Darryllianassa, Poore, 2023

Poore, Gary C. B., 2023, New records, one new genus and 21 new species of Callianassidae (Crustacea, Axiidea) from the Indo-West Pacific, Memoirs of Museum Victoria 82, pp. 167-255 : 197

Darryllianassa gen. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:242F9105-478D-

4639-BA51-F612343036D1

Diagnosis. Rostrum acute. Pleomere 1 tergite undivided or with weak transverse step. Cornea well-defined, pigmented, eyestalk distal lobes blunt, oriented vertically. Antennular peduncle length about twice width of both eyestalks, little shorter than antennal peduncle; articles 2 and 3 with single lateral row of few well-spaced long setae. Antennal scaphocerite simple, longer than wide, acute. Maxilliped 3 merus as long as wide at ischium-merus suture; crista dentata with proximal row of 5 spines and distal dentate blade; dactylus tapering, with scattered setae over upper margin, dense brush of short setae distally on lower margin. Female major cheliped merus with oblique spine halfway along lower margin; propodus distal margin and fixed finger having lateral and medial cutting edges separated by shallow groove and deep cavity at base (under dactylus). Minor and major chelipeds of female similar; minor cheliped merus lower margin with spine at or near midpoint; carpus upper margin longer than propodus. Pereopod 3 propodus elongate-oval, tapering, without proximal lobe on lower margin. Pleopods 3–5 appendices internae longer than broad, clearly emerging from margin of endopod. Uropodal endopod ovoid, longer than wide, anterior margin straight, posterodistal margin evenly convex, without facial setae. Uropodal exopod about 1.5 times as long as wide, distal margin poorly differentiated from anterior margin, anterodistal corner rounded, with wide elevated dorsal plate. Telson about as wide as long, tapering from anterolateral lobe; anterolateral lobe prominent, defined posteriorly by clear unchitinised region; transverse ridge with only fine setae.

Type species. Darryllianassa felderi sp. nov. (by present designation).

Etymology. For Darryl L. Felder, University of Louisiana at Lafayette, Lafayette, Louisiana, honouring his considerable contribution to callianassid taxonomy and ecology, by combining his given names with Callianassa .

Remarks. Darryllianassa is erected for a single species unique in the possession of two similar chelipeds, each with fingers longer than the palm and with a deep groove and basal cavity on the fixed finger. The cheliped merus lacks a proximal tooth. Pereopod 3 has an oval propodus without a strong “heel”, similar to that in Cheramus and Scallasis , but not as simple as in Lipkecallianassa Sakai, 2002 . Maxilliped 3 is relatively narrow (pediform) compared to many callianassid genera, in which it is operculiform. The male is unknown. DNA could not be retrieved from tissue samples so its molecular affinities could not be determined.