Paratrypaea Komai & Tachikawa, 2008

Dworschak, Peter C., 2012, On the identities of Callianassa bouvieri Nobili, 1904, C. maldivensis Borradaile, 1904, and C. gravieri Nobili, 1905 (Crustacea: Decapoda: Callianassidae): a morphometric approach, Zootaxa 3149, pp. 39-56 : 44-45

Paratrypaea Komai & Tachikawa, 2008

Type species. Callianassa (Trypaea) Bouvieri Nobili, 1904 by original designation. Gender: feminine [erroneously first masculine (under Type species), later feminine (under Etymology) in Komai & Tachikawa, 2008: 36].

Included species. Paratrypaea bouvieri ( Nobili, 1904) , P. maldivensis ( Borradaile, 1904) n. comb. [= P. rectangularis Ngoc-Ho, 1991], Paratrypaea sp. (Hawaii)

Diagnosis (amended from Komai & Tachikawa, 2008). Carapace with dorsal oval; rostrum conspicuous, spiniform; linea thalassinica distinct. Second somite of pleon slightly shorter than sixth somite; third to fifth pleonal somites each with lateral tufts of setae. Telson subquadrate. Ocular peduncle short, flattened dorsoventrally; cornea disk-shaped, subterminal, submedial. Antennular peduncle longer than antennal peduncle. Third maxilliped with merus-ischium operculiform; ischium with crista dentata consisting of row of small spines; propodus and dactylus slender, the latter digitiform; exopod absent. Exopod present on first and second maxillipeds. Single arthrobranch above base of second maxilliped, paired arthrobranchs above base of third maxilliped to fifth pereopods. Chelipeds (first pereopods) greatly dissimilar at least in males, major with broad, marginally denticulate projection on ventral margin or with row of sharp teeth at least in males. Propodus of third pereopod oval, no heel. Propodus of fourth pereopod moderately broad. Fifth pereopod chelate. Male lacking first and second pleopods. Third to fifth pleopods biramous, foliaceus, appendix interna small, stubby, projecting from mesial margin of endopod. Uropodal exopod with dorsal plate bearing thick assemblage of stiff setae posteriorly; endopod also with small dorsal plate.

Remarks. Recently, Sakai (2011) synonymised the genera Paratrypaea and Pestarella Ngoc-Ho, 2003 with Gilvossius Manning & Felder, 1992 on the basis of the absence of male pleopods 1 and 2. This opinion is not followed here as many other morphological features distinguish the genera. A molecular phylogenetic study by Felder & Robles (2009) shows support for earlier generic assignments within the Callianassidae which formed distinct clades, with Paratrypaea on the base of the subfamily Callianassinae , far away from the type species of Gilvossius , G. setimanus ( DeKay, 1844) , which grouped close to Pestarella tyrrhena ( Petagna, 1792) in the same subfamily.