Review of the Cedazo fauna equids from the Pleistocene of Aguascalientes, Mexico

Abstract

In regard of similarities between dental sizes and patterns, Mooser and Dalquest in 1975 reduced to seven the 11 equid species suggested by Mooser in 1958 in the Cedazo local fauna. According to the improbable coexistence of so many equids in a single tanatocenosis, fossil material from these deposits was reexamined in a quantitative approach. Working with the hypothesis that the simultaneous presence of two or more equid species is only possible if at least one anatomical character is morphologically displaced. A frequency distribution analysis on the size curves-represented by antero-posterior diameters of cheek teeth-and of other quantitative dental characters considered of taxonomic importance-ratio of transverse and antero-posterior diameters and ratio of the length of protocone and antero-posterior diameter-suggest that the sample is homogeneous... In order to continue, download full text in PDF.