Brachyhypopomus cunia

distribution

Distribution: Madeira River basin, above Machado River, including Guaporé River, Brazil (Crampton et al., 2016 b).

Checklist of Gymnotiformes (Osteichthyes: Ostariophysi) and catalogue of primary types

biology_ecology

Ecological notes. Known from low-conductivity floodplain habitats. The type series was collected from floating macrophytes on the margins of lago Cuniã, a low-conductivity seasonally flooded blackwater lake near the main stem of the lower Madeira. Here the flood season occurs between October and March, and the low-water season from April to September (de Queiroz et al., 2013). Water parameters collected from November 2008 to March 2010 are typical of a lowland blackwater lake: conductivity 2.3 - 11.2 µScm- 1, transparency measured with a Secchi disk 0.35 - 2.69 m, dissolved oxygen 2.2 - 5.8 mgl- 1, temperature 27.1 - 31.3 ° C, and pH 4.52 - 6.88 (de Queiroz et al., 2013). Brachyhypopomus cunia is also common from low-conductivity clearwater (and some blackwater) floodplain sites along most of the length of the rio Guaporé. Mean water parameters, averaged from multiple sites along the rio Guaporé, and over several seasons, include: conductivity 19.5 µScm- 1 (SD 16.79), transparency with Secchi disk 1.04 m (SD 0.44), dissolved oxygen 4.22 mgl- 1 (SD 1.98), temperature 27.5 ° C (SD 2.44), and pH 7.12 (SD 1.06) (L. de Queiroz, unpublished data). Reproductive biology is unknown. Stomach

A taxonomic revision of the Neotropical electric fish genus Brachyhypopomus (Ostariophysi: Gymnotiformes: Hypopomidae), with descriptions of 15 new species

description

Description. Head and body shape, and pigmentation illustrated in Fig. 20. Meristic and morphometric data for examined specimens presented in Tables 2 - 5 and 8. Body shallow to moderate in depth. Head short and moderate to broad in depth. Dorsal profile of head slightly to moderately convex from occiput to snout, ventral profile of head approximately straight to slightly convex between operculum and snout, snout rounded. Eye moderate to large in size. Upper jaw with moderate sigmoidal angle between premaxillary and maxillary portions in lateral view. No accessory electric organ over operculum. Pectoral fin narrow to moderate in width, pectoral-fin rays 10 - 13 (mode 12). Precaudal vertebrae 16 - 17 (mode 16), including 1 - 2 transitional vertebrae (mode 2). Anal-fin origin slightly (<0.25 HL distance) anterior or posterior to, or near, tip of pectoral fin. Anal-fin rays 177 - 224 (median 209). Dorsal rami of recurrent branch of anterior lateral line nerve visible in anterior third of body in most specimens. Middorsal region of body scaled. Rows of scales above lateral line 5 - 7 (mode 6). Lateral line continuous. Sparse depigmented epidermal canals in posterior two thirds of body;

A taxonomic revision of the Neotropical electric fish genus Brachyhypopomus (Ostariophysi: Gymnotiformes: Hypopomidae), with descriptions of 15 new species

description

urn: lsid: zoobank. org: act: E 9 E 6020 F- 21 D 4 - 42 B 5 - 8 F 2 D- 0 F 1 A 1 D 4 E 8645 (Fig. 20; Tables 2 - 5, 8)

A taxonomic revision of the Neotropical electric fish genus Brachyhypopomus (Ostariophysi: Gymnotiformes: Hypopomidae), with descriptions of 15 new species