Filhollianassa, 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 : 93-94

Filhollianassa gen. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:9A34F27E-ABF5-

46ED-AFE8-BA399225F2C6

Type species. Callianassa filholi A. Milne-Edwards, 1878 , by present designation.

Diagnosis. Anterior carapace strongly domed, depressed over anterior quarter. Rostrum obsolete or obtusely triangular, flat, not reaching cornea. Pleomere 1 tergite undivided or with weak 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 prominent truncate hook armed with serrations along lower margin, excavate laterally at base; carpus and propodus flattened, upper and lower margins carinate, blade-like, submarginalmesialfaceespeciallyofcarpusdeeplyconcave; propodus distal margin with deep notch at base of fixed finger. 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 angles to straight anterior margin, with facial distal transverse row of short spiniform setae. Uropodal exopod 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 the name of the type species and Callianassa , type genus of the family.

Remarks. The two species of Filhollianassa from south-eastern Australia and New Zealand are immediately recognisable from the strongly domed anterior carapace and strongly inwardly curved carinate upper and lower margins of the carpus and propodus of the major chelipeds. The major cheliped of Trypaea australiensis , also in south-eastern Australia but ecologically separate, is similar but this species has a flat dorsum, much longer and more setose antennule, considerably expanded merus of maxilliped 3 and narrower uropodal endopod.