlong Zhongjianosaurus |
| Sinornithosaurus | S. millenii | Beipiao | Jianshangou Bed | Three specimens with skulls and postcrania, two with preserved feathers. Feathered integument is also preserved. | A dromaeosaurid, the first ever found with feather impressions. | Changyuraptor Graciliraptor Sinornithosaurus millenii Tianyuraptor Zhenyuanlong Zhongjianosaurus |
| Tianyuraptor | T. ostromi | Lingyuan | Dawangzhangzi Bed | | A dromaeosaurid | Changyuraptor Graciliraptor Sinornithosaurus millenii Tianyuraptor Zhenyuanlong Zhongjianosaurus |
| Zhenyuanlong | Z. suni | Jianchang | | One nearly complete skeleton with preserved feathers, including long tail feathers and large wing feathers. | A dromaeosaurid | Changyuraptor Graciliraptor Sinornithosaurus millenii Tianyuraptor Zhenyuanlong Zhongjianosaurus |
| Zhongjianosaurus | Z. yangi | Lingyuan | | A partial skeleton includes an arm, legs, vertebrae, ribs, and most of the tail. | A microraptorian dromaeosaurid with very long legs. | Changyuraptor Graciliraptor Sinornithosaurus millenii Tianyuraptor Zhenyuanlong Zhongjianosaurus |
| Unnamed dromaeosaurid | Specimen NGMC 91 | Lingyuan | Dawangzhangzi Bed | Complete specimen with feather imprints | A juvenile dromaeosaurid that may be a specimen of Sinornithosaurus millenii. Informally nicknamed "Dave". | Changyuraptor Graciliraptor Sinornithosaurus millenii Tianyuraptor Zhenyuanlong Zhongjianosaurus |

### Ornithomimosaurs

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | County | Member | Material | Notes | Images |
| Hexing | H. qingyi | Beipiao | Lujiatun | | A primitive ornithomimosaur | Shenzhousaurus |
| Shenzhousaurus | S. orientalis | Beipiao | Lujiatun Bed | "Articulated skull and incomplete skeleton." | A primitive ornithomimosaur | Shenzhousaurus |

### Oviraptorosaurs

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | County | Member | Material | Notes | Images |
| Caudipteryx | C. dongi | Beipiao | Jianshangou Bed | "[One] partial postcranium with feather imprints." | Oviraptorosaurs | Caudipteryx zoui Incisivosaurus Protarchaeopteryx |
| Caudipteryx | C. zoui | Beipiao | Jianshangou Bed | Common, only over a small region | Oviraptorosaurs | Caudipteryx zoui Incisivosaurus Protarchaeopteryx |
| Caudipteryx | C. sp. | | | | Oviraptorosaurs | Caudipteryx zoui Incisivosaurus Protarchaeopteryx |
| Incisivosaurus | I. gauthieri | Beipiao | Lujiatun Bed | "[One] skull [and a] partial cervical." | An oviraptorosaur | Caudipteryx zoui Incisivosaurus Protarchaeopteryx |
| Ningyuansaurus | N. wangi | | | Complete skeleton with feather impressions. | An oviraptorosaur | Caudipteryx zoui Incisivosaurus Protarchaeopteryx |
| Protarchaeopteryx | P. robusta | Beipiao | Jianshangou Bed | "Nearly complete skull and skeleton, at least [two] individuals." | A possible relative of Incisivosaurus | Caudipteryx zoui Incisivosaurus Protarchaeopteryx |
| Similicaudipteryx | S. yixianensis | | | Two specimens | An oviraptorosaur, also present in the Jiufotang Formation | Caudipteryx zoui Incisivosaurus Protarchaeopteryx |
| Xingtianosaurus | X. ganqi | Liaoning | Dakangpu Bed | One nearly complete specimen (IVPP V13390), minus the head | An oviraptorosaur | Caudipteryx zoui Incisivosaurus Protarchaeopteryx |

### Therizinosaurs

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | County | Member | Material | Notes | Images |
| Beipiaosaurus | B. inexpectus | Beipiao | Jianshangou Bed | "Incomplete skeleton with integument." | A therizinosaur | Beipiaosaurus Jianchangosaurus |
| Jianchangosaurus | J. yixianensis | Jianchang | | A nearly complete juvenile specimen with feather impressions. | A therizinosaur | Beipiaosaurus Jianchangosaurus |

