Spinicallianassa, 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 : 99-100

Spinicallianassa gen. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:DCD1DFBE-9DFF-

481E-89CA-483A0AC6DDD8

Type species. Cheramus spinicauda Komai, Maenosono and Fujita, 2014 , by present designation.

Diagnosis. Hermaphrodite. Rostrum acute, anteriorly directed, as long as eyestalks. Pleomere 1 tergite undivided or with weak transverse step. Pleomere 6 with or without sublateral ventral sharp ridge, flared posteriorly. Antennular peduncle 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. Mandibular molar calcified, swollen projection without sharp edge, incisor with few teeth. Maxilliped 3 merus wider at ischium-merus suture than long. Male major cheliped merus with oblique spine one third to half-way along lower margin; dactylus with dense setae along upper margin. 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. 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, or on rib. 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 about as wide as long, tapering from anterolateral lobe; anterolateral lobe obsolete, undefined; transverse ridge sometimes with spiniform setae; posterior margin slightly concave, sometimes with medial spine.

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

Remarks. Species of Spinicallianassa have dense setae on the upper margin of the dactylus of the male major cheliped, approaching that of Paratrypaea but differing from this genus in many ways, notably having a small meral spine on the major cheliped rather than a prominent toothed blade. The row of short spiniform setae along the posterior margin of the telson may be characteristic of this genus only. Spinicallianassa shares with Aqaballianassa and Rayllianassa a dominating calcified mandibular molar without a sharp edge and an incisor without teeth.