Praedatrypaea, 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 : 97

Praedatrypaea gen. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:CDBA883E-288C-

4CDA-80F4-1BEE665FA3D0

Type species. Callianassa praedatrix De Man, 1905 , by present designation.

Diagnosis. Rostrum acute, anteriorly directed, as long as eyestalks. Pleomere 1 tergite fused, divided into 2 sections by transverse step. Pleomere 6 with sublateral ventral sharp ridge, flared posteriorly. Antennular peduncle exceeded by all or most of antennal peduncular article 5; articles 2 and 3 with single lateral row of 6–10 well-spaced long setae along lower margin. Antennal scaphocerite simple, longer than wide, acute. Maxilliped 3 merus wider at ischium-merus suture than long, with distal spine on distal free margin. Male major cheliped merus with blade dentate over lower margin, widest proximally. Pereopod 3 propodus oval, lower margin slightly convex, leading to narrow sharply rounded proximal lobe. Uropodal endopod ovoid, usually longer than wide, anterior margin straight or slightly convex, posterodistal margin evenly convex, with spiniform setae near anterior and distal margins. Uropodal exopod about 1.5–1.8 times as long as wide, 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 anterolateral lobe prominent, defined posteriorly by clear unchitinised region; truncate or slightly convex between posterolateral angles, or slightly concave, posterior margin sometimes with medial spine.

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

Remarks. The hooked spine on the distal margin of the merus of maxilliped 3 immediately defines Praedatrypaea . The genus is also unusual in that the proximolateral lobes at the base of the telson are prominent, especially ventrally, and are defined by a weakly chitinised suture dorsally and laterally. In other genera, these lobes may be evident and defined at most by a narrow slit.