### Troodontids

| Genus | Species | County | Member | Material | Notes | Images |
| Daliansaurus | D. liaoningensis | Beipiao | Lujiatun Bed | A very complete specimen. | A troodontid | Daliansaurus Jianianhualong Liaoningvenator Mei Sinovenator Sinusonasus |
| Jianianhualong | J. tengi | Beipiao | Dawangzhangzi Bed | A very complete specimen with feather impressions. | A troodontid | Daliansaurus Jianianhualong Liaoningvenator Mei Sinovenator Sinusonasus |
| Liaoningvenator | L. curriei | Beipiao | | A very complete specimen. | A troodontid | Daliansaurus Jianianhualong Liaoningvenator Mei Sinovenator Sinusonasus |
| Mei | M. long | Beipiao | Lujiatun Bed | | A small troodontid fossilized in a sleeping position | Daliansaurus Jianianhualong Liaoningvenator Mei Sinovenator Sinusonasus |
| Sinovenator | S. changii | Beipiao | Lujiatun Bed | Three specimens with partial skulls and postcrania. Hundreds of additional specimens known but undescribed. | A troodontid | Daliansaurus Jianianhualong Liaoningvenator Mei Sinovenator Sinusonasus |
| Sinusonasus | S. magnodens | Beipiao | Lujiatun Bed | | A troodontid | Daliansaurus Jianianhualong Liaoningvenator Mei Sinovenator Sinusonasus |
| Undescribed deinonychosaur/possible troodontid | | | Dawangzhangzi Bed | One specimen with feather imprints | A possible troodontid. | Daliansaurus Jianianhualong Liaoningvenator Mei Sinovenator Sinusonasus |
| Undescribed troodontid | Specimen CAGS-IG01-004 | | Lujiatun Bed | Skull and partial skeleton | A troodontid similar to Mei. | Daliansaurus Jianianhualong Liaoningvenator Mei Sinovenator Sinusonasus |

### Tyrannosaurs and other theropods

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | County | Member | Material | Notes | Images |
| Dilong | D. paradoxus | Beipiao | Lujiatun & Jianshangou Bed | Rare | A tyrannosauroid | Dilong Yutyrannus |
| Grallator | | | lower Jianshangou Bed | | Footprints belonging to the Grallator form taxon, belonging to a small theropod. Of known Yixian theropods, the footprints most closely match Caudipteryx. | Dilong Yutyrannus |
| Raptorex | R. kriegsteini | | | | A tyrannosaurid, probably from higher Mongolian strata. | Dilong Yutyrannus |
| Scansoriopteryx | S. heilmanni | | | | Initially reported from the Dawangzhangzi Bed, probably from the Daohugou Beds instead. | Dilong Yutyrannus |
| Yutyrannus | Y. huali | | Unknown | Three nearly complete skeletons of various ages | A large tyrannosauroid | Dilong Yutyrannus |
| Unnamed theropod | Not yet described | Yixian | Lujiatun Bed | Partial post-cranial skeleton | A possible carnosaur | Dilong Yutyrannus |

## Pterosaurs

The pterosaurs listed below were compiled in a survey by Wang and Zhou in 2006, unless otherwise noted.
| Genus | Species | County | Member | Material | Notes | Images |
| Beipiaopterus | B. chenianus | | Jianshangou Bed | | A ctenochasmatid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Boreopterus | B. cuiae | | Jianshangou Bed | | A boreopterid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Cathayopterus | C. grabaui | | Dawangzhangzi Bed | | A ctenochasmatid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Dendrorhynchoides | D. curvidentatus | | | | An anurognathid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Elanodactylus | E. prolatus | | Jianshangou Bed | | A ctenochasmatid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Eopteranodon | E. lii | Beipiao | | | A tapejarid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Eopteranodon | E. yixianensis | Beipiao | Jianshangou Bed | | A tapejarid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Eosipterus | E. yangi | | Jianshangou Bed | | A ctenochasmatid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Gegepterus | G. changae | | Jianshangou Bed | | A ctenochasmatid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Gladocephaloideus | G. jingangshanensis | | Jianshangou Bed | | A ctenochasmatid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Haopterus | H. gracilis | | Jianshangou Bed | | An ornithocheirid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Luchibang | L. xingzhe | | | One partial skull | An istiodactylid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Moganopterus | M. zhuiana | | Lujiatun bed? | | A ctenochasmatid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Ningchengopterus | N. liuae | | Jianshangou or Dawangzhangzi bed | | A pterodactyloid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Nurhachius | N. sp. | | Jingangshan Member | An incomplete specimen | An istiodactylid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Pterofiltrus | P. qiui | | Jianshangou Bed | | A ctenochasmatid | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Yixianopterus | Y. jingangshanensis | | | | An istiodactyliform | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |
| Zhenyuanopterus | Z. longirostris | | Jianshangou Bed | | A boreopterid. May be adult form of Boreopterus. | Feilongus Gladocephaloideus Haopterus Moganopterus Ningchengopterus |

