Carpias Richardson, 1902

Doti, Brenda Lía & Wilson, George D. F., 2010, The genera Carpias Richardson, Ianiropsis Sars and Janaira Moreira & Pires (Isopoda: Asellota: Janiridae) from Australia, with description of three new species, Zootaxa 2625, pp. 1-39 : 3-4

Carpias Richardson, 1902

Carpias Richardson, 1902: 294 .— Bowman & Morris, 1979: 650; Wilson & Wägele, 1994: 695. Bagatus Nobili, 1906: 268 .— Nobili, 1907: 42; Pires, 1980: 96.

Janatus Carvacho, 1983: 289 (junior synonym by Wilson & Wägele, 1994).

Type species. C. bermudensis Richardson, 1902 , by original designation.

Species included. C. algicola ( Miller, 1941) ; C. asterophilus Pires, 1995 ; C. bermudensis Richardson, 1902 ; C. brachydactylus ( Pires, 1982) ; C. brucei Monod, 1974 ; C. crosslandi ( Stebbing, 1910) ; C. deodatus Müller, 1992 ; C. floridensis Menzies & Kruczynski, 1983 ; C. galloprovincialis ( Amar, 1950) ; C. harrietae Pires, 1981 ; C. ichthyoxenos ( Monod, 1961) ; C. longidactylus ( Nordenstam, 1946) ; C. longimanus ( Pillai, 1954) (junior synonym of C. algicola ); C. minutus ( Richardson, 1902) ; C. montaguensis sp. nov.; C. mossambica Kensley & Schotte, 2002 ; C. nana ( Stebbing, 1905) ; C. nereus ( Pires, 1982) ; C. parvus ( Omer-Cooper, 1921) ; C. platydactylus ( Nobili, 1906) ; C. punctatus ( Kensley, 1984) ; C. serricaudus ( Menzies & Glynn, 1968) ; C. stebbingi ( Monod, 1933) ; C. stylodactylus ( Nobili, 1906) ; C. triocellatus ( Müller, 1992) ; C. triton ( Pires, 1982) ; C. villalobosi ( Carvacho, 1983) .

Diagnosis. Eyes dorsolateral, extending to lateral margin. Maxilliped endite with 2 receptaculi. Pereopod I sexually dimorphic, carpus distinctly different between males and females. Pereopod I of adult (terminal) male ischium not elongate, near length of ischium on posterior pereopods (not recorded for most species); merus elongate, longer than merus on posterior pereopods; carpus carposubchelate, robust setae absent but with strong flattened spines on ventral margin; propodus ventral margin without robust setae, dactylus often reduced without claws. Pereopods II–VII not sexually dimorphic. Pleopod I of adult male medial lobe distal margin convex. Pleopod II of adult male stylet never coiled, shorter than protopod (except in C. harrietae ). Pleopod III endopod distal margin with 3 (rarely 4) plumose setae; exopod uniarticulate, distally rounded with 1 simple seta. Uropod rami crossectional shape oval.

Distribution. Cosmopolitan, tropical and subtropical coastal waters.

Remarks. The monotypic genus Rostrobagatus Müller, 1993 is similar to Carpias because of the sexually dimorphic pereopod I. The main difference between these two genera is the presence of rostrum in Rostrobagatus . Among the Janiridae , some genera such as Iathrippa and Janiralata , show variation in the development of the rostrum. Nevertheless, minor differences support maintaining Rostrobagatus as a separate genus. These differences are: tergites of pereonites 2–4 projecting anteriorly, with linear lateral margins; coxa of pereopod I triangular projecting anteriorly; pereopods II–VII with accessory third claw absent.