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Gymnotiformes (Knifefishes) >
Hypopomidae (Bluntnose knifefishes)
Etymology: Brachyhypopomus: Greek, brachys, eia = short + Greek, hypo = under + Greek, poma, -atos = cover (Ref. 45335); gauderio: 'Gaudério', from the Brazilian folk traditions a synonym for 'gaúcho', meaning the person who lives in the countryside (pampas) of Rio Grande do Sul state, southern Brazil, Uruguay and Argentina, named in reference to the geographic distribution of the sp.
Môi trường: môi trường / vùng khí hậu / Mức độ sâu / phạm vi phân phối
Sinh thái học
; nước ngọt sống nổi và đáy. Tropical; 29°S - 31°S, 49°W - 52°W
South America: Brazil, Uruguay and Paraguay. Brachyhypopomus gauderio is known from the Laguna dos Patos, Rio Uruguay and Rio Tramandaí drainages in the Rio Grande do Sul state, Brazil, being widely distributed from the central, southern and coastal regions of the state. It also occurs in the Rio Uruguay basin in Uruguay and in the Rio Paraguay basin in Paraguay (Ref. 80844).
Bộ gần gũi / Khối lượng (Trọng lượng) / Tuổi
Chín muồi sinh dục: Lm ? range ? - ? cm
Max length : 14.9 cm SL con đực/không giới tính; (Ref. 80844)
Mô tả ngắn gọn
Khóa để định loại | Hình thái học | Sinh trắc học
Các tia vây lưng cứng (tổng cộng) : 1 - 2; Các vây lưng mềm (tổng cộng) : 13 - 15; Tia cứng vây hậu môn: 6 - 10; Tia mềm vây hậu môn: 173 - 206. Head conical, nearly triangular in lateral view,
snout short and blunt, eyes small, mouth terminal with upper jaw length equal to lower jaw, no teeth in both jaws. Body laterally compressed. Dorsal profile convex from snout to caudal filament, most notably at anterior half of body. Ventral profile convex from lower jaw to anterior anal-fin base; nearly straight from that point to caudal filament. Highest body depth located at anal-fin origin. Body depth increasing from head to anal-fin origin, remaining nearly same depth to close to 40th anal-fin ray, sharply decreasing from that point to caudal filament. Caudal filament moderately short in all specimens; caudal filament slender and nearly cylindrical in females, juveniles and males in non-reproductive period; caudal filament vertically broadened and laterally compressed in sexually mature males. Cycloid scales covering body, except head and fins. Scales smaller on anterior portion of body; five to seven series of large scales along mid-lateral portion of body, reducing to two or three series posteriorly. Mid-lateral scales nearly twice larger than dorso-lateral and dorsal scales and four times larger in diameter than anterior ones; smallest scales covering region of anal-fin pterygiophores. First anterior perforated scale of lateral line above pectoral-fin origin; lateral line irregular, not extending to caudal filament. Branchial aperture small and slightly anterior to pectoral-fin origin. Pectoral fins rounded and with perpendicular insertion; pectoral-fin rays i–ii + 13–15 (15–17 total pectoral-fin rays, n=38, mode=16). Anal-fin relatively long with vi–x + 173–206 rays (180–216 total anal-fin rays, n=38, mode=198). Anal-fin origin located at same line of posterior edge of pectoral fin. Precaudal vertebrae 20–21 (18–19 anterior, 1–2 transitional; n=5). General body color varying from light brown to yellow. Head darker than rest of body. Dorsal surface with chocolate-brown stains that are connected forming reticulated drawing contrasting with yellow background. Variable number of brown stripes running from dorsal stains to base of anal fin, roughly defined in middle of body and occurring from head to tip of caudal filament. Anal and pectoral fins speckled with dark brown pigment, with hyaline inter-radial membranes. (Ref. 80844).
Body shape (shape guide): elongated; Cross section: compressed.
Facultative air-breathing in the genus (Ref. 126274)
Vòng đời và hành vi giao phối
Chín muồi sinh dục | Sự tái sinh sản | Đẻ trứng | Các trứng | Sự sinh sản | Ấu trùng
Giora, J. and L.R. Malabarba, 2009. Brachyhypopomus gauderio, new species, a new example of underestimated species diversity of electric fishes in the southern South America (Gymnotiformes: Hypopomidae). Zootaxa 2093:60-68. (Ref. 80844)
Tình trạng Sách đỏ IUCN (Ref. 130435: Version 2025-2 (Global))
Mối đe dọa đối với con người
Harmless
Sử dụng của con người
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Ước tính dựa trên mô hình
Chỉ số đa dạng phát sinh loài (Tài liệu tham khảo
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).
Mức dinh dưỡng (Tài liệu tham khảo
69278): 3.1 ±0.4 se; based on size and trophs of closest relatives
Sự dễ bị tổn thương của nghề đánh cá (Ref.
59153): Low vulnerability (10 of 100).
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