Malacoctenus brunoi sp. n. (Blennioidei: Labrisomidae), a new scaled-blenny from Trindade Island, off Brazil

摘要

Malacoctenus brunoi n. sp., a scaled blenny endemic to Trindade Island, is distinguished from its southwest Atlantic congeners by the combination of a higher number of lateral-line scales (typically 62-66), a more elongated body (depth 19-22 % SL), and the presence of two longitudinal series of dark brown spots alongside the body. Malacoctenus Gill comprises 16 valid species of small reef-dwelling fishes distributed along the tropical and sub-tropical waters of the Western Atlantic and Eastern Pacific (Greenfield and Johnson, 1981; Springer, 1959; 1995; Springer and Gomon, 1975). Two species are currently recognized in the southwestern Atlantic: Malacoctenus triangulatus Springer, recorded from Atol das Rocas (Nunan, 1992), Fernando de Noronha Archipelago (Springer & Gomon, 1975; Mendes, 2006), St. Paul's Rocks (Lubbock & Edwards, 1981; Feitoza et ah, 2003), Parcel de Manoel Luíz (Rocha & Rosa, 2001) and along the coast of Brazil from Paraiba (Feitoza et al., 2005) southwards to Rio de Janeiro (Bacellar, 1997); and Malacoctenus delalandei Quoy and Gaimard, recorded from along the Brazilian coast from Rio Grande do Norte (Springer, 1958) south to Santa Catarina (Lucena & Lucena, 1982). Nunan (1992), Guimaráes et al. (2001) and Gasparini (2004) also reported a third form from Trindade Island, which is herein described as a new species.