Chasmocranus brachynemus

discussion

Remarks. While searching the collection, we did not find the holotype, but a note among Godoy’s files indicating that the holotype was transferred from EEBP to the MHNP along with type specimens of other species. Thus, we concluded that someone must have taken it from MHNP. After some research, we discovered its whereabouts: the specimen was borrowed by a researcher at MZUSP, which continues to house it as of the publication of the present paper.

Notes on some type specimens of the Natural History Museum of Pirassununga São Paulo, Brazil

materials_examined

Holotype: EEBP 617, 128.3 mm SL (Figure 8): Brazil, S „ o Paulo, Pirassununga, Mogi-Guaçu River at Emas waterfall, tributary of Grande River, tributary of the Paraná River, ~ 21 ° 55 ′ 35 ″ S, 47 ° 22 ′ 3 ″ W, ~ 545 m asl, 24 Dec 1956.

Notes on some type specimens of the Natural History Museum of Pirassununga São Paulo, Brazil

description

(Figs. 1 – 3; Tab. 1) Chasmocranus brachynema Gomes, Schubart, 1958: 413 – 16, figs. 1 – 3 (original description; type-locality: rio Mogi-Guaçu, cachoeira de Emas, Piraçununga, São Paulo, Brazil; holotype: EEBP 617). — Schubart, 1964: 12, 18 (rio Mogi-Guaçu basin, collection of a new specimen EEBP 629, list of species). — Bockmann, Guazzelli, 2003: 411 (catalog, type information, distribution). — MMA, 2004: anexo 1 (list of endangered species). — Langeani et al., 2007: 187 (upper rio Paraná basin, list of species). — Meschiatti, Arcifa, 2009: 136, 140 (Mogi-Guaçu basin, list of species). — Oyakawa et al., 2009: 353, 381, 642 (list of endangered species of State of São Paulo, distribution). — Oyakawa, Menezes, 2011: 25 (upper rio Paraná basin, list of species). — Azevedo-Santos et al., 2023: 541, 549, 551, fig. 8, 11 (list of species, whereabouts of holotype, photography of holotype EEBP 617, photography of topotype EEBP 629). Heptapterus brachynema. — Mees, 1974: 180 (comparison with Heptapterus lopezi [= ‘ Chasmocranus ’ lopezae]). — Mees, 1987: 455 (list of Heptapterus species, anal-fin rays number, adipose-fin morphology). Chasmocranus brachynemus. — Ferraris Jr., 2007: 182 (cat

Redescription of ‘ Chasmocranus’ brachynema (Heptapteridae: Heptapterini)

description

Description. Morphometric data in Tab. 1. Dorsal profile convex from premaxillary symphysis to posterior nostril, straight to eye. Dorsally positioned eye with strongly convex profile. Dorsal profile straight from eye to end of supraoccipital, slightly convex to dorsal-fin insertion, slightly concave to adipose-fin insertion, straight along adipose-fin base. Caudal-fin base slightly convex. Ventral head profile and ventral abdominal profile slightly convex. Ventral profile from pelvic-fin to anal-fin insertion approximately straight. Anal-fin base straight, slightly ascending. Caudal peduncle profile straight. In dorsal view, mouth rim convex. Lateral profile of head convex due to well-developed adductor mandibulae muscle. Lateral profile of body straight to slightly convex along abdomen, then tapering to caudal-fin base. Abdominal region depressed, distinctly broader than deep; in cross-section, something between elliptic and rectangular. Cross section at dorsal-fin base approximately as broad as deep, between round and square. Body compressed from adipose-fin base to caudal fin, cross-section distinctly deeper than broad. Head much depressed, flat dorsally and ventrally, rounded

Redescription of ‘ Chasmocranus’ brachynema (Heptapteridae: Heptapterini)