Abstract
Iotabrycon praecox (Characidae: Stevardiinae) has been reported as endemic to the Guayas River drainage in Western Ecuador since its description in 1973. We collected one specimen of I. praecox in the Santa Rosa River, Santa Rosa drainage, El Oro Province, approximately 144 km south of the Guayas drainage, significantly expanding the known geographic distribution of the species. Given the severe anthropomorphic pressures impacting fishes in Southwestern Ecuador, there is an urgent need to evaluate the present status of I. praecox in the region.
Highlights
Given the severe anthropomorphic pressures impacting fishes in Southwestern Ecuador, there is an urgent need to evaluate the present status of I. praecox in the region
Iotabrycon is a monotypic characid genus thought to be endemic to the Guayas River drainage in Western Ecuador (Roberts 1973; Barriga 2012)
Iotabryon was further placed in the tribe Xenurobryconini with the allopatric genera Argopleura, Scopaeocharax, Tyttocharax, and Xenurobrycon based on synapomorphies associated with the caudal fin organ and pelvic fin rays of sexually mature males (Weitzman and Fink 1985)
Summary
We report the collection of one specimen of I. praecox in the Santa Rosa drainage, a small coastal drainage approximately 144 km south of the Guayas drainage in El Oro province, Southwestern Ecuador. Abstract: Iotabrycon praecox (Characidae: Stevardiinae) has been reported as endemic to the Guayas River drainage in Western Ecuador since its description in 1973.
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