Cambeva duplimaculata

description

(Figs 7, 11 G, 12 G, 13 G; Table 7) urn: lsid: zoobank. org: act: 17 CCE 793 - 8 B 84 - 41 C 6 - B 304 - CD 44 C 46747 FE

Field inventory reveals high diversity of new species of mountain catfishes, genus Cambeva Katz, Barbosa, Mattos & Costa, 2018 (Siluriformes: Trichomycteridae), in south-eastern Serra Geral, southern Brazil

description

DESCRIPTION General morphology Morphometric data in Table 7. Body moderately slender, subcylindrical anteriorly to compressed posteriorly. Greatest body depth in area just anterior to pelvic-fin base. Dorsal and ventral profiles of head and trunk slightly convex, approximately straight on caudal peduncle. Skin papillae minute. Anus and urogenital papilla in vertical through anterior third of dorsalfin base. Head trapezoidal in dorsal view, anterior profile of snout convex. Eye small, dorsally positioned in anterior half of head. Posterior nostril located nearer anterior nostril than orbital rim. Tip of maxillary barbel reaching middle of interopercular patch of odontodes; tip of rictal and nasal barbels reaching anterior portion of interopercular patch of odontodes. Mouth subterminal. Jaw teeth pointed, slightly curved, irregularly arranged, 38 - 41 in premaxilla, 35 - 39 in dentary. Branchial membrane attached to isthmus only at its anterior point. Branchiostegal rays 9. Cranial fontanels present, posterior fontanel long, anteriorly extending between frontals to reach transverse line close to lateral sphenotic process. Dorsal and anal fins subtriangular, distal margin slightly con

Field inventory reveals high diversity of new species of mountain catfishes, genus Cambeva Katz, Barbosa, Mattos & Costa, 2018 (Siluriformes: Trichomycteridae), in south-eastern Serra Geral, southern Brazil

diagnosis

DIAGNOSIS. — Cambeva duplimaculata n. sp. is distinguished from all other species of the C. tropeira complex in having more dorsal procurrent caudal-fin rays (16 or 17, vs 12 - 15) and a colour pattern in adult specimens (above about 50 mm SL) consisting of flank with rounded black spots arranged in three irregular longitudinal rows, overlapped by a high concentration of minute dark brown spots that are placed at a more superficial skin layer (Fig. 7; vs never a similar colour pattern, Figs 8 - 10; see also Ferrer & Malabarba 2011: fig. 1). Also distinguished from C. longipalata n. sp. in having fewer vertebrae (39 or 40, vs 41 or 42), the dorsal-fin origin in vertical through centrum of 20 th or 21 st vertebrae (vs 23 rd or 24 th) and the anal-origin in vertical through centrum of 24 th or 25 th vertebrae (vs 26 th), and a wider body (body width 10.8 - 11.8 % SL, vs 8.0 - 9.7 % SL); from C. notabilis n. sp. in having a shorter pelvic fin (pelvic-fin length 7.0 - 8.6 % SL, vs 9.0 - 10.4 % SL); from C. tropeira in having a well-developed pelvic fin (vs pelvic fin absent); from C. urubici n. sp. in having fewer teeth on premaxilla (38 - 41, vs 46 - 51) and dentary (35 - 39, vs 46 - 5

Field inventory reveals high diversity of new species of mountain catfishes, genus Cambeva Katz, Barbosa, Mattos & Costa, 2018 (Siluriformes: Trichomycteridae), in south-eastern Serra Geral, southern Brazil

distribution

DISTRIBUTION. — Cambeva duplimaculata n. sp. occurs in the western open plateau. It is only known from two localities in the upper Rio Pelotas drainage, upper Rio Uruguai basin, in altitudes between about 1190 and 1250 m asl (Fig. 14).

Field inventory reveals high diversity of new species of mountain catfishes, genus Cambeva Katz, Barbosa, Mattos & Costa, 2018 (Siluriformes: Trichomycteridae), in south-eastern Serra Geral, southern Brazil