rhinophrynid
Any toad in the family Rhinophrynidae.

rhinophrynids
plural of rhinophrynid

rhinotorid
Any fly in the family Rhinotoridae, now considered to be the heleomyzid subfamily Rhinotorinae.

rhinotorids
plural of rhinotorid

rhipiphorid
Any beetle in the family Ripiphoridae.

rhipiphorids
plural of rhipiphorid

rhizangiid
Any coral of the family Rhizangiidae.

rhizodontid
Any extinct fish in the family Rhizodontidae.
Any fish in the order Rhizodontida, more commonly known as rhizodonts.

rhizodontids
plural of rhizodontid

rhizomyid
Any rodent in the family Rhizomyidae, now considered to be the spalacid subfamily Rhizomyinae, comprising the bamboo rats and mole rats (as opposed to the naked mole rats in the subfamily Spalacinae).

rhizomyids
plural of rhizomyid

rhodacarid
Any mite in the family Rhodacaridae.

rhodacarids
plural of rhodacarid

rhodopid
Any sea snail in the family Rhodopidae.

rhodopids
plural of rhodopid

rhombiferan
Any echinoderm of the class †Rhombifera.

rhopalid
Any bug in the family Rhopalidae.

rhopalids
plural of rhopalid

rhopalosomatid
Any wasp in the family Rhopalosomatidae.

rhopalosomatids
plural of rhopalosomatid

rhyacichthyid
Any fish in the family Rhyacichthyidae.

rhyacichthyids
plural of rhyacichthyid

rhyacophilid
Any caddis fly in the family Rhyacophilidae.

rhyacophilids
plural of rhyacophilid

rhyacotritonid
Any salamander in the family Rhyacotritonidae.

rhyacotritonids
plural of rhyacotritonid

rhynchitid
Any weevil in the family Rhynchitidae, the attelabid subfamily Rhynchitinae in some classifications.

rhynchitids
plural of rhynchitid

rhynchocinetid
Any shrimp in the family Rhynchocinetidae.

rhynchocinetids
plural of rhynchocinetid

rhynchodipterid
Any extinct lungfish in the family Rhynchodipteridae.

rhynchodipterids
plural of rhynchodipterid

rhynchonellate
A brachiopod of the class Rhynchonellata

rhynchonellates
plural of rhynchonellate

rhynchonellid
Any brachiopod of the order Rhynchonellida.

rhynchonellids
plural of rhynchonellid

rhynchophthirine
Any insect of the Rhynchophorus genus.

rhynchosaurid
Any extinct rhynchosaur in the family Rhynchosauridae.

rhynchosaurids
plural of rhynchosaurid

rhyparochromid
Any seed bug in the family Rhyparochromidae.

rhyparochromids
plural of rhyparochromid

rhyphid
Any gnat in the family Rhyphidae, a synonym for the Anisopodidae.

rhyphids
plural of rhyphid

rhytidid
Any predatory snail in the family Rhytididae.

rhytidids
plural of rhytidid

rhytidosteid
Any extinct temnospondyl in the family Rhytidosteidae.

rhytidosteids
plural of rhytidosteid

ribeiroid
Any mollusc of the genus †Ribeiria.

richardiid
Any fly of the family Richardiidae.

richardiids
plural of richardiid

ringiculid
Any sea snail in the family Ringiculidae.

ringiculids
plural of ringiculid

ripiphorid
Any beetle in the family Ripiphoridae.

ripiphorids
plural of ripiphorid

rissoellid
Any sea snail in the family Rissoellidae.

rissoellids
plural of rissoellid

rissoinid
Any sea snail of the family Rissoinidae.

rissoinids
plural of rissoinid

ritten
A young rat.

rivulid
Any fish in the family Rivulidae.

rivulids
plural of rivulid

rivuline
A killifish of the family Nothobranchiidae (African rivulines) or Aplocheilidae (Asian rivulines).

roadrunner
Either of two species of fast-running bird in the genus Geococcyx of the cuckoo family native to North and Central America, the lesser roadrunner (Geococcyx velox) and, especially, the greater roadrunner (Geococcyx californianus).

rockfinch
A pale rockfinch, a bird of species Carpospiza brachydactyla, the sole species in genus Carpospiza, native to Asia.

rockfinches
plural of rockfinch

roeslerstammiid
Any moth in the family Roeslerstammiidae.

roeslerstammiids
plural of roeslerstammiid

romeriid
Any extinct primitive reptile in the family Romeriidae.

