Classification / Names
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Characiformes (Characins) >
Characidae (Characins; tetras) > Stethaprioninae
Etymology: Oligosarcus: Greek, oligos = small + Greek arkos = anus (Ref. 45335); amome: The specific name amome is a Guaraní word, meaning once in a while, rare. This is in references to the low occurrence of the specimens of this species in the localities where they were captured.
Environment: milieu / climate zone / depth range / distribution range
Écologie
; eau douce benthopélagique. Subtropical
South America: Río Uruguay basin, Misiones, Argentina.
Taille / Poids / Âge
Maturity: Lm ? range ? - ? cm
Max length : 12.5 cm SL mâle / non sexé; (Ref. 99820)
Description synthétique
Clés d'identification | Morphologie | Morphométrie
Rayons mous dorsaux (Total) : 12; Vertèbres: 35. Oligosarcus amome can be distinguished from all congeners except O. platensis and O. itau by having two conspicuous series of teeth on the premaxilla. It differs from O. platensis in having premaxillary teeth in the outer series pentacuspidate (vs. tricuspidate); premaxillary inner series with five teeth penta to heptacuspidate (vs. bi to pentacuspidate); ten to eleven maxillary teeth (uni to pentacuspidate) (vs. vs. 17 teeth (uni to tricuspidate); dentary teeth uni to heptacuspidate (vs. uni to pentacuspidate); 20-23 branched anal-fin rays (vs. 27); 39-41 lateral line scales (vs. 44); and 14-16 predorsal scales (vs. 24).
Oligosarcus amome can be diagnosed from O. itau in having premaxillary teeth in the outer series pentacuspidate (vs. tricuspidate); 39-41(vs. 41-42) scales on lateral line, and 14-16 (vs. 16-17) predorsal scales. It can be further distinguished from O. itau by following morphometric characters: predorsal distance (51.4-53.5 vs. 54.7-57.0% SL); body depth (32.0-34.0 vs. 36.3-37.5% SL); pectoral-fin length (18.6-20.7 vs. 22.7-23.9% SL); pelvic-fin length (14.5-16.2 vs. 18.2-20.0% SL); pectoral to pelvic-fin distance (24.1-25.7 vs. 19.7-20.1% SL); head length (26.7-27.8 vs. 28.7-30.8% SL); peduncle depth (10.5-11.4 vs. 12.6-13.2% SL); peduncle length (10.5-12.0 vs. 14.9-16.0% SL); eye diameter (26.9-29.3vs. 31.6-33.2% HL); and snout length (27.5-29.9 vs. 23.9-24.6% HL). In addition to the presence of two series of teeth on the premaxilla, Oligosarcus amome is distinguished from O. brevioris, O. jacuiensis, O. jenynsii, and O. oligolepis, occurring in the río Uruguay basin, by several characters. It is distinguished from O. brevioris, O. jacuiensis, and O. jenynsii by having 17-18 circumpeduncular scales (vs. 21-23, 21-25, and 12-16 respectively), 39-41 lateral line scales (vs. 47-56, 55-65, and 54-63 respectively), and 3 ectopterygoid teeth (vs. 7-18, 10-20, and 12-16, respectively). It differs clearly from O. oligolepis by having 17-18 circumpeduncular scales (vs. 25-27), 39-41 lateral line scales (vs. 72-79), and 3 ectopterygoid teeth (vs. 14-16). It is distinguished from O. pintoi in having 20-23 (vs. 24-28) branched anal fin-rays; 10-11 (vs. 15-23) maxillary teeth; 3 (vs. 5-14) ectopterygoid teeth; and penta to heptacuspidate (vs. all tricuspidate premaxillary teeth) (Ref. 99820).
Life cycle and mating behavior
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Almirón, A., J. Casciotta, L. Piálek, K. Doubnerová and O. Říčan, 2015. Oligosarcus amome (Ostariophysi: Characidae), a new species from the río Uruguay basin, Misiones, Argentina. Zootaxa 3915(1):581-590. (Ref. 99820)
Statut dans la liste rouge de l'IUCN (Ref. 130435: Version 2024-1)
Menace pour l'homme
Harmless
Utilisations par l'homme
Outils
Articles particuliers
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Sources Internet
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=0.00933 (0.00418 - 0.02084), b=3.10 (2.93 - 3.27), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Niveau trophique (Ref.
69278): 3.9 ±0.7 se; based on size and trophs of closest relatives
Résilience (Ref.
120179): Haut, temps minimum de doublement de population inférieur à 15 mois (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