## Misc. reptiles
### Choristoderans

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | Member | Material | Notes | Images |
| Hyphalosaurus | H. lingyuanensis | Dawangzhangzi Bed | | | Hyphalosaurus baitaigouensis Monjurosuchus splendens |
| Hyphalosaurus | H. baitaigouensis | Jingangshan Bed | Thousands of specimens | | Hyphalosaurus baitaigouensis Monjurosuchus splendens |
| Monjurosuchus | M. splendens | Dawangzhangzi Bed | | | Hyphalosaurus baitaigouensis Monjurosuchus splendens |
| Sinohydrosaurus | S. lingyuanensis | Dawangzhangzi Bed | | Junior synonym of Hyphalosaurus lingyuanensis | Hyphalosaurus baitaigouensis Monjurosuchus splendens |

### Lizards

| Genus | Species | Member | Notes | Images |
| Dalinghosaurus | D. longidigitus | Jianshangou Bed | A lizard related to shinisaurs | Dalinghosaurus Xianglong |
| Liushusaurus | L. acanthocaudata | Jianshangou or Dawangzhangzi bed | A lizard related to geckos and skinks | Dalinghosaurus Xianglong |
| Xianglong | X. zhaoi | Jianshangou Bed | A gliding lizard related to chameleons and dragon lizards | Dalinghosaurus Xianglong |
| Yabeinosaurus | Y. tenuis | Dawangzhangzi & Jingangshan Beds | A lizard related to geckos and skinks | Dalinghosaurus Xianglong |

### Turtles

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | Member | Notes | Images |
| Manchurochelys | M. liaoxiensis | Jianshangou Bed | Reclassified as Ordosemys liaoxiensis | Ordosemys |
| Manchurochelys | M. manchoukuoensis | Jingangshan Bed | | Ordosemys |
| Ordosemys | O. liaoxiensis | Jianshangou Bed | | Ordosemys |

## Mammals

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
The mammals listed below were compiled in a survey by Meng and colleagues in 2006, unless otherwise noted.
| Genus | Species | County | Member | Material | Notes | Images |
| Acristatherium | A. yanensis | Beipiao | Lujiatun Bed | | A eutherian | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Akidolestes | A. cifellii | Lingyuan | Dawangzhangzi Bed | | A spalacotheriid "symmetrodont" | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Ambolestes | A. zhoui | Nincheng | Jianshangou Bed | | A eutherian | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Chaoyangodens | C. lii | Lingyuan | Dawangzhangzi Bed | | A eutriconodont | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Eomaia | E. scansoria | Lingyuan | Dawangzhangzi Bed | | A tribosphenidan, possibly a eutherian or stem-therian | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Gobiconodon | G. zofiae | Beipiao | Lujiatun Bed | | A gobiconodont | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Gobiconodon | G. luoianus | | Lujiatun Bed | | A gobiconodont; junior synonym of G. zofiae | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Jeholodens | J. jenkinsi | Chaoyang | Jianshangou Bed | | A eutriconodont | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Juchilestes | J. liaoningensis | Beipiao | Lujiatun Bed | | An amphidontid | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Jueconodon | J. cheni | | | | A eutriconodont | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Maotherium | M. sinensis | Chaoyang | Jianshangou Bed | | A zhangeotheriid "symmetrodont" | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Maotherium | M. asiaticus | Beipiao | Lujiatun Bed | | A zhangeotheriid "symmetrodont" | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Meemannodon | M. lujiatunensis | Beipiao | Lujiatun Bed | | A gobiconodont | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Origolestes | O. lii | | | | A zhangeotheriid "symmetrodont" | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Ningchengodon | N. foxi | Ningcheng | Ningcheng Basin | A partial right dentary. | A symmetrodont. | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Repenomamus | R. giganticus | Beipiao | Lujiatun Bed | | A gobiconodont | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Repenomamus | R. robustus | Beipiao | Lujiatun Bed | | A large gobiconodont, which ate small dinosaurs | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Sinobaatar | S. lingyuanensis | Lingyuan | Jianshangou and Dawangzhangzi Beds | | A multituberculate | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Sinodelphys | S. szalayi | Lingyuan | Dawangzhangzi Bed | | A therian, initially interpreted as a metatherian and later reinterpreted as a eutherian | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Yanoconodon | Y. allini | Fengning | | | A eutricondodont | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |
| Zhangheotherium | Z. quinquecuspidens | Chaoyang | Jianshangou Bed | | A zhangeotheriid "symmetrodont" | Eomaia Gobiconodon zofiae Jeholodens Repenomamus robustus Yanoconodon |

