A “13+0” axonemal pattern in the spermatozoon ofNeocondeellum dolichotarsum (Insecta, Protura)

Abstract

The new 13+0 axonemal model has been described in the proturanNeocondeellum. All the doublets are devoid of dynein arms and the spermatozoa are immotile. A protruded acrosome is evident in the mature coiled spermatozoa. On the basis of the spermatological results Protentomidae seem closely related to Acerentomidae.