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Gymnotiformes (Knifefishes) >
Hypopomidae (Bluntnose knifefishes)
Etymology: Brachyhypopomus: Greek, brachys, eia = short + Greek, hypo = under + Greek, poma, -atos = cover (Ref. 45335); bullocki: Named for Theodore Holmes Bullock, a pioneer of the comparative neurobiology of both invertebrates and vertebrates.
neurobiology of both invertebrates and vertebrates.
Eponymy: Dr Theodore Holmes Bullock (1915–2005) was a comparative neurobiologist, interested in both invertebrates and vertebrates. [...] (Ref. 128868), visit book page.
Окружающая среда: среда / климатическая зона / пределы глубины / диапазон распространения
экология
; пресноводный донно-пелагический. Tropical
South America: Orinoco basin in Venezuela and Colombia; rio Branco drainage in Guyana and Brazil, as well as in the upper rio Negro near the mouth of the rio Branco, but is not known from elsewhere in the Amazon system, or in the Guianas.
Размер / Вес / Возраст
половая зрелость: Lm ? range ? - ? cm
Max length : 22.1 cm TL самец/пол неопределен; (Ref. 81045)
Краткое описание
определительные ключи | морфология | морфометрия
членистые (мягкие) лучи анального плавника: 196 - 233. Can be distinguished by the following combination of features: elongated caudal filament reaching up to 45% TL in reproductive males; 6-11 wide, evenly spaced saddles of pigment over dorsum connecting to lateral bands; mesocoracoid bone present; large eye, 15.5-19.2% HL; short abdomen, usually with 12 pre-caudal vertebrae (range 11-13); poorly ossified third and fourth (outermost) branchiostegal rays, much enlarged distally, covering distal portions of the first two branchiostegal rays externally and contributing to bulbous appearance of opercular region (Ref. 81045).
Facultative air-breathing in the genus (Ref. 126274); Inhabits clear, shallow, standing water in open savanna, or savanna mixed with stands of Mauritia palm. Collected in the vegetation along the banks of small pools fed by steams. Occurs inactive during the day among the stems and roots of emergent grasses and sedges. Encountered only in very low conductivity water (<25 μS/cm) where it usually co-inhabits with Brachyhypopomus brevirostris. The electric organ discharge waveform is biphasic, 0.9-1.6 milliseconds in duration, and the pulse rate ranges from 20 to 80 Hz (Ref. 81045).
Жизненный цикл и брачное поведение
половая зрелость | размножение | нерест | икра | Плодовитость | личинки
Sullivan, J.P., 2009. Brachyhypopomus bullocki, a new species of electric knifefish (Gymnotiformes: Hypopomidae) from northern South America. Proc. Acad. Nat. Sci. Phila. 158:183-192. (Ref. 81045)
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Оценки, основанные на моделях
Индекс филогенетического разнообразия (ссылка
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00372 (0.00141 - 0.00980), b=3.06 (2.83 - 3.29), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Трофический уровень (ссылка
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Уязвимость рыбной ловли (Ref.
59153): Low vulnerability (12 of 100).
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