## Amphibians

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
| Genus | Species | County | Member | Notes | Images |
| Callobatrachus | C. sanyanensis | Sihetun | Jianshangou Bed | Junior synonym of Liaobatrachus | Liaobatrachus |
| Laccotriton | L. subsolanus | Paozhanggou | Fengshan Bed | A urodelan | Liaobatrachus |
| Liaobatrachus | L. grabaui | Sihetun | Jianshangou Bed | A spadefoot toad | Liaobatrachus |
| Liaobatrachus | L. zhaoi | Beipiao & Heitizigou | Lujiatun Bed & Jianshangou Bed | A spadefoot toad | Liaobatrachus |
| Mesophryne | M. beipiaoensis | Beipiao & Heitizigou | Lujiatun Bed & Jianshangou Bed | Junior synonym of Liaobatrachus | Liaobatrachus |
| Sinerpeton | S. fengshanensis | Paozhanggou | Fengshan Bed | A urodelan | Liaobatrachus |

## Fish

| Genus | Species | Member | Abundance | Notes | Images |
| Hybodontoidea indet. | Family, genus and species indeterminate | | | An elasmobranch known from a single dorsal fin spine | Lycoptera Mesomyzon Protopsephurus Sinamia |
| Lycoptera | L. davidi | Jianshangou & Dawangzhangzi Beds | Also present in the Jiufotang Formation & Huajiying Formation | An osteoglossiform | Lycoptera Mesomyzon Protopsephurus Sinamia |
| Lycoptera | L. muroii | Jingangshan Bed | | An osteoglossiform | Lycoptera Mesomyzon Protopsephurus Sinamia |
| Lycoptera | L. sinensis | Jianshangou Bed | | An osteoglossiform | Lycoptera Mesomyzon Protopsephurus Sinamia |
| Mesomyzon | M. mengae | | | A lamprey | Lycoptera Mesomyzon Protopsephurus Sinamia |
| Peipiaosteus | P. pani | Jianshangou & Dawangzhangzi Bed | Also present in the Jiufotang Formation | A peipiaosteid fish related to sturgeons | Lycoptera Mesomyzon Protopsephurus Sinamia |
| Protopsephurus | P. liui | Dawangzhangzi Bed | Also present in the Jiufotang & Huajiying Formations | A paddlefish | Lycoptera Mesomyzon Protopsephurus Sinamia |
| Sinamia | S. liaoningensis | Jianshangou Bed | | A bowfin | Lycoptera Mesomyzon Protopsephurus Sinamia |
| Yanosteus | Y. longidorsalis | | Also present in the Huajiying Formation | A peipiaosteid | Lycoptera Mesomyzon Protopsephurus Sinamia |

## Invertebrate fauna of the Yixian Formation

The invertebrate species listed below follow a survey by Chen and colleagues published in 2005, unless otherwise noted.

### Arachnids

The arachnid species listed below follow a catalogue compiled by Dunlop, Penney and Jekel in 2010, unless otherwise noted.
| Genus | Species | Notes |
| ?Araneus | A.? aethus | Orb-weaver spiders |
| ?Araneus | A.? beipiaoensis | Orb-weaver spiders |
| ?Araneus | A.? liaoxiensis | Orb-weaver spiders |
| ?Araneus | A.? reheensis | Orb-weaver spiders |
| Cretaraneus | C. liaoningensis | A nephiline spider |
| ?Gnaphosa | G.? liaoningensis | A ground spider |
| Jeholia | J. longchengi | A buthoid scorpion |
| ?Theridion | T.? atalus | A tangle web spider |

### Beetles (Coleoptera)

| Genus | Species | County | Notes |
| Anoixis | A. complanus | | A desmatin click beetle |
| Apoclion | A. antennatus | | Desmatin click beetles |
| Apoclion | A. clavatus | | Desmatin click beetles |
| Apoclion | A. dolini | | Desmatin click beetles |
| Coptoclava | C. longipoda | | A beetle |
| Desmatinus | D. cognatus | | A desmatin click beetle |
| Fortiseode | F. pervalimand | | An eodromeine trachypachid beetle |
| Glaresis | G. orthochilus | | A laresid scarab beetle |
| Hydrophilopsia | H. gracilis | | Hydrophiloid water scavenger beetles |
| Hydrophilopsia | H. hydraenoides | | Hydrophiloid water scavenger beetles |
| Hydrophilopsia | H. shatrovskiyi | | Hydrophiloid water scavenger beetles |
| Lasiosyne | L. integera | Huangbanjigou Village, Liaoning Province, northeastern China. | A lasiosynid beetle. |
| Lasiosyne | L. parva | Huangbanjigou Village, Liaoning Province, northeastern China. | A lasiosynid beetle. |
| Liaoximordella | L. hongi | | A mordellid beetle |
| Mirimordella | M. gracilicruralis | | A mordellid beetle |
| Oxyporus | O. yixianus | | An oxyporine rove beetle |
| Paradesmatus | P. dilatatus | | A desmati click beetle |
| Parageotrupes | P. incanus | | A Geotrupine scarab beetle |
| Sinocupes | S. validus | | A beetle |
| Sinosperchopsis | S. silinae | | A hydrophiloid water scavenger beetle |
| Sinoxytelus | S. breviventer | | Oxyteline rove beetles |
| Sinoxytelus | S. euglypheus | | Oxyteline rove beetles |
| Sinoxytelus | S. longisetosus | | Oxyteline rove beetles |

