Pseudoceros bicolor Verrill 1901

(Fig. 5)

Material examined. Two specimens (details in Table 1). One imature specimen (MNRJ-PLAT 35, 12 mm x 9 mm) as sagittal sections of reproductive structures (12 slides). Collected 30.12.2008 at Ilha do Papagaio, Cabo Frio, Brazil (22°53'53.21"S, 41°58'59.40"W). One imature specimen (MNRJ-PLAT 36, 12 mm x 8 mm) preserved in 70% ethanol. Collected 0 6.02.2009 at Praia das Conchas, Cabo Frio, Brazil (22°52'33.05"S, 41°58'39.27"W).

Distribution. Described from Birds Islands, Bermuda (type locality; Verrill 1901), reported from Curaçao (Marcus & Marcus 1968), Caribbean coast of Colombia (Quiroga et al. 2004b), Florida, Virgin Islands, Jamaica, Belize, Honduras and Caribbean coast of Panama (Rawlinson 2008), Brazil (Bahia & Padula 2009). Specimens herein studied were found under rubbles in the intertidal and sublittoral zones.

Diagnosis. Dorsal coloration from yellow to dark brown, white spots present; white marginal band with greyish black transversal stripes; bright yellow to greenish marginal line sometimes present.

Taxonomic remarks. Pseudoceros bicolor, described without histological sections (Verrill 1901), was amended by Litvaitis et al. (2010). These authors also studied the P. bi co l o r complex through a molecular approach. It was observed that specimens treated as a single species in papers such as Rawlinson (2008) and Bahia & Padula (2009) belong, in fact, to two distinct species with similar coloration pattern. The other species included in this complex is Pseudoceros rawlinsonae Bolaños, Quiroga & Litvaitis, 2007 . We separated specimens in the P. bicolor complex by considering P. b i c o l o r the ones without marginal line or with a thin line bright yellow to greenish at the worm margin, as indicated by Litvaitis et al. (2010). Our immature specimens were of a smaller size (12 mm x 9 mm) than originally described (30 mm x 15 mm), but they agree with features reported in the original description and recent amend (Litvaitis et al. 2010).