Actinonema Cobb 1920
Creators: name: Chu, Mengdi
name: Hao, Yingdong
name: Huang, Mian
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Chromadorea
Chromadorida
Chromadoridae
Actinonema

description: Key to species of the genus Actinonema including the new species and A. dolichurum
1. Head end with six cuticularised cones ........................................................................................ 2
– Head end without cuticularised cones ....................................................................................... 5
2. Cephalic setae 1 μm, tail long with more than 70% posterior flagellum............................ ........................................................................................... A. dolichurum Gagarin and Long, 2017
– Cephalic setae longer than 2 μm, tail comparatively short ................................................ 3
3. Dorsal tooth large, lateral differentiation without ′V̍ markings .............................................. ........................................................................................................... A. pachydermatum Cobb, 1920
– Dorsal tooth small, lateral differentiation with ′V̍ markings .............................................. 4 4. Body slender (a = 32–44), spicule absent .......... A. smolae Muthumbi and Vincx, 1998
– Body thick (a = 22–23), spicule present ................... ................... A. parvum Gagarin, 2015
5. Tail long with posterior flagellum longer than 70% of total tail length ....................... 6
– Tail comparatively short, without obvious posterior flagellum ........................................ 7
6. Males with extended cuticle in front of cloaca ...... A. longicaudatoides Gagarin, 2015
– Males without extended cuticle in front of cloaca ....................................................................... .............................................................................. A. longicaudatum (Steiner 1918) Wieser 1954
7. Males with spicules ............................................................................................................................. 8
– Males without spicules .................................................................................................................... 11
8. Telamon absent .................................................................................................................................... 9
– Telamon present ................................................................................................................................ 10
9. Dorsal tooth small, spicules 20 μm with cephalic proximal end ............................................ ......................................................................................................................... A. fidatum Vitiello, 1970
– Dorsal tooth large, spicules 24–31 μm with tapered proximal end ...................................... ................................................................................................................................ A. grafi Jensen, 1991
10. Pharynx with double posterior bulbs .................................................. A. diplobulba sp. nov.
– Pharynx without double posterior bulbs ...................................... A. celtica Boucher, 1976
11. Only telamon present, gubernaculum absent, telamon falciform ......................................... ................................................................................................................... A. falciforme Shi et al. 2018
– Both telamon and gubernaculum present, telamon L-shaped with a broad mid part ...................................................................................... A. paraceltica Muthumbi and Vincx, 1998
description: Published as part of Chu, Mengdi, Hao, Yingdong & Huang, Mian, 2023, Two new species of Chromadorida (Nematoda) from the intertidal zone of the Yellow Sea, China, pp. 1364-1376 in Journal of Natural History 57 (25 - 28) on pages 1369-1370, DOI: 10.1080/00222933.2023.2241187, http://zenodo.org/record/10491893