the ultrastructural analysis on comparative spermatology reported here shows that dichotomous spermatogenesis producing concomitant , normal , anucleate ( apyrene ) and nucleate ( eupyrene ) spermatozoa : ( 1 ) is generalized in lepidoptera as it occurs , in addition to higher lepidoptera , also in the primitive hepialoidea , ( 2 ) is present in zeugloptera , and ( 3 ) is absent from trichoptera which produce only nucleate spermatozoa .
C0037864
spermatogenesis
C0037868
spermatozoa