A new classification of Callianassidae and related families (Crustacea: Decapoda: Axiidea) derived from a molecular phylogeny with morphological support Author Poore, Gary C. B. Author Dworschak, Peter C. Author Robles, Rafael Author Mantelatto, Fernando L. Author Felder, Darryl L. text Memoirs of Museum Victoria 2019 Mem. Mus. Vic. 2019-12-31 78 73 146 http://dx.doi.org/10.24199/j.mmv.2019.78.05 journal article 10.24199/j.mmv.2019.78.05 1447-2554 12214175 urn:lsid:zoobank.org:pub:263C1363-0ADA-4972-9224-AC690A1FD238 Cheramoides Sakai, 2011 Cheramoides Sakai, 2011: 362 . Cheramus .— Sakai, 2011: 363–365 (partim). Type species . Callianassa marginata Rathbun, 1901 , by original designation and monotypy. 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. Cornea with scattered reduced pigmentation. 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. Maxilliped 3 merus almost rectangular, distally truncate with squarish angle between distal and lower margins, longer than wide at ischium-merus suture; crista dentata a prominent toothed ridge extending beyond proximal margin of merus. Male major cheliped merus without prominent hook or spine on lower margin . Minor cheliped slender, narrower than major cheliped, with attenuated curved dactylus, longer than palm. Pereopod 3 propodus oval, lower margin slightly convex, leading to narrow sharply rounded 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 spiniform setae on rib. Uropodal exopod twice 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 obsolete, undefined; slightly concave, sometimes with medial spine. Remarks . Cheramoides is unique in that the uropodal exopod is twice as long as wide and much longer than the endopod. The maxilliped 3 merus is rectangular, distally truncate with a squarish angle between the distal and lower margins. Only C. oblonga from West Africa and C. brachytelson from the Andaman Sea are similar to the type species from the Caribbean deep sea.