05. Navanax gemmatus (Mörch, 1863) (Fig. 2E)

Material examined: Parrachos de Maracajaú, Maxaranguape, 17.V.2015, one specimen, 40 mm (body length), leg. M. Delgado (GEEFAA 1322) ; Praia de Santa Rita, Extremoz, 28.III.2009, one specimen, 40 mm (body length),leg. V. Padula (MZSP97068), 24.VI.2009, one specimen, 28 mm (body length),leg. M. Delgado (GEEFAA 319). Praia de Pirambúzios,Nísia Floresta, 14.IV.2010, one specimen, 20 mm (body length), leg. G.Grimaldi (GEEFAA 300), 29.I.2014, one specimen, 45 mm (body length), leg. T.Accioly (GEEFAA 328), 15.V.2014, one specimen, 30 mm (body length), phot. reg. T. Accioly .

Description: Elongated and cylindrical body. Predominant body color greenish-brown, with numerous dorsal, thin longitudinal lines beige color. Cephalic shield well elongated and rounded at the anterior end, well-developed retractable eyes, a pair of lateral lobes and a well-developed mouth structure. Lateral parapodia covering 80% of the dorsum, leaving a small part exposed. In the posterior region, terminal lobes divided into two semicircular flaps, forming a robust tail.

Geographic distribution: Western Atlantic: Antigua & Barbuda, Aruba Bahamas, Barbados, Belize, Bonaire, Chile, Colombia, Costa Rica, CuraÇao, Grenada, Guadeloupe, Honduras, Jamaica, Martinique, Mexico, St. Barthelemy / St. Bartholomew, St. Vicent & the Grenadines, USA, Venezuela, Virgin Islands, Brazil (Pernambuco, Rio de Janeiro, Rio Grande do Norte – present study, São Paulo) (Valdés et al., 2006; García et al., 2008; Rios, 2009;OrnelasGatdula et al., 2012).

Remarks: Our specimens were initially identified as Navanax aenigmaticus Bergh, 1893, however OrnelasGatdula et al. (2012) performed a phylogenetic analysis where they revealed a complex of three species under the name N. aenigmaticus . This species complex showed genetic and morphological differences between specimens from the eastern Pacific, western and eastern Atlantic. The species present in the western Atlantic is N. gemmatus .