A new genus and species of blind sleeper (Teleostei: Eleotridae) from Oaxaca, Mexico: First obligate cave gobiiform in the Western Hemisphere

Copeia
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Abstract

Caecieleotris morrisi, new genus and species of sleeper (family Eleotridae), is described from a submerged freshwater cave in a karst region of the northern portion of the State of Oaxaca, Mexico, Río Papaloapan drainage, Gulf of Mexico basin. The new species represents the first cave-adapted sleeper known from the Western Hemisphere and is one of only 13 stygobitic gobiiforms known worldwide, with all others limited in distribution to the Indo-Pacific region. The new taxon represents a third independent evolution of a hypogean lifestyle in sleepers, the others being two species ofOxyeleotris (Ocaeca and Ocolasi) from New Guinea and a single species, Bostrychus microphthalmus, from Sulawesi. Caecieleotris morrisi, new species, is distinguished from epigean eleotrids of the Western Atlantic in lacking functional eyes and body pigmentation, as well as having other troglomorphic features. It shares convergent aspects of morphology with cave-dwelling species of Oxyeleotris and Bmicrophthalmus but differs from those taxa in lacking cephalic pores and head squamation, among other characters. Description of Cmorrisi, new species, brings the total number of eleotrid species known from Mexico to 12. Seven of these, including the new species, occur on the Atlantic Slope.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title A new genus and species of blind sleeper (Teleostei: Eleotridae) from Oaxaca, Mexico: First obligate cave gobiiform in the Western Hemisphere
Series title Copeia
DOI 10.1643/CI-15-275
Volume 104
Issue 2
Year Published 2016
Language English
Publisher The American Society of Ichthyologists and Herpetologists
Contributing office(s) Wetland and Aquatic Research Center
Description 12 p.
First page 506
Last page 517
Online Only (Y/N) Y
Additional Online Files (Y/N) N