The Glans Penes and Bacula in Latin American Taxa of the Peromyscus boylii Group

The glans penis and bacular morphology is described for 15 taxa of the Peromyscus boylii species group from Latin America on the basis of 17 qualitative and quantitative characters. These characters were analyzed phenetically using cluster, principal components, and minimum spanning tree analyses. A phylogenetic analysis was performed using 10 characters and 34 character states, with Osgoodomys banderanus as the outgroup taxon. Results from phenetic and phylogenetic analyses indicate that two distinct types of phalli exist among taxa in the P. boylii species group and these correspond to the dichotomous arrangement of taxa into a boylii and an aztecus assemblage as suggested by Carleton (1977). The taxa comprising each assemblage appear to be more closely related to each other than they are to any taxon in the other assemblage. In addition, evidence is presented supporting the distinction of P. b. rowleyi from the other subspecies of P. boylii.