Sergio guassutinga (Rodrigues, 1971)

(Figs. 6, 7)

Callianassa (Callichirus) guassutinga Rodrigues 1971: 204, figs. 41–60. Sergio guassutinga .— Manning & Lemaitre 1994: 40.

Neocallichirus guassutingus .— Sakai 1999: 90 (part.?).

Neocallichirus maryae .— Pachelle et al. 2016: 30 (part.), fig. 21A, B [not N. maryae Karasawa, 2004].

Material examined. Brazil, Ceará: 1 male (cl 20.5 mm), MZUSP 32610, Icapuí, Praia de Tremembé, sand-mud flat, in burrow, suction pump, coll. P. Pachelle, 12.ii.2014.

Distribution. Western Atlantic: USA (Florida, Louisiana, Texas), Mexico (Tamaulipas), Brazil (Ceará, Paraíba, Pernambuco, Sergipe, Bahia, São Paulo) (Rodrigues & Shimizu 1998; present study). Sakai’s (1999, 2011) record from the eastern Pacific (Panama) requires confirmation.

Remarks. Sergio guassutinga is herewith recorded for the first time from Ceará, being previously known from several states along the eastern coast of Brazil, from Paraíba to São Paulo (Rodrigues & Shimizu 1998). The only other species of the genus Sergio Manning & Lemaitre, 1994 known to occur in Ceará is the closely related Sergio guara (Rodrigues, 1971) (Fig. 9), which differs from S. guassutinga by several features on the first chelipeds and telson (Rodrigues 1971). The two species may occur syntopically, for instance, on sand-mud flats at Icapuí.

In the field, S. guassutinga can be also confused with species of Neocallichirus, e.g. N. maryae and N. cacahuate (Pachelle et al. 2016) . However, S. guassutinga differs from both N. maryae and N. cacahuate by the shape and armature of the major first cheliped (cf. Figs. 1 C, 5A, 6C), the shape of the posterior margin of the telson (cf. Figs. 2 A, 4D, 7A) and the position and margin setation of the dorsal plate of the uropodal exopod (cf. Figs. 2 C, 4F, 7C).