Taxonomic Status of the Genus Sotalia: Species Level Ranking for Tuxcuxi (Sotalia fluviatilis) and Costero (Sotalia guianesis) Dolphins. Marine Mammal Science. VOL. 23, NO. 2. Nicaragua Colombian Caribbean, Maracaibo Lake, French Guiana Amazonian Estuary Brazilian Coast, Peruvian Amazon Colombian Amazon, Brazilian Amazon.

Project Details

Date : 2007
Volunteer Name : Caballero, S. et al.
Category : ,

Project Description

Abstract: Dolphins of the genus Sotalia are found along the Caribbean and Atlantic coasts of Central and South America and in the Amazon River and most of its tributaries. At present, the taxonomy of these dolphins remains unresolved. Although five species were described in the late 1800s, only one species is recognized currently (Sotalia fluviatilis) with two ecotypes or subspecies, the coastal subspecies (Sotalia fluviatilis guianensis) and the riverine subspecies (Sotalia fluviatilis fluviatilis). Recent morpho- metric analyses, as well as mitochondrial DNA analysis, suggested recognition of each subspecies as separate species. Here we review the history of the classification of this genus and present new genetic evidence from ten nuclear and three mitochondrial genes supporting the elevation of each subspecies to the species level under the Genealogical/Lineage Concordance Species Concept and the criterion of irreversible divergence. We also review additional evidence for this taxonomic revision from previously published and unpublished genetic, morphological, and ecological stud- ies. We propose the common name “costero” for the coastal species, Sotalia guianensis (Van Be ́ne ́den 1864), and accept the previously proposed “tucuxi” dolphin, Sotalia fluviatilis (Gervais, 1853), for the riverine species.