### Crustaceans

| Genus | Species | County | Member | Notes |
| Chenops | C. oblongus | | | Notostracans |
| Chenops | C. yixianensis | | | Notostracans |
| Cricoidoscelosus | C. aethus | | | Junior synonym of Palaeocambarus |
| Cypridea | C. (Cypridea) liaoningensis | | Jianshangou Bed | Ostracods |
| Cypridea | C. (C.) sihetunensis | | Jianshangou Bed | Ostracods |
| Cypridea | C. (C.) veridica arguta | | Jingangshan Bed | Ostracods |
| Cypridea | C. (C.) sp. | | Jianshangou Bed | Ostracods |
| Cypridea | C. (Ulwellia) beipiaoensis | Beipiao | Jianshangou Bed | Ostracods |
| Damonella | D. formosa | | Jianshangou Bed | An ostracod |
| Darwinula | D. leguminella | | Jianshangou Bed | An ostracod |
| Diestheria | D. jeholensis | | Jianshangou Bed | Clam shrimps |
| Diestheria | D. yixianensis | | Dawangzhangzi Bed | Clam shrimps |
| Diestheria | D.? sp. | | Jianshangou Bed | Clam shrimps |
| Eosestheria | E. jingangshanensis | | Jingangshan Bed | Clam shrimps |
| Eosestheria | E. lingyuanensis | | Dawangzhangzi Bed | Clam shrimps |
| Eosestheria | E. aff. middendorfii | | Jingangshan Bed | Clam shrimps |
| Eosestheria | E. ovata | | Jianshangou Bed | Clam shrimps |
| Eosestheria | E. sihetunensis | | Jianshangou Bed | Clam shrimps |
| Eosestheriopsis | E. gujialingensis | | Jianshangou Bed | A clam shrimp |
| Jeholops | J. hongi | | | A notostracan |
| Liaoningogriphus | L. quadripartitus | | Jianshangou and Dawangzhangzi beds | A shrimp |
| Lycopterocypris | L. infantilis | | Jianshangou Bed | An ostracod |
| Mantelliana | M. sp. | | Jianshangou Bed | An ostracod |
| "Mongolarachne" | "M." chaoyangensis | | Dawangzhangzi Beds | Junior synonym of Palaeocambarus |
| Mongolianella | M. cf. palmosa | | Jianshangou Bed | An ostracod |
| Palaeocambarus | P. licenti | | | A crayfish |
| Rhinocyrpis | R. jurassica | | Jianshangou Bed | An ostracod |
| Timiriasevia | T. jianshangouensis | | Jianshangou Bed | An ostracod |
| ?Yanjiestheria | Y.? beipiaoensis | Beipiao | Jianshangou Bed | A clam shrimp |
| Yanshania | Y. dabeigouensis | | Jianshangou Bed | An ostracod |