romeriids
plural of romeriid

rooklet
A little rook (type of bird).

rooklets
plural of rooklet

roostcock
The male of the domestic fowl; a cock.

roostcocks
plural of roostcock

ropalomerid
Any fly of the family Ropalomeridae.

ropalomerids
plural of ropalomerid

rorations
plural of roration

rostratulid
Any bird in the family Rostratulidae.

rostratulids
plural of rostratulid

rostroconch
Any mollusc of the class Rostroconchia.

rotalite
Any fossil foraminifer of the family Rotaliidae, abundant in chalk formations.

rubidgeine
Any extinct therapsid of the subfamily †Rubidgeinae

rubidgeines
plural of rubidgeine

russellophiid
Any snake of the family Russellophiidae

russellophiids
plural of russellophiid

russellosaurine
Any extinct marine reptile of the subfamily Russellosaurina

russellosaurines
plural of russellosaurine

rutoceratid
Any extinct nautiloid cephalopod in the family Rutoceratidae.

rutoceratids
plural of rutoceratid

sabellariid
Any polychaete worm of the family Sabellariidae.

sabellariids
plural of sabellariid

sabellid
A worm of the genus Sabella or the family Sabellidae.

saccocirrid
Any polychaete worm in the family Saccocirridae.

saccocirrids
plural of saccocirrid

sacoglossan
A marine mollusk of the order Sacoglossa, sap-sucking sea slugs.

sacoglossans
plural of sacoglossan

sagittarid
Alternative form of sagittariid.

sagittarids
plural of sagittarid

sagittariid
Any secretary bird in the family Sagittariidae.

sagittariids
plural of sagittariid

sakeret
A male saker (species of falcon).

sakerets
plural of sakeret

sakret
Alternative form of sakeret.

sakrets
plural of sakret

salamandrid
Any animal of the family Salamandridae.

salamandrids
plural of salamandrid

salmonet
A young or small salmon; a samlet.

salmonets
plural of salmonet

salpingid
Any beetle in the family Salpingidae.

salpingids
plural of salpingid

samlet
A young salmon.

samlets
plural of samlet

samothere
Any extinct giraffid of the genus †Samotherium.

samotheres
plural of samothere

sandflea
Any insect of the species of flying, biting, blood-sucking two-winged flies encountered in sandy areas.
One of the Talitridae family of marine amphipod crustaceans.

sandfleas
plural of sandflea

sandownid
Any extinct turtle of the family †Sandownidae

sandownids
plural of sandownid

sapphirinid
Any copepod in the family Sapphirinidae.

sapphirinids
plural of sapphirinid

sapromyzid
Any fly in the family Sapromyzidae, a synonym of the Lauxaniidae.

sapromyzids
plural of sapromyzid

sapygid
Any wasp in the family Sapygidae.

sapygids
plural of sapygid

sarcophagan
Any fly of the genus Sarcophaga.

sarcophagans
plural of sarcophagan

sarcophagid
Any fly in the family Sarcophagidae, the flesh flies.

sarcophagids
plural of sarcophagid

satinbird
Any passerine bird of the family Cnemophilidae.

saturniid
Any moth of the family Saturniidae

saturniids
plural of saturniid

satyrid
Any butterfly of the nymphalid subfamily Satyrinae, formerly the family Satyridae.

satyrids
plural of satyrid

satyrine
Any butterfly of the subfamily Satyrinae

satyrines
plural of satyrine

saun
A male elephant that is not part of a herd; a rogue.

sauns
plural of saun

saurel
Any carangoid fish of the genus Trachurus, especially Trachurus trachurus, of Europe and America, and Trachurus picturatus of California; the skipjack, scad or horse mackerel.

saurichthyid
Any extinct fish in the family Saurichthyidae.

saurichthyids
plural of saurichthyid

saurichthyiform
Any extinct fish of the order Saurichthyiformes

saurichthyiforms
plural of saurichthyiform

saurosphargid
Any extinct reptile of the family †Saurosphargidae

saurosphargids
plural of saurosphargid

scallopwing
A butterfly of the genus Staphylus.

scallopwings
plural of scallopwing

scaphite
An extinct ammonoid of the genus Scaphites.

scarab
A beetle of the species Scarabaeus sacer, sacred to the ancient Egyptians.
Any species of beetle belonging to the family Scarabaeidae.
A symbol, seal, amulet, or gem fashioned to resemble the sacred beetle.

scarabaeid
Any beetle of the family Scarabaeidae (which includes stag- and dung-beetles).