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
Οικολογία
; Γλυκού νερού βενθοπελαγικό. Subtropical
South America: Río Uruguay basin, Misiones, Argentina.
Μέγεθος / Βάρος / Age
Maturity: Lm ? range ? - ? cm
Max length : 12.5 cm SL αρσενικό/απροσδιόριστο; (Ref. 99820)
Short description
Κλείδες προσδιορισμού | Μορφολογία | Μορφομετρία
Μαλακές ραχιαίες ακτίνες (συνολικά) : 12; Σπόνδυλοι: 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
Maturities | Αναπαραγωγή | Spawnings | Egg(s) | Fecundities | Προνύμφες
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)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
Εργαλεία
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Διαδικτυακές πηγές
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=0.01000 (0.00444 - 0.02253), b=3.08 (2.90 - 3.26), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Τροφικό Επίπεδο (Ref.
69278): 3.9 ±0.7 se; based on size and trophs of closest relatives
Ελαστικότητα (Ref.
120179): Υψηλό, ελάχιστος χρόνος για διπλασιασμό πληθυσμού < 15 μήνες (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