### Dragonflies (Odonata)

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
The dragonfly species listed below follow a review compiled by Zhang, Ren and Panf in 2008, unless otherwise noted.
| Genus | Species | County | Member | Abundance | Notes | Images |
| Abrohemeroscopus | A. mengi | | | | A dragonfly | Sinaeschnidia sp. |
| Aeschnidium | A. heishankowense | | | | Reclassified as Sinaeschnidia heishankowense | Sinaeschnidia sp. |
| Aeschnidium | A. sp. | | | | Reclassified as Sinaeschnidia heishankowense | Sinaeschnidia sp. |
| Archaeogomphus | A. labius | | | Nymphs | Reclassified as Yixiangomphus labius, which is a junior synonym of Sinaeschnidia cancellosa | Sinaeschnidia sp. |
| Bellabrunetia | B. catherinae | | | | A dragonfly | Sinaeschnidia sp. |
| Chrysogomphus | C. beipiaoensis | | | | A dragonfly | Sinaeschnidia sp. |
| Dissurus | D. liaoyuanensis | | | Poorly preserved nymph | Reclassified as Sinaeschnidia cf. cancellosa | Sinaeschnidia sp. |
| Dracontaeschnidium | D. orientale | | | | A dragonfly | Sinaeschnidia sp. |
| Hebeiaeschnidia | H. fengningensis | | | | A dragonfly | Sinaeschnidia sp. |
| Huaxiagomphus | H. taushanensis | | | | A dragonfly | Sinaeschnidia sp. |
| Liogomphus | L. yixianensis | | | | A dragonfly | Sinaeschnidia sp. |
| Mesocordulia | M. boreala | | | | A corduliid dragonfly | Sinaeschnidia sp. |
| Palaeogomphus | P. labius | | | | A dragonfly, reclassified as of Yixiangomphus labius, which is a junior synonym of Sinaeschnidia cancellosa | Sinaeschnidia sp. |
| Parapetala | P. liaoningensis | | | | A dragonfly | Sinaeschnidia sp. |
| Parapetala | P. yixianensis | | Jianshangou Unit | | | Sinaeschnidia sp. |
| Protoliupanshania | P. wangi | | Jianshangou Unit | | A liupanshaniid dragonfly | Sinaeschnidia sp. |
| Pseudocymatophlebia | P. bisecta | Ningcheng County | | A well-preserved specimen. | An aktassiid dragonfly | Sinaeschnidia sp. |
| Pseudoliupanshania | P. magnanicellula | | Jianshangou Unit | | | Sinaeschnidia sp. |
| Pseudosamarura | P. largina | | | One specimen, nymph | Reclassified as Sinaeschnidia cf. cancellosa | Sinaeschnidia sp. |
| Rudiaeschna | R. limnobia | | | | An aeshnid dragonfly | Sinaeschnidia sp. |
| Sinaeschnidia | S. heishankowense | | Jianshangou & Dawangzhangzi Beds | Adults and nymphs | | Sinaeschnidia sp. |
| Sinaeschnidia | S. cancellosa | | | | Junior synonym of S. heishankowense | Sinaeschnidia sp. |
| Sinaeschnidia | S. sp. | | | Indeterminate nymph specimens | Some nymph specimens have been given their own genera and species though probably belong so S. heishankowense but too poorly preserved to be certain | Sinaeschnidia sp. |
| Sinogomphus | S. taoshanensis | | | | A dragonfly | Sinaeschnidia sp. |
| Sinojagoria | S. imperfecta | | | | A dragonfly | Sinaeschnidia sp. |
| Sopholibellula | S. amoena | | | | Dragonflies | Sinaeschnidia sp. |
| Sopholibellula | S. eleganti | | | | Dragonflies | Sinaeschnidia sp. |
| Stylaeschnidium | S. rarum | | | | A dragonfly | Sinaeschnidia sp. |
| Telmaeshna | T. paradoxica | Beipiao | | | A dragonfly | Sinaeschnidia sp. |
| Turanophlebia | T. liaoningensis | Beipiao | Jianshangou Unit | | A tarsophlebiid dragonfly. | Sinaeschnidia sp. |
| Yixiangomphus | Y. labius | | | Nymphs | Junior synonym of Sinaeschnidia cancellosa | Sinaeschnidia sp. |

### Flies (Diptera)

| Genus | Species | Member | Notes |
| Alleremonomus | A. xingi | Jianshangou Bed | A brachyceran fly |
| Atalosciophila | A. yanensis | | A mycetophilid gnat |
| Chironomaptera | C. gregaria | | A phantom midge |
| Gigantoberis | G. liaoningensis | | A soldier fly |
| Lichnoplecia | L. kovalevi | | A protopleciid fly |
| Palaepangonius | P. eupterus | | A horse-fly |
| Protapiocera | P. megista | | An asiloid fly |
| Protempis | P. minuta | | A brachyceran fly |
| Protonemestrius | P. jurassicus | | A tangle-veined fly |

### Wasps (Hymenoptera)

| Genus | Species | County | Member | Notes |
| Abropelecinus | A. annulatus | Beipiao | | An iscopinine pelecinid |
| Angaridyela | A. robusta | | Jianshangou Bed | A sawfly |
| Azygopelecinus | A. clavatus | Beipiao | | An iscopinine pelecinid |
| Chengdeserphus | C. petidatus | | | A proctotrupid wasp |
| Cretevania | C. exquisita | Beipiao | | Hatchet wasps |
| Cretevania | C. pristine | Beipiao | Jianshangou bed | Hatchet wasps |
| Cretevania | C. vesca | Beipiao | | Hatchet wasps |
| Hoplitolyda | H. duolunica | | | The largest known sawfly ever |
| Liaotoma | L. linearis | | | A xyelotomid woodwasp |
| Manlaya | M. flexuosus | | | An aulacid woodwasp |
| Procretevania | P. exquisita | | | Reclassified as Cretevania spp. |
| Procretevania | P. pristine | | | Reclassified as Cretevania spp. |
| Procretevania | P. vesca | | | Reclassified as Cretevania spp. |
| Rudisiricius | R. belli | | | Praesiricid sawflies |
| Rudisiricius | R. celsus | | | Praesiricid sawflies |
| Rudisiricius | R. crassinodus | | | Praesiricid sawflies |
| Scolichneumon | S. rectivenius | | | An ichneumonoid wasp |
| Sinopelecinus | S. viriosus | | | A pelecinid |
| Tanychora | T. exquisita | | Jianshangou Bed | An ichneumon wasp |

