Classification / Names
Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Teleostei (teleosts) >
Characiformes (Characins) >
Acestrorhamphidae (American tetras) > Acestrorhamphinae
Etymology: Oligosarcus: Greek, oligos = small + Greek arkos = anus (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic. Subtropical
South America: known from only one specimen from Laguna Tropa Vieja, Río de la Plata basin, Uruguay.
Size / Weight / Age
Maturity: Lm ? range ? - ? cm
Max length : 9.7 cm SL male/unsexed; (Ref. 99820)
Short description
Identification keys | Morphology | Morphometrics
Oligosarcus platensis is distinguished from O. amome in having premaxillary teeth in the outer series tricuspidate (vs. pentacuspidate); premaxillary inner series with teeth bi to pentacuspidate (vs. penta to heptacuspidate) ; 17 maxillary teeth (uni to tricuspidate) (vs. ten to eleven maxillary teeth (uni to pentacuspidate)); dentary teeth uni to pentacuspidate (vs. uni to heptacuspidate); 27 branched anal-fin rays (vs. 20 to 23); 44 scales on lateral line (vs. 39 to 41); and 24 predorsal scales (vs. 14 to 16) (Ref. 99820).
Body shape (shape guide): elongated.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
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: Version 2025-2)
Threat to humans
Harmless
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