Brachyhypopomus arrayae

distribution

Distribution: Upper Madeira River basin, especially Beni River, Bolivia, and Madre de Dios River, Peru (Crampton et al., 2016 b).

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

biology_ecology

Ecological notes. The type series was collected from high-conductivity whitewater floodplain sites and from the lower, seasonally inundated reaches of terra firme streams. It was encountered most commonly in marginal root mats, and in emergent or submerged aquatic vegetation. The following water parameters were recorded at the sampling sites: conductivity 150 - 160 µScm- 1, dissolved oxygen 5.0 - 6.0 mgl- 1, temperature 27 - 28 ° C, and pH 7.5 - 7.6. Adults in breeding condition were found during the dry season in June-July 2007. However, the duration and timing of breeding are otherwise unknown. Stomach contents of specimens from the type locality comprise aquatic insect larvae and other small aquatic invertebrates (WGRC unpublished data). Co-occurring congeners: Brachyhypopomus arrayae is known to co-occur in geographical sympatry and ecological syntopy with the following whitewater floodplain-occurring species: B. bombilla, B. brevirostris, B. pinnicaudatus, and B. walteri. In the region of the type locality it exhibits a largely allotopic distribution with the following terra firme stream occurring species: B. alberti and B. sullivani (although B. arrayae was found with B. albe

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. 6. Meristic and morphometric data for examined specimens presented in Tables 2 - 6. Body shallow to moderate in depth. Head short to moderate in length and moderate in depth. Dorsal profile of head slightly convex from occiput to snout, ventral profile of head slightly convex between operculum and snout, snout rounded and bulbous. Eye moderate in size. Upper jaw with slight to moderate sigmoidal angle between premaxillary and maxillary portions in lateral view. No accessory electric organ over operculum. Gill filaments on first gill arch 32 - 39 (median 36, n = 6). Pectoral fin moderate in width, pectoral-fin rays 16 - 19 (mode 17). Precaudal vertebrae 20 - 23 (mode 22) including 1 - 2 (mode 2) transitional vertebrae. Anal-fin origin slightly (<0.25 HL distance) anterior or posterior to, or near, tip of pectoral fin. Anal-fin rays 175 - 212 (median 201). Dorsal rami of recurrent branch of anterior lateral line nerve not visible. Middorsal region of body scaled. Rows of scales above lateral line 5 - 6 (mode 5). Lateral line discontinuous in most examined specimens; area in mid-body with no pored lateral-line scal

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: 836 C 199 C- 3 EBA- 4788 - B 8 D 5 - AB 4 DEBEABF 05 (Fig. 6; Tables 2 - 6)

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