Trindade Scaled-Blenny

description

Description: Proportional measurements and counts in Guimarães et al., (2010). Complementary description based on holotype, two paratypes and 64 non-type specimens. Body elongated. Head moderate, snout pointed, forehead steep; eye 25 – 30 % in head length; upper lip separated from snout by deep groove; jaws subequal with about 11 pairs of pointed, slightly curved teeth; a crescent patch of villiform teeth on vomer; palatine toothless; maxillary barely reaching orbit; gill rakers on first arch 3 – 4 + 7 – 8; nasal cirrus simple or bifid (rarely triple or absent), arising from posterior border of short tube of anterior nostril and not reaching to posterior nostril when depressed; supra orbital cirri branches 3 (rarely 2 or 4) over each eye, its length varies from smaller to larger than half orbit diameter; nuchal cirri 6 – 8 (rarely 9) on each comb, paired or with one cirrus less, 13 – 18 in total, the longest reaching beyond dorsal-fin origin; space between nuchal cirri combs contained 2 – 3 times in comb´s base. One pore from preopercular canal onto opercle, rarely absent. Pores on ventral side of head: 3 – 4 mental, 1 – 2 symphysial and 4 – 6 interopercular. Dorsal fin continuous,

Review of the genus Malacoctenus (Actinopterygii: Labrisomidae) from the Southwestern Atlantic, with description of two new species

description

Portuguese (Brazilian) Name: Macaquinho de Trindade (Figure 6 - A)

Review of the genus Malacoctenus (Actinopterygii: Labrisomidae) from the Southwestern Atlantic, with description of two new species

diagnosis

Diagnosis. Malacoctenus brunoi can be distinguished from its southwestern Atlantic congeners by the following combination of characters: body elongated (depth 19 – 22 % SL versus 22 – 26 % SL in M. lianae sp. n. and M. zaluari sp. n., and 24 – 28 % SL in M. delalandii), lateral line scales 60 – 66 (versus 51 – 53 in M. zaluari, 54 – 68 in M. lianae, and 48 – 56 in M. delalandii), and the presence of two longitudinal rows of dark brown spots aligned on sides of body (versus presence of dark, triangular-shaped, saddle-like bars on body in M. lianae sp. n. and M. zaluari sp. n. and presence of irregular saddle-like bars in M. delalandii).

Review of the genus Malacoctenus (Actinopterygii: Labrisomidae) from the Southwestern Atlantic, with description of two new species

description

Description: Non-segmented dorsal-fin rays 20; segmented dorsal-fin rays 11 – 13 (12); anal-fin spines two; segmented anal-fin rays 20 – 22 (21); segmented caudal-fin rays 13; total pectoral-fin rays 28 – 29 (28); pelvic fins I + 3; lateral line scales 61 – 66 (63); space between first dorsal-fin spine and nuchal cirri bases scaleless; prepectoral area with one or two rows of scales extending to level of first two lowermost pectoralfin rays; total nasal cirri 4 – 5 (4); total supraorbital cirri 6; total nuchal cirri 14 – 17 (15); branchiostegal rays 6; vertebrae 38 (11 + 27). Body elongated, depth of body 19 to 22 % SL in specimens larger than 25 mm SL, head length 28 to 31 % SL; space between nuchal cirri bases averaging 31 to 46 % of length of a single base; snout length 7 to 9 % SL; bony orbital diameter 7 to 9 % SL; length of first dorsal-fin spine 8 to 10 % SL. Color pattern: Body light brown, with two longitudinal rows of dark-brown spots; one almost solid, with spots strongly coalesced, extending on dorsal half of body from immediately behind orbit to end of caudal-fin peduncle, the other, with spots less coalesced, extending on ventral half of body from snout tip (snout spo

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