Testicular and spermatogenic characteristics of Lagria villosa (Tenebrionidae: Lagriinae) with taxonomic inferences.

In the present study testicular and spermatogenetic aspects were described for Lagria villosa using light and scanning electron microscopy. In this species, spermiogenesis results in the formation of sperm bundles with spermatozoa arranged in an antiparallel manner, a characteristic observed only in Tenebrionidae. L. villosa, however, has about 60 follicles per testis and up to 1200 spermatozoa per cyst, in contrast to other tenebrionids that exhibit only six follicles in each testis and up to 512 spermatozoa per cyst. Therefore, the antiparallel arrangement of the spermatozoa in the bundle give support to previous works classifying the lagriids in a subfamily (Lagriinae) of Tenebrionidae. Just as the number of spermatozoa per cyst and follicles per testis suggest that they constitute, in fact, a distinct branch of this family.