Classificação / Names
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Characiformes (Characins) >
Alestidae (African tetras)
Etymology: Alestion: Alestion is from Alestes Müller & Troschel 1844 (origin unknown), and the Greek diminutive suffix -ion. Gender masculine. While names ended in -ion classically are of neuter gender, for purposes of zoological nomenclature they may be regarded as masculine, as also with Thrattidion Roberts 1972 and Leptophilypnion Roberts 2013.; rapax: The species epithet rapax is from Greek rapax, an adjective meaning voracious, rapacious, or predatory (Ref. 123194).
Environment: milieu / climate zone / depth range / distribution range
Ecologia
; Água doce bentopelágico; intervalo de profundidade 0 - 1 m (Ref. 123194). Tropical
Africa: Kwilu River, Lower Congo River basin, in Democratic Republic of the Congo (Ref. 123194).
Tamanho / Peso / Idade
Maturity: Lm ? range ? - ? cm
Max length : 1.7 cm SL macho/indeterminado; (Ref. 123194)
Descrição suscinta
Morfologia | Morfometria
Espinhos dorsais (total): 0; Raios dorsais (total): 10; Espinhos anais 0; Raios anais : 14; Vértebras: 39 - 40. Diagnosis: This species differs from all other alestid and all other characiform species in having supposed adults with greatly enlarged conical teeth in two rows on the premaxillary and on the dentary (Ref. 123194). Mouth slightly upturned; jaws short, entirely anterior to eyes; teeth with large round base and sharp slightly recurved tip, evidently specialized for puncturing (Ref. 123194). Head and body laterally compressed, slender; circumorbital bones absent; scales absent; postcephalic laterosensory system absent (Ref. 123194).
Found in river with maximum depth about one meter, width of river 40m; water turbid; bottom sand and gravel; with dense cover provided by Vossia and other aquatic plants on one side of channel (Ref. 123194). Stomach contents appear to be exclusively insect remains (Ref. 123194).
Ciclo de vida ou comportamento de acasalamento
Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas
Roberts, T.R., 2019. Alestion rapax, a new genus and species of miniature paedomorphic characiform fish with large conical teeth from the Lower Congo basin (Ostariophysi, Alestidae). Aqua, Int. J. Ichthyol., 25(3):85-102. (Ref. 123194)
Status na Lista Vermelha da UICN (Ref. 130435)
Ameaça para os humanos
Harmless
Uso pelos humanos
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Fontes da internet
Estimates based on models
Índice de diversidade filogenética (Ref.
82804): PD
50 = No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Nível Trófico (Ref.
69278): 3.0 ±0.3 se; based on size and trophs of closest relatives
Resiliência (Ref.
120179): Elevada, tempo mínimo de duplicação da população menor que 15 meses (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
