Classificazione / Nomi
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Gymnotiformes (Knifefishes) >
Rhamphichthyidae (Sand knifefishes)
Etymology: Hypopygus: Greek, hypo = under + Greek, pyge = tail (Ref. 45335); nijsseni: The specific epithet, nijsseni, is a patronym in honour of Hans Nijssen for his contribution to Neotropical ichthyology (Ref. 88778).
Eponymy: Dr Han Nijssen (1935–2013) was a Dutch ichthyologist who was an expert on the genus Corydoras. [...] (Ref. 128868), visit book page.
Ambiente: milieu / zona climatica / distribuzione batimetrica / gamma di distribuzione
Ecologia
; acqua dolce benthopelagico. Tropical
South America: Hypopygus nijsseni is known only from small streams in the vicinity of Tefé (Ref. 88778).
Dimensione / Peso / Età
Maturità: Lm ?  range ? - ? cm
Max length : 9.6 cm TL maschio/sesso non determinato; (Ref. 88778)
Breve descrizione
Chiavi di identificazione | Morfologia | Morfometria
Hypopygus nijsseni is diagnosed from congeners by the following combination of characters: the total number of anal-fin rays (145–152 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 dorsal rami of intermittent branch of anterior lateral line nerve visible as two black parallel lines (versus not visible in H. ortegai), the head length (13.2–15.3% of LEA versus 12.6–13.9 in H. ortegai), the distance at the nape (12.5–13.8% of LEA versus 11.0–12.5 in H. ortegai), the total number of pectoral fin rays (ten to 12 versus 12–16 in H. isbruckeri), the number of scales above the lateral line (five to six versus seven to eight in H. isbruckeri), and the distance from the anus to the anal fin (7.9–9.4% of LEA versus 10.0–12.0 in H. neblinae) (Ref. 88778).
Body shape (shape guide): elongated; Cross section: other (see Diagnosi.
Ciclo vitale e comportamento di accoppiamento
Maturità | Riproduzione | Deposizione | Uova | Fecondità | Larve
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)
Stato della Lista Rossa IUCN (Ref. 130435: Version 2025-2 (Global))
Minaccia per l'uomo
Harmless
Usi umani
Strumenti
Rapporti speciali
Scarica XML
Fonti Internet
Stime basate su modelli
Indice di diversità filogenetica (Fonte Biblio. 82804) |
PD50 = 0.5010 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00269 (0.00108 - 0.00670), b=3.07 (2.85 - 3.29), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Livello trofico (Fonte Biblio. 69278) |
3.1 ±0.4 se; based on size and trophs of closest relatives |
Vulnerabilità della pesca (Ref. 59153) |
Low vulnerability (10 of 100). 🛈 |