Abstract
The Brazilian Archipelago of Fernando de Noronha lies off Cape Sao Roque, State of Rio Grande do Norte, about 195 nautical miles offshore. Only a few faunistic lists of this tropical archipelago have been published, and only four species of Gastropoda Opisthobranchia were cited. In this paper two species of Opisthobranchia Nudibranchia are recorded from this Archipelago. Dendrodoris senegalensis Bouchet 1975, known from Cape Verde and Senegal, amplifies its extension range toward the Western Atlantic. The brazilian specimens differ from the African specimens, in the presence of a completely white branchial tuft. Phidiana riosi sp nov clearly differs from other co-generic species in its colour pattern, having a red ground colour, with numerous white spots scattered on the dorsum. The rhinophores are orange and the cerata white with the cnidosac orange. Internally, this species has jaws with a single row of denticles, and the radular teeth have a central cusp with 7-8 denticles each side. The penis is armed with a black spine and the seminal receptacle connects with two independent ducts, the oviduct and the vaginal duct. Both species are compared with other similar taxa.
Highlights
The Brazilian Archipelago of Fernando de Noronha lies off Cape Sao Roque, State of Rio
Remarks: This species belongs to the genus Phidiana because it has long oral tentacles, the rhinophores are lamellate, the foot is anteriorly rounded, all the ceratal clusters are disposed in oblique rows, the jaws have a masticatory border with a row of denticles, the radular teeth are provided with lateral denticles on a central cusp and the penis is armed with a spine
One species of Phidiana has been described from Brazilian coasts, P. lynceus Bergh, 1867, which differs clearly from our specimens in the colour pattern; P. lynceus has a white line running mid-dorsally which branches up the basal parts of the oral tentacles, and orange bands on the rhinophores and oral tentacles
Summary
The Brazilian Archipelago of Fernando de Noronha lies off Cape Sao Roque, State of RioGrande do Norte, about 195 nautical miles offshore (Fig. 1). The masticatory border has a single row with 17 rounded denticles in a specimen of 17 mm in length
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