Redescription of ‘Chasmocranus’ brachynema

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Redescription of ‘Chasmocranus’ brachynema

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Deprá, G. de C. & V. Slobodian. (2024). Redescription of ‘Chasmocranus’ brachynema (Heptapteridae: Heptapterini). Neotropical Ichthyology, 22(1), e230091.
https://doi.org/10.1590/1982-0224-2023-0091
https://www.scielo.br/j/ni/a/GrBKTqTnPp ... f/?lang=en
Abstract
The endangered species ‘Chasmocranus’ brachynema is redescribed and diagnosed among other Heptapterini by having the adipose fin extensively fused with the caudal fin, caudal fin shallowly bifurcate, and anal-fin insertion posterior to a vertical through the adipose-fin insertion, in addition to peculiarities of the head and mouth morphology. The species seems to be very rare, known only from five preserved specimens from the main channels of the Paraná and Mogi-Guaçu rivers, and from a tributary of the rio Ivaí, all in the Upper Paraná ecoregion.
Keywords: Endangered species;
Heptapterus longicauda
; Rio Ivaí; Rio Mogi-Guaçu; Taxonomic review
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FIGURE 2: ‘Chasmocranus’ brachynema, NUP 22699, 93.0 mm SL, 23°40’42”S 53°15’47”W, córrego Piava, tributary to the rio das Antas, tributary to the rio Ivaí, upper rio Paraná basin at the municipality of Umuarama, State of Paraná, Brazil.
FIGURE 2: ‘Chasmocranus’ brachynema, NUP 22699, 93.0 mm SL, 23°40’42”S 53°15’47”W, córrego Piava, tributary to the rio das Antas, tributary to the rio Ivaí, upper rio Paraná basin at the municipality of Umuarama, State of Paraná, Brazil.
FIGURE 3: ‘Chasmocranus’ brachynema, EEBP 629, 74.9 mm SL, rio Mogi-Guaçu about 1 km downstream from Cachoeira de Emas. Schubart (1964) reported this specimen after the original description.
FIGURE 3: ‘Chasmocranus’ brachynema, EEBP 629, 74.9 mm SL, rio Mogi-Guaçu about 1 km downstream from Cachoeira de Emas. Schubart (1964) reported this specimen after the original description.
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