Tastrypaea, Poore & Dworschak & Robles & Mantelatto & Felder, 2019

Poore, Gary C. B., Dworschak, Peter C., Robles, Rafael, Mantelatto, Fernando L. & Felder, Darryl L., 2019, A new classification of Callianassidae and related families (Crustacea: Decapoda: Axiidea) derived from a molecular phylogeny with morphological support, Memoirs of Museum Victoria (Mem. Mus. Vic.) 78, pp. 73-146 : 100

Tastrypaea gen. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:B5299239-C36C-

4B78-8A7A-BB82710B67B5

Type species. Callianassa poorei Sakai, 1999 , herein designated.

Diagnosis. Rostrum obsolete or obtusely triangular, flat, not reaching cornea. Pleomere 1 tergite undivided or with weak transverse step. Maxilliped 3 merus wider at ischium-merus suture than long. Male major cheliped merus with 1 or 2 small teeth just before midpoint; carpus and propodus flattened, upper and lower margins carinate, blade-like, submarginal mesial face especially of carpus deeply concave; propodus distal margin with deep notch at base of fixed finger. Minor cheliped two-thirds width of major cheliped, both flattened. Pereopod 3 propodus rectangular, lower margin deeply convex, leading to broadly rounded free proximal lobe. Male pleopod 2 absent. Uropodal endopod asymmetrical, at least as wide as long, distal margin truncate-convex, at right anglestostraightanteriormargin, with facial distal transverse row of short spiniform setae. Uropodal exopod distal margin clearly differentiated from anterior margin, anterodistal corner right-angled, posterodistal margin with row of 6–8 long blade-like setae proximal to long setae on distal margin. Telson lateral margins convex.

Etymology. An alliteration of Tasmania, type locality of the type species, and Trypaea , a genus of the family.

Remarks. We have no molecular data to support this genus but Callianassa poorei displays several significant morphological differences from its nearest neighbours to justify a new genus ( Sakai, 1999b). Tastrypaea resembles species of Paratrypaea in having a well-developed transverse row of spiniform setae near the anterodistal angle of the uropodal endopod but differs in not having especially setose fingers on the major cheliped. The species also differs from Paratrypaea and from Arenallianassa arenosa , which has an obsolete row of spiniform setae on the uropodal endopod, in that the chelipeds are not extremely dissimilar, in not having a well-developed blade on the major cheliped, the uropodal endopod being asymmetrical, as wide as long, with its distal margin truncate-convex, at right angles to the straight anterior margin (rather than ovoid and longer than wide) and the uropodal exopod having a row of long blade-like setae proximal to long setae on the distal margin (rather than having densely setose margins). Tastrypaea differs from Filhollianassa , its sister taxon in Robles et al. (in press), in not having a depressed anterior carapace and chelipeds without prominent marginal crests.