Enoplocytia leachii, from here.
Belongs within: Reptantia.
Contains: Astacida, Homarida.

The Astacidea are a clade of decapod crustaceans including the clawed lobsters and crayfish, with most modern representatives having well-developed chelae on the first pereiopods.

Characters (from Amati et al. 2004): Cephalothorax subcylindrical; rostrum and abdomen well developed; frontal portion of carapace not fused with epistome; antennae with five-segmented stalk and scale; third maxilliped pediform; pereiopods chelate, subchelate, or pseudochelate; first pereiopod longest; abdominal pleura well developed; exopods of uropods with diaresis; genital openings coxal.

<==Astacidea [Astacura, Nephropoidea]
|  i. s.: Platychelidae BWW93
|           |–Platypleon nevadense Van Straelen 1936 BWW93
|           `–Platychela trauthi Glaessner 1931 BWW93
|         Viriliastacus AFZ04
|–+–+–Astacida AFZ04
|  |  `–Homarida DAS03
|  `–Thaumastochelida DAS03
|       |–Thaumastochelopsis Bruce 1988 TS03
|       |–Oncopareia Bosquet 1854 TS03
|       |    `–O. bredai TS03
|       `–Thaumastocheles Wood-Mason 1874 [Thaumastochelidae] TS03
|            |–T. dochmiodon Chan & de Saint Laurent 1999 DAS03
|            `–T. japonicus TS03
`–+–Glypheoidea AFZ04
|    |–Chimaerastacus Amati, Feldmann & Zonneveld 2004 [Chimaerastacidae] AFZ04
|    |    `–*C. pacifluvialis Amati, Feldmann & Zonneveld 2004 AFZ04
|    `–+–Neoglyphea inopinata Forest & de Saint Laurent 1975 AFZ04, DAS03
|       |–Glypheidae FGS04
|       |    |–Glyphea robusta AFZ04, P98
|       |    |–Protoclytiopsis antiqua Birshtein 1958 BWW93
|       |    `–Litogaster von Meyer 1847 [=Lithogaster (l. c.)] FGS04
|       |         `–L. turnbullensis AFZ04
|       `–Mecochiridae AFZ04
|            |  i. s.: ‘Upogebia’ clypeata BWW93
|            |–Mecochirus AFZ04
|            |–Meyeria M’Coy 1849 BWW93
|            `–Pseudoglyphea Oppel 1861 BWW93 [incl. Triasiglyphea van Straelen 1936 AFZ04]
|                 `–P. mulleri (van Straelen 1936) [=*Triasiglyphea mulleri] AFZ04
`–Erymoidea AFZ04
|–Clytiopsis [Clytiopsidae] AFZ04
|    `–C. argentoratensis Glaessner 1929 BWW93
`–+–Pemphicidae AFZ04
|    |–Pseudopemphix Wüst 1903 BWW93
|    |    `–P. albertii (von Meyer 1840) BWW93
|    `–Pemphix von Meyer 1840 FGS04
|         `–P. sueurii (Desmarest 1822) BWW93
`–Erymidae AFZ04
|  i. s.: Lissocardia von Meyer 1851 FGS04
|–Eryma von Meyer 1840 AFZ04, TS03
`–+–Phlyctisoma AFZ04
`–Enoplocytia McCoy 1849 AFZ04, E14
|–*E. leachii [=Astacus leachii] E14
|–E. terrareginae Etheridge 1914 E14
`–E. ventricosa E14

*Type species of generic name indicated


[AFZ04] Amati, L., R. M. Feldmann & J.-P. Zonneveld. 2004. A new family of Triassic lobsters (Decapoda: Astacidea) from British Columbia and its phylogenetic context. Journal of Paleontology 78 (1): 150–168.

[BWW93] Briggs, D. E. G., M. J. Weedon & M. A. Whyte. 1993. Arthropoda (Crustacea excluding Ostracoda). In: Benton, M. J. (ed.) The Fossil Record 2 pp. 321–342. Chapman & Hall: London.

[DAS03] Dixon, C. J., S. T. Ahyong & F. R. Schram. 2003. A new hypothesis of decapod phylogeny. Crustaceana 76: 935–975.

[E14] Etheridge, R., Jr. 1914. The genus Enoploclytia in the Cretaceous rocks of Queensland. Records of the Australian Museum 10 (9): 271–273, pls 23–24.

[FGS04] Feldmann, R. M., A. A. Garassino & C. E. Schweitzer. 2004. The presumed decapod, Palaeopemphix Gemmellaro, 1890, is a unique member of the Phyllocarida (Palaeopemphicida: Palaeopemphidae). Journal of Palaeontology 78: 340–348.

[P98] Prothero, D. R. 1998. Bringing Fossils to Life: An introduction to paleobiology. WCB McGraw-Hill: Boston.

[TS03] Tshudy, D., & U. Sorhannus. 2003. Hoploparia, the best-known fossil clawed lobster (family Nephropidae), is a “wastebasket” genus. Journal of Crustacean Biology 23 (3): 700–711.

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