Genus Palaeastacus Bell, 1850

(Fig. 1G, H)

Palaeastacus Bell, 1850: 344 . — Zittel 1885: 695. — Beurlen 1928: 180. — Förster 1966: 126. — Taylor 1979: 26. — Aguirre-Urreta & Ramos 1981: 606. — Aguirre-Urreta 1989: 509. — Schweitzer & Feldmann 2001: 174. — Feldmann et al. 2015: 3. — Hyžný et al. 2015: 375.

Enoploclytia (Palaeastacus) – Mertin 1941: 161. — Glaessner 1969: 455.

TYPE SPECIES. — Astacus sussexiensis Mantell, 1824, by subsequent designation of Glaessner (1929).

EMENDED DIAGNOSIS. — Fusiform intercalated plate with tubercles; deep cervical groove, joined to dorsal margin and to antennal groove; short gastro-orbital groove originating as a slight median inflexion of cervical groove; postcervical and branchiocardiac grooves nearly parallel, both joined to hepatic groove; concavo-convex hepatic groove, joined to cervical groove; inferior groove convex posteriorly, joined to hepatic groove; longitudinal rows of sub-spiny tubercles in gastric region, diagonal rows of tubercles on cardiac region; massive chelate P1; P1 propodus short, thick, slightly globose, inner margin more compressed than outer margin, longitudinal rows of spiny tubercles on dorsal and ventral surfaces, inner margin bearing strong spines; P1 palm with narrow dactylar bulge; wide fingers, slightly longer than propodus, gradually narrowing to distal extremity; index with basally curved occlusal margin.