Cambeva orbitofrontalis

description

(Figs 4, 11 D, 12 D, 13 D; Table 4) urn: lsid: zoobank. org: act: 45 F 25566 - C 30 E- 43 A 4 - 8523 - F 77 BEC 7 A 5111

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 4. 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 dorsal-fin 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 portion of interopercular patch of odontodes; tip of rictal barbel reaching anterior part of interopercular patch of odontodes; tip of nasal barbel slightly posteriorly surpassing orbit. Mouth subterminal. Jaw teeth slightly pointed to incisiform in outer areas, slightly curved, irregularly arranged, 36 - 38 in premaxilla, 31 - 34 in dentary. Branchial membrane attached to isthmus only at its anterior point. Branchiostegal rays 7. Cranial fontanels present, posterior fontanel long, anteriorly extending between frontals to reach transverse line close

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 orbitofrontalis n. sp. differs from other species of the C. botuvera complex in having more ribs (16, vs 12 or 13 in C. botuvera and 14 in C. panthera n. sp.), seven branchiostegal rays (vs 8), fewer teeth in the premaxilla (36 - 38, vs 40 - 42 in C. botuvera and 44 - 46 in C. panthera n. sp.) and dentary (31 - 34, vs 40 - 42 in C. botuvera and 38 - 43 in C. panthera n. sp.), a rounded caudal fin (vs subtruncate) and a long sesamoid supraorbital, longer than the autopalatine (vs shorter). Also distinguished from C. botuvera in having a shorter pectoral fin (pectoral-fin length 7.6 - 9.1 % SL, vs 12.1 - 15.1 % SL) and a shorter space between orbit and anterior nostril (pre-orbital length 10.7 - 12.7 % of the head length, vs 13.6 - 16.7 %); and from C. panthera n. sp. in having fewer dorsal procurrent caudal-fin rays (18, vs 20 - 24), more vertebrae (39 - 40, vs 37), the dorsal-fin origin in a vertical through the centrum of the 21 st vertebra (vs 18 th or 19 th), more opercular (13 - 15, vs 10 or 11) and interopercular odontodes (30 - 35, vs 23 - 25), a shorter caudal fin (caudal-fin length 13.0 - 15.2 % SL, vs 17.8 - 20.2 % SL), and shorter pelvic-fins (pelvic-

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 orbitofrontalis n. sp. occurs in the eastern forested slope. It is found in the Rio Araranguá basin, in altitudes between about 130 and 390 m (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