(Fig. 1)
Typton prionurus Holthuis, 1951: 165, pl. 52, figs. a-l; Holthuis, 1952: 19; Bullis & Thompson, 1965: 8; Chace, 1972: 52; Abele & Kim, 1986: 17, 187, figs. a-c; Camp, 1998: 140; Coelho et al., 2006: 51; Duris et al., 2009: 1056; Santana-Moreno et al., 2013: 233, fig. 2L.
Material examined: 1 male (cl 2.7 mm), 1 ovigerous female (cl 2.8 mm), MZUSP 31143, Brazil, Bahia, Baía de Todos os Santos, Porto da Barra, sta. MT6 CA6, 13°00’05”S, 38°32’01”W, associated with Callyspongia sp., depth 4-6 m, coll. C. Menegola & L. Martins, 20.xi.2012.
Description: For original description and figures see Holthuis (1951); the male specimen from Bahia is illustrated in Fig. 1.
Distribution: Western Atlantic: USA (Florida), Mexico (Gulf of Mexico), Brazil (Pará?, Bahia) (Holthuis, 1951; Bullis & Thompson, 1965; Camp, 1998; Duris et al., 2009; Santana-Moreno et al., 2013; present study).
Remarks: The present material confirms the occurrence of Typton prionurus in the southwestern Atlantic (Brazil). The single previous record of T. prionurus from off Pará by Bullis & Thompson (1965) remains doubtful as it was listed as “ Typton prionurus Holthuis?”, with no further remarks, illustrations or indication of where the corresponding material was deposited. Bullis & Thompson’s (1965) record was apparently overlooked by Vieira et al. (2012), although it was listed in an earlier checklist of Coelho et al. (2006). We found no noticeable difference between the present material of T. prionurus (Fig. 1) and Holthuis’ (1951) description and figures. The species may be readily distinguished from its West Atlantic congeners by the serrate distolateral margin of the uropodal exopod (Fig. 1 m).