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Tetrachela Temporal range: Late Triassic PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Decapoda
Suborder:	Pleocyemata
Superfamily:	Eryonoidea
Family:	†Tetrachelidae Beurlen, 1930
Genus:	†Tetrachela Reuss, 1858
Species:	†T. raiblana
Binomial name
†Tetrachela raiblana (Bronn, 1858)

Tetrachela raiblana is an extinct species of polychelid crustacean from the Late Triassic. It is the only species in the family Tetrachelidae. It is distinguished from most other polychelids, including all the extant Polychelidae, by the retention of the diaeresis (divisions) of the uropodal exopods.

References

1. Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109.
2. Shane T. Ahyong (2009). "The polychelidan lobsters: phylogeny and systematics (Polychelida: Polychelidae)". In Joel W. Martin; Keith A. Crandall; Darryl F. Felder (eds.). Decapod Crustacean Phylogenetics (PDF). Crustacean Issues 18. CRC Press. pp. 369–396. ISBN 978-1-4200-9258-5.

v t e Subgroups of order Decapoda
Kingdom: Animalia Phylum: Arthropoda Class: Malacostraca Subclass: Eumalacostraca Superorder: Eucarida
Dendrobranchiata	Penaeoidea Sergestoidea
Pleocyemata	Stenopodidea Stenopodidae Macromaxillocarididae Spongicolidae Procarididea Procarididae Caridea Alpheoidea Atyoidea Bresilioidea Campylonotoidea Crangonoidea Galatheacaridoidea Nematocarcinoidea Oplophoroidea Palaemonoidea Pandaloidea Pasiphaeoidea Physetocaridoidea Processoidea Psalidopodoidea Stylodactyloidea Reptantia Achelata Palinuridae (inc. Synaxidae) Scyllaridae †Cancrinidae †Tricarinidae? Polychelida †Coleiidae †Eryonidae †Palaeopentachelidae Polychelidae †Tetrachelidae Glypheidea Glypheoidea †Erymoidea Astacidea Astacoidea Enoplometopoidea Nephropoidea †Palaeopalaemonoidea Parastacoidea Axiidea Axiidae Callianassidae Callianideidae Ctenochelidae Gourretiidae Micheleidae Strahlaxiidae Gebiidea Axianassidae Laomediidae Thalassinidae Upogebiidae Anomura Aegloidea Chirostyloidea †Eocarcinoidea Galatheoidea Hippoidea Lomisoidea Paguroidea Brachyura see Brachyura

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