### Other insects

| Genus | Species | County | Member | Notes | Images |
| Abrigramma | A. calophleba | | | A kalligrammatid lacewing | |
| Alloraphidia | A. bliquivenatica | | | Snakeflies | |
| Alloraphidia | A. longistigmasa | | Jianshangou Bed | Snakeflies | |
| Archeraphidia | A. shangyuanensis | | | A snakefly |
| Baissopterus | B. liaoningensis | | | A snakefly |
| Caenoephemera | C. shangyuanensis | | Jianshangou Bed | A mayfly |
| Caloraphidia | C. glossophylla | | | A snakefly | |
| Choromyrmeleon | C. othneius | | | An antlion | |
| Circulaboilus | C. aureus | | | A grig |
| Cretophasmomima | C. melanogramma | | | A stick insect | Cretophasmomima, a stick insect |
| ?Ephemeropsis | ?E. trisetalis | | Jianshangou and Jingangshan beds | A mayfly. Chinese specimens probably represent species of Epicharmeropsis | |
| Epicharmeropsis | E. hexavenulosus | Pingquan | | Mayflies |
| Epicharmeropsis | E. quadrivenulosus | Beipiao | Jianshangou Bed | Mayflies | |
| Hagiphasma | H. paradoxa | | Jianshangou Bed | A stick insect | |
| Ilerdocossus | I. beipiaoensis | | | Palaeontinid hemipterans |
| Ilerdocossus | I. exiguus | | | Palaeontinid hemipterans |
| Ilerdocossus | I. exquisitus | | | Palaeontinid hemipterans |
| Ilerdocossus | I. fengningensis | | | Palaeontinid hemipterans |
| Ilerdocossus | I. hui | | | Palaeontinid hemipterans |
| Ilerdocossus | I. pingquanensis | | | Palaeontinid hemipterans |
| Ithigramma | I. multinervia | | | Kalligrammatid lacewings | |
| Kalligramma | K. liaoningensis | | Jianshangou Bed | Kalligrammatid lacewings | |
| Karatavoblatta | K. formosa | | | A cockroach | |
| Liaoaphidia | L. fornicata | | | A snakefly | |
| Liaonemobius | L. tanae | | | A sword-tail cricket | |
| Longicellochrysa | L. yixiana | | | A mesochrysopid lacewing | |
| Mesascalaphus | M. yangi | | | An owlfly | |
| Mesolygaeus | M. laiyangensis | | | A water bug | |
| Metabittacus | M. colosseus | | Jianshangou Bed | A scorpionfly | |
| Miracossus | M. gongi | | | Palaeontinid hemipterans |
| Miracossus | M. ingentius | | | Palaeontinid hemipterans |
| Nipponoblatta | N. acerba | | Jianshangou Bed | A cockroach |
| Oloberotha | O. sinica | | | A beaded lacewing |
| Oregramma | O. aureolosa | | | Kalligrammatid lacewings | |
| Oregramma | O. illecebrosa | | | Kalligrammatid lacewings | |
| Pseudopulex | P. magnus | | | Stem-fleas |
| Pseudopulex | P. tanlan | | | Stem-fleas | |
| Renphasma | R. sinica | | | A stick insect | |
| Saurophthirus | S. exquisitus | | | Stem-fleas | |
| Saurophthirus | S. laevigatus | | | Stem-fleas | |
| Sinochresmoda | S. magnicornia | | | A chresmodid water-skiing insect | |
| Sinosharaperla | S. zhaoi | Beipiao | | A stonefly | |
| Sinoviparosiphum | S. lini | | | An aphid | |
| Sophogramma | S. lii | | Jianshangou Bed | Kalligrammatid lacewings | |
| Sophogramma | S. pingquanica | | | Kalligrammatid lacewings | |
| Tetraphelerus | T. laetus | | | A moth | |
| Tyrannopsylla | T. beipiaoensis | | | A stem-flea | |
| Varicapitatus | V. sinuolatus | "Huangbanjigou, Chaomidian Village, Beipiao City." | | A hemipteran | |
| Unnamed Vitimotauliidae | Unnamed | | | A caddisfly pupa, likely belonging to the Vitimotauliidae | |

