Gbroidea, Lowry & Azman, 2008

Lowry, J. K. & Azman, B. A. R., 2008, A new genus and species of cyproideid amphipod associated with unstalked crinoids on the Great Barrier Reef, Australia, Zootaxa 1760 (1), pp. 59-68 : 61

Gbroidea gen. nov.

Type species. Gbroidea dingaalana sp. nov., present designation. Included species. G. dingaalana sp. nov.

Etymology. “ Gbroidea ” is based on the initials of the Great Barrier Reef combined with the ending from some other cyproideid genera.

Diagnosis. Head lateral cephalic lobe narrowly rounded apically. Head rostrum small to medium in size. Antenna 1 accessory flagellum present. Antenna 2 slender. Mandible molar absent; palp well developed. Maxilla 1 palp 1-articlulate. Maxilliped outer plate reaching end of palp article 1. Gnathopod 1 simple; carpal lobe present, extending slightly along propodus posterior margin; propodus subrectangular; dactylus inner margin multispinous. Gnathopod 2 nearly simple; carpal lobe extending slightly along propodus posterior margin; dactylus, inner margin with 1 spine. Pereopod 5 basis rectolinear. Pereopod 6 basis rectolinear. Pereopod 7 basis expanded, subovate. Pleonite 3 without dorsodistal process. Epimeron 3 posteroventral corner broadly rounded. Urosomite 1 elongate, without dorsal keel. Urosomite 3 not projecting over telson . Uropod 2 very long, reaching beyond apex of uropod 3. Telson laminar, shorter than apex of uropod 3 rami.

Remarks. Genera in the Cyproideidae are diagnosed by a set of discrete characters based on the gnathopods, the basis of pereopods 5–7 and the urosomites. Within this set Gbroidea is highly distinctive. Considering the simple first and second gnathopods, Gbroidea is most similar to Peltopes . Considering the rectolinear basis on pereopods 5 and 6 and expanded, subovate basis of pereopod 7, Gbroidea is most similar to Cyproidea and Mokuoloe . The elongate urosomite 1 without a dorsal keel is unique to Gbroidea . Only Cyproidea and Gbroidea have the molar vestigial or absent.