Paramoguai, Ahyong, Shane T., 2014

Ahyong, Shane T., 2014, Paramoguai kavieng, a new genus and species of camptandriid crab from Papua New Guinea (Crustacea: Brachyura), Zootaxa 3856 (4), pp. 578-584 : 578-579

Paramoguai gen. nov.

Diagnosis. Carapace subovate to pyriform, longer than wide, widest at branchial margins; lateral angles of posterior margin with prominent blunt projection; surface with scattered groups of short, dark, red-brown setae; mesogastric, cardiac, and intestinal regions each with prominent, upraised median protuberances. Front weakly bilobed, width about one-third fronto-orbital width. Suborbital margin well-developed, together with infraorbital margin forming shallow concavity (“cup”) on anterior surface. Maxilliped 3 rectangular, ischiomerus immovably fused, demarcation indicated only mesially by short suture; without median hiatus between inner margins when closed. Buccal margin of epistome bilobed, medially emarginated. Chelipeds monomorphic, more slender than walking legs, fingers without teeth on occlusal margins. Gonopod 1 strongly geniculate, deeply bifurcated forming two long branches. Abdominal somites 2–5 fused in males, 3–5 fused in females; somite 5 in males strongly constricted proximally, partially exposing gonopod 1. Gonopod 1 strongly geniculate, distal recurved portion deeply bifurcated into 2 slender branches.

Species included. Paramoguai kavieng sp. nov. (type species); Paramoguai pyriforme ( Naruse, 2005) comb. nov.

Etymology. The name is a combination of the Greek prefix para - and generic name Moguai alluding to the similarity of the two genera. Gender: neuter.

Remarks. Paramoguai gen. nov. belongs to the Camptandrium -like group of genera, united by a constricted male abdomen that partially exposes gonopod 1 and the markedly elongate branches of the bifurcated portion of gonopod 1 ( Manning & Holthuis 1981; Tan & Ng 1999). Of these genera, Paramoguai resembles Moguai Tan & Ng, 1999 , sharing a proportionally elongate carapace and similar dorsal ornamentation (including a pair of posterolateral projections; “prongs” of Tan & Ng 1999), fusion of abdominal somites 2–5 in males and 3–5 in females, similar orbital structure with a suborbital “cup”, and monomorphic chelipeds. Paramoguai and Moguai are distinguished by the elongate carapace, which in all other camptandriids is as wide as or wider than long. Paramoguai differs from Moguai in having an immovably fused maxilliped 3 ischiomerus with evidence of separation only mesially (resembling the condition present in Camptandrium Stimpson, 1858 ), in having a proportionally narrower carapace front (about one-third versus one-half fronto-orbital width in Moguai ), in having the anterolateral margins of the carapace positioned slightly within the dorsal outline of the carapace, and in having a bilobed buccal margin of the epistome, which is distinctly medially emarginate rather than forming a prominent median tooth. This latter feature of the epistome margin, unique in the Camptandriidae , is evidence for the monophyly of Paramoguai .

Naruse (2005) described Moguai pyriforme on the basis of female specimens from the Ryukyu Islands, Japan, recognising that it differed from Moguai sensu stricto in having a narrower carapace front (about one-third frontoorbital width), a fused maxilliped 3 ischiomerus with only a short mesial suture, and anterolateral margins that lay within the dorsal outline of the carapace margins. His fig. 2B also indicates that the median buccal margin of the epistome is bilobed with a distinct median emargination. Kishino et al. (2014) provided a detailed supplemental account of M. pyriforme including male morphology. Moguai pyriforme clearly exhibits the diagnostic features of Paramoguai , to which it is herein transferred.