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Gymnotiformes (Knifefishes) >
Hypopomidae (Bluntnose knifefishes)
Etymology: Hypopygus: Greek, hypo = under + Greek, pyge = tail (Ref. 45335); ortegai: The specific epithet, ortegai, is a patronym in honour of the Peruvian ichthyologist Hernán Ortega Torres, for his many contributions to Neotropicalichthyology and for his participation in the expedition that discovered this species (Ref. 88778).
Environment: milieu / climate zone / depth range / distribution range
Ecologie
; zoet water benthopelagisch. Tropical
South America: Hypopygus ortegai is known from small tributaries in the upper Amazon of Peru, near the towns of Iquitos and Jenaro Herrera, Loreto (Ref. 88778).
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 11.4 cm TL mannelijk / geslacht onbekend; (Ref. 88778)
Korte beschrijving
Determinatiesleutels | Morfologie | Morfometrie
Hypopygus ortegai is diagnosed from congeners by the following combination of characters: the dorsal rami of intermittent branch of anterior lateral line nerve not visible (versus visible in remain species), the total number of anal-fin rays (137-147 versus 102–135 in H. hoedemani, H. lepturus, and H. minissimus; 155–174 in H. cryptogenes), the presence of the sixth infraorbital bone (versus absence in H. hoedemani, H. lepturus, and H. minissimus), the presence of oblique bands (versus absence in H. minissimus), the presence of scales at midbody (versus absence in H. minissimus), the head length (12.6–13.9% of LEA versus 13.2–15.3 in H. nijsseni), the distance at the nape (11.0–12.5% of LEA versus 12.5–13.8 in H. nijsseni), the distance from the anus to the anal-fin ray (6.5–9.5% of LEA versus 10.0–12.0 in H. neblinae), and the head length (12.6–13.9% of LEA versus 13.2–22.9 in H. isbruckeri) (Ref. 88778).
Electric organ discharge: Data available from eight specimens in type series, from the vicinity of Jenaro Herrera, Loreto, Peru. Hypopygus ortegai generates a tetraphasic EOD ranging in duration from 1.17 to 2.11 ms (mean 1.73, N = 7), and with a PPF ranging from 1.408 to 1.869 kHz (mean 1.661, N = 7). Mean pulse rate during the day ranges from 44.7 to 56.8 Hz (mean 50.3, mean CV 0.91, N = 8), and during the night from 59.2 to 65.5 Hz (mean 62.1, mean CV 2.87, N = 8) (Ref. 88778).
Levenscyclus en paargedrag
Maturities | Voortplanting | Spawnings | Egg(s) | Fecundities | Larven
de Santana, C.D. and W.G.R. Crampton, 2011. Phylogenetic interrelationships, taxonomy, and reductive evolution in the Neotropical electric fish genus Hypopygus (Teleostei, Ostariophysi, Gymnotiformes). Zool. J. Linn. Soc. 163:1096-1156. (Ref. 88778)
Status op de Rode Lijst van het IUCN (Ref. 130435)
Gevaar voor de mens
Harmless
Gebruik door de mens
Tools
Speciale rapporten
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 0.5039 [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).
Trofisch niveau (Ref.
69278): 3.1 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
![Image of Hypopygus ortegai (Ortega\](/images/thumbnails/gif/tn_HYPOPOT0.gif "Image of Hypopygus ortegai (Ortega\")
