Lontra longicaudis (Olfers 1818) [Lutra] longicaudis Olfers 1818, in: Eschwege, J. Brasilien, Neue Bibliothek. Reisenb., Vol. 15, 2: 233. Type Locality: " Brasilien.". Vernacular Names: Neotropical Otter. Subspecies:: Subspecies Lontra longicaudis subsp. longicaudis Olfers 1818 Subspecies Lontra longicaudis subsp. annectens Major 1897 Subspecies Lontra longicaudis subsp. enudris F. G. Cuvier 1823 Distribution: Argentina, Belize, Brazil, Columbia, Costa Rica, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Uruguay, Venezuela. Conservation: CITES – Appendix I; U.S. ESA – Endangered as L. longicaudis (incl. platensis); IUCN – Data Deficient. Discussion: Van Zyll de Jong (1972) included annectens, enudris, incarum, mesopetes, and platensis; however, Pohle (1920 a), Cabrera (1957), and Harris (1968) recognized these as distinct species. These taxa (often referred to as the annectens group) were distinguished primarily by variation in the shape of the rhinarium; van Zyll de Jong's (1972) analysis suggested that these should be considered conspecific. Reviewed by Larivière (1999 b). Synonyms allocated according to Hall (1981) and Larivière (1999 b).

Published as part of Wilson, Don E. & Reeder, DeeAnn, 2005, Order Carnivora, pp. 532-628 in Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1, Baltimore :The Johns Hopkins University Press on page 603, DOI: 10.5281/zenodo.7316519