Centriole behaviour during meiosis of male germ cells of Dermatobia hominis (Diptera:Cuterebridae).
During the meiotic division of Dermatobia hominis spermatogenesis, the centrioles duplicate only in prophase I, giving rise to short cilia which are exposed on the cellular surface. In metaphase I they are internalized and distributed to the daughter cells. Consequently, the secondary spermatocytes have two centrioles which repeat the cycle of cilia externalization followed by internalization. The spermatids receive only one centriole, which changes into a basal body and originates a flagellum. This centriole behaviour seems to be a general feature in insect male germ cell meiosis.
Quagio-Grassiotto
I
I
Department of Morphology, UNESP, São Paulo, Brazil.
de Lello
E
E
D000818:Animals; D002417:Cattle; D002502:Centrioles / Q000502:physiology* / Q000648:ultrastructure; D002923:Cilia; D004175:Diptera / Q000648:ultrastructure*; D008297:Male; D008540:Meiosis / Q000502:physiology*; D008677:Metaphase; D011418:Prophase; D011679:Pupa; D013082:Sperm Tail / Q000648:ultrastructure*; D013091:Spermatogenesis / Q000502:physiology