Paratrypaea Komai and Tachikawa, 2008

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 : 96-97

Paratrypaea Komai and Tachikawa, 2008

Paratrypaea Komai and Tachikawa, 2008: 36 .—Komai and Fujita, 2014: 5–6.

Gilvossius .— Sakai, 2011: 372–373 (partim).

Type species. Callianassa (Trypaea) bouvieri Nobili, 1904 , by original designation.

Diagnosis. Rostrum broadly or sharply triangular, almost or as long as eyestalks. Pleomere 1 tergite fused, divided into 2 sections by transverse step. Antennular peduncle length about 2.5–3 times the width of both eyestalks. Maxilliped 3 merus wider at ischium-merus suture than long. Male major cheliped merus with blade dentate over lower margin, widest proximally; 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; upper distal margin of propodus and dactylus with dense brush of setae. Pereopod 3 propodus rectangular, lower margin deeply convex, leading to broadly rounded free proximal lobe. Male pleopod 2 absent. Uropodal endopod ovoid, usually longer than wide, anterior margin straight or slightly convex, posterodistal margin evenly convex, with facial distal transverse row of short spiniform setae. Uropodal exopod distal margin differentiated from anterior margin, anterodistal corner rounded or right-angled. Telson longer than wide, tapering evenly from near base; anterolateral lobe defined posteriorly by short transverse slit; transverse ridge with only fine setae; truncate or slightly convex between posterolateral angles.

Remarks. Species of Paratrypaea are immediately recognisable by the dense brush of setae on the propodus and lateral dactylus of the major cheliped, and the merus of the male major cheliped having a dentate blade on its lower margin, rather than a hook as in many other genera.

Paratrypaea was synonymised with Gilvossius by Sakai (2011) because the two genera share the same type of male pleopods 1 and 2, but the two genera differ in many ways (Komai and Fujita, 2014). Gilvossius chichijimaensis Sakai, 2015 , was shown to be a junior synonym of Paratrypaea bouvieri (see Komai, 2017).