Abstract
The spermatozoon of Mayetiola gall midge is characterized by numerous longitudinal microtubules surrounding a “9+0” axoneme. The doublets lack dynein arms and consequently the spermatozoon is immotile. The main peculiarity of Mayetiola sperm flagellum is the increased number of doublets, from 9 in the postnuclear region to 60 at the posterior level. The supernumerary doublets come from microtubular singlets on which a B subfiber is assembled. Isolated microtubules represent the A subfiber of the newly formed doublets. Both the original doublets and those secondarily formed have the same number of protofilaments. The formation mechanism of the Mayetiola aberrant axoneme might explain the origin of those giant sperm flagella, provided with numerous doublets, found in many species of this group.
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