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There is genetic evidence that the two species of Brazilian gray  Mazama ,  Mazama gouazoubira  and  Mazama nemorivaga , belong to different genera. This study identified significant differences that separated them into distinct groups, based on characteristics of the spermatozoa and ejaculate of both species. The characteristics that most clearly differentiated between the species were ejaculate colour, white for  M. gouazoubira  and reddish for  M. nemorivaga , and sperm head dimensions. Multivariate analysis of sperm head dimension and format data accurately discriminated three groups for species with total percentage of misclassified of 0.71. The individual analysis, by animal, and the multivariate analysis have also discriminated correctly all five animals (total percentage of misclassified of 13.95%), and the canonical plot has shown three different clusters: Cluster 1, including individuals of  M. nemorivaga ; Cluster 2, including two individuals of  M. gouazoubira ; and Cluster 3, including a single individual of  M. gouazoubira . The results obtained in this work corroborate the hypothesis of the formation of new genera and species for gray  Mazama . Moreover, the easily applied method described herein can be used as an auxiliary tool to identify sibling species of other taxonomic groups.

Using sperm morphometry and multivariate analysis to differentiate species of gray Mazama