Classification / Names
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Gymnotiformes (Knifefishes) >
Hypopomidae (Bluntnose knifefishes)
Etymology: Brachyhypopomus: Greek, brachys, eia = short + Greek, hypo = under + Greek, poma, -atos = cover (Ref. 45335); draco: The specific names is from the Greek 'drakon' meaning dragon, in reference to the shape of distal portion of caudal filament in mature males, similar to that illustrated in these imaginary creatures..
Environment: milieu / climate zone / depth range / distribution range
Οικολογία
; Γλυκού νερού βενθοπελαγικό. Subtropical
South America: Brazil, Uruguay and Paraguay.
Μέγεθος / Βάρος / Age
Maturity: Lm ? range ? - ? cm
Max length : 15.2 cm OT αρσενικό/απροσδιόριστο; (Ref. 76853)
Short description
Κλείδες προσδιορισμού | Μορφολογία | Μορφομετρία
Μαλακές εδρικές ακτίνες: 155 - 198. Diagnosed from all congeners by the extreme broadening of the distal portion of the caudal filament in males during the reproductive period to form a distinct paddle shaped structure
(vs. moderately broadened distally in Brachyhypopomus pinnicaudatusand Brachyhypopomus brevirostris into paddle-shaped structures, and vs. broadened along most of the length of the caudal filament in Brachyhypopomus occidentalis, Brachyhypopomus diazi, Brachyhypopomus beebei, and Brachyhypopomus janeiroensis). Differs further from other species of the genus by the following characters: caudal filament length 17.3-35.2% of LEA; pectoral fin ray length 4.1-5.8% of LEA; body depth 8.8-12.2% of LEA; snout length 20.7- 30.0% of HL; gape width 9.5- 16.5% of HL; interorbital distance 22.7-35% of HL; branchial aperture 16.5-26% of HL; head width at operculum 48.4-65% of HL; head width at eyes 31.3-45.6% of HL; number of anal fin rays 155-198; upper jaw equal to lower jaw (Ref. 76853).
Facultative air-breathing in the genus (Ref. 126274); Occurs in river edges, slow-moving creeks, lagoons and flooded areas with muddy or sandy bottom and abundant emergent or floating vegetation (Ref. 76853). Length type refers to the length to the end of anal fin (LEA), measured as the distance from tip of snout to posterior end of anal fin base (Ref. 76853).
Life cycle and mating behavior
Maturities | Αναπαραγωγή | Spawnings | Egg(s) | Fecundities | Προνύμφες
Giora, J., L.R. Malabarba and W. Crampton, 2008. Branchyhypopomus draco, a new sexually dimorphic species of Neotropical electric fish from Southern South America (Gymnotiformes: Hypopomidae). Neotrop. Ichthyol. 6(2):159-168. (Ref. 76853)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
Εργαλεία
Special reports
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Διαδικτυακές πηγές
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00380 (0.00145 - 0.00994), b=3.06 (2.83 - 3.29), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Τροφικό Επίπεδο (Ref.
69278): 3.1 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