### Molluscs

| Genus | Species | Member | Notes |
| Amplovalvata | A. sp. | Jianshangou Bed | A gastropod |
| Arguniella | A. lingyuanensis | Jianshangou Bed | A bivalve, also present in the Jiufotang and Fuxin Formations |
| Arguniella | A. yanshanensis | Jianshangou Bed | A bivalve, also present in the Jiufotang Formation |
| Bithynia | B. haizhouensis | Jingangshan Bed | A gastropod |
| Corbicula | C. anderssoni | Jianshangou Bed | Reclassified as Sphaerium anderssoni |
| Corbicula | C. jeholense | Jianshangou Bed | Reclassified as Sphaerium jeholense |
| Gyraulus | G. sp. | Jianshangou Bed | A ramshorn snail |
| Probaicalia | P. vitimensis | Jianshangou Bed | A gastropod |
| Ptychastylus | P. harpaeformis | Jianshangou Bed | Gastropods |
| Ptychastylus | P. cf. phillipi | Jianshangou Bed | Gastropods |
| Sphaerium | S. anderssoni | Jianshangou Bed | A fingernail clam, also present in the Jiufotang Formation |
| Sphaerium | S. jeholense | Jianshangou Bed | Junior synonym of S. anderssoni |
| Sphaerium | S. selenginense | Jianshangou Bed | Junior synonym of S. anderssoni |
| ?Viviparus | V.? cf. matsumotoi | Jingangshan Bed | A snail |

## Flora of the Yixian Formation
### Conifers

The coniferous trees and shrubs listed below were compiled in a survey by Wang and colleagues in 2006, unless otherwise noted.
| Genus | Species | Member | Notes |
| Brachyphyllum | | | A cypress-like conifer |
| Cephalotaxopsis | | | A yew |
| Cunninghamia | | | A cypress |
| Elatides | | | A cypress |
| Elatocladus | E. leptophyllus | | Conifers of uncertain classification |
| Elatocladus | E. manchurica | | Conifers of uncertain classification |
| Liaoningocladus | L. boii | Jingangshan Bed | A conifer of uncertain classification |
| Pagiophyllum | | | A cypress-like conifer |
| Pityocladus | | | A pine |
| Pityolepis | P. sp. | | A pine |
| Pityophyllum | P. cf. lindstroemi | | A pine |
| Pityostrobus | | | A pine |
| Podozamites | P. lanceolatus | | A conifer of uncertain classification |
| Schizolepis | S. jeholensis | | |
| ?Sequoia | S.? jeholensis | | |
| Taxus | | | A yew |
| Torreya | | | A yew |
| Yanliaoia | Y. sinensis | | |

### Ferns

| Genus | Species | Notes |
| Cladophlebis | C. spp. | |
| Coniopteris | C. sp. | |
| Onychiopsis | O. elongata | Junior synonym of O. psilotoides |
| Onychiopsis | O. psilotoides | |
| ?Ruffordia | R.? sp. | |

### Flowering plants

| Genus | Species | County | Member | Notes | Images |
| Archaefructus | A. eoflora | | Jianshangou Bed | A primitive, aquatic angiosperm | Archaefructus |
| Archaefructus | A. liaoningensis | | Jianshangou Bed | | Archaefructus |
| Archaefructus | A. sinensisis | | Dawangzhangzi Bed | | Archaefructus |
| Callianthus | C. dilae | Liaoning | | A plant with true flowers |
| ?Davallia | D.? niehhutzuensis | | | |
| Erenia | E. stenoptera | Liaoning | | Actually a specimen of Callianthus |
| Leefructus | L. mirus | | | A eudicot |
| Liaoxia | L. chenii | | | |
| ?Potamogeton | P.? jeholensis | | | |
| Ranunculus | R. jeholensis | | | Junior synonym of Potamogeton jeholensis |
| Sinocarpus | S. decussatus | | | A primitive eudicot |

### Ginkgos

| Genus | Species |
| Baiera | B. cf. gracilis |
| Baiera | B. orientalis |
| Czekanowskia | C. rigida |
| Ginkgo | G. apodes |
| Ginkgoites | G. sibiricus |
| Leptostrobus | L. sp. |
| ?Nageiopsis | N.? sp. |
| Phoenicopsis | P. cf. augustifolia |
| Solenites | S. sp. |
| Sphenobaiera | S. longifola |

### Other plants

| Genus | Species | County | Member | Notes | Images |
| Archaeamphora | A. longicervia | | | Originally described as pitcher plant, later study confirmed that it is likely to be an insect galls on Liaoningocladus. | Archaeamphora |
| Chaoyangia | C. liangii | | | A gnetale gymnosperm | Archaeamphora |
| Chaoyangicarpus | C. liangii | | | Junior synonym of Chaoyangia liangii | Archaeamphora |
| Ephedra | E. sp. | | | A gymnosperm | Archaeamphora |
| Equisetum | E. sp. | | | A horsetail | Archaeamphora |
| Eragrosites | E. changii | | | A grass-like gnetale gymnosperm | Archaeamphora |
| Siphonospermum | S. simplex | Beipiao | Jianshangou Bed | A gnetale gymnosperm | Archaeamphora |
| Tyrmia | T. sp. | | | A bennettite | Archaeamphora |