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Characiformes (Characins) >
Stevardiidae (Stevardiids) > Hemibryconinae
Etymology: Hemibrycon: Greek, hemi = half + Greek, bryko = to bite (Ref. 45335); divisorensis: Named for its type locality, Zona Reservada Sierra del Divisor; noun in apposition.
Ambiente: milieu / zona climatica / distribuzione batimetrica / gamma di distribuzione
Ecologia
; acqua dolce pelagico. Tropical
South America: Río Ucayali drainage in Peru.
Dimensione / Peso / Età
Maturità: Lm ?  range ? - ? cm
Max length : 6.8 cm SL maschio/sesso non determinato; (Ref. 75799); 8.2 cm SL (female)
Breve descrizione
Chiavi di identificazione | Morfologia | Morfometria
Raggi dorsali molli (totale) : 8; Raggi anali molli: 25 - 28; Vertebre: 38 - 39. This species is distinguished from its congeners by the following characters: a wide black asymmetrical spot covering base of caudal-fin rays, extending along entire length of caudal-fin rays 9 to 12-13 (except H. surinamensis); a black band in the lower half of the caudal peduncle from the region above the last anal-fin rays to the caudal-fin base; 4-5 scale rows below lateral line (vs. 5-9) except from H. mikrostiktos and H. surinamensis (Ref. 75799); differs from H. mikrostiktos by the number of branched anal-fin rays (24-30 vs. 18-21), and from H. surinamensis by the number of scale sheath along anal-fin base (17-22 vs. 12-17), and by the number of cusps in the inner row of the premaxilla teeth (5-7 vs. 4-5) (Ref. 85819).
Body shape (shape guide): elongated; Cross section: compressed.
Type specimens were collected at the tributaries of río Tapiche which are about 2-3 m wide with crystalline water, 0.3-0.5 m deep, medium water current, sandy substrate, and with moderate amount of riparian vegetation. This species has a typical aquasperm with a spherical to slightly ovoid nucleus , suggesting that the species is non-inseminating. It was not possible to verify the presence of spermatozoa in the ovaries due to the lack of mature females. Mature males possess bony hooks on rays of all fins, except the caudal fin; the presence of which may represent a secondary sexual character (Ref. 75799).
Ciclo vitale e comportamento di accoppiamento
Maturità | Riproduzione | Deposizione | Uova | Fecondità | Larve
Bertaco, V.A. and L.R. Malabarba, 2010. A review of the Cis-Andean species of Hemibrycon Günther (Teleostei: Characiformes: Characidae: Stevardiinae), with description of two new species. Neotrop. Ichthyol. 8(4):737-770. (Ref. 85819)
Stato della Lista Rossa IUCN (Ref. 130435: Version 2025-2 (Global))
Minaccia per l'uomo
Harmless
Usi umani
Pesca: di nessun interesse
Strumenti
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Fonti Internet
Stime basate su modelli
Indice di diversità filogenetica (Fonte Biblio.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00776 (0.00322 - 0.01872), b=3.13 (2.92 - 3.34), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Livello trofico (Fonte Biblio.
69278): 3.0 ±0.4 se; based on size and trophs of closest relatives
Vulnerabilità della pesca (Ref.
59153): Low vulnerability (10 of 100).
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