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The representatives of the lacewing families   Myrmeleontidae  ,   Ascalaphidae  , and   Nemopteridae   (the suborder   Myrmeleontiformia  ) were studied with reference to the number of testicular follicles in males and the number of ovarioles in females. We have found that the number of follicles is highly variable, at least in the first two families. In the comparatively more fully explored family   Myrmeleontidae  , the species studied have three to several hundred follicles per testis, the dominant values being six and five. In   Ascalaphidae  , two main patterns were revealed: testes with a low number of follicles (six and twelve per testis) and testes with multiple follicles (several dozens). Moreover, differences in the follicle number were often observed both between males of the same species and different testes of a male. In   Nemopteridae  , considered a sister group to the [  Myrmeleontidae   +   Ascalaphidae  ] clade, the testes in males were found to consist of six or five follicles each. This implies that a low number of follicles, most likely six, is an ancestral trait in   Myrmeleontiformia  . All other numbers are thus the derived traits and are probably due to a simple oligomerization or a simple polymerization, the latter process having been very intensive in the evolution of the suborder. Conversely, females were found to have ten ovarioles per ovary in each of the three families studied.

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Variation in the number of testicular follicles and ovarioles among 18 lacewing species of the families   Myrmeleontidae  ,   Ascalaphidae  , and   Nemopteridae   (  Insecta  ,   Neuroptera  ,   Myrmeleontiformia  )