title: [Ultrastructure of spermatogenesis and spermatozoa of Emallagma cheliferum Selys, 1875 (Coenagrionidae: Odonata)].
abstract: The spermiogenesis in Enallagma cheliferum follows the  usual patterns of differentiation in insects. Thus, the Golgi originates the acrosome; the "nebenkern", the mitochondrial structures that form a long tail with the axonema. The axonema has the configuration 9 + 9 + 2 and around the centriole a centriole adjunt is visible in the immature spermatide. The centriole adjunt differentiates into dense bodies as a "demi-lune" shape in the mature sperm.
mesh_terms: D002843:Chromatin / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000648:ultrastructure; D007313:Insecta / Q000648:ultrastructure*; D008297:Male; D008928:Mitochondria / Q000648:ultrastructure; D013091:Spermatogenesis; D013094:Spermatozoa / Q000648:ultrastructure*; D013737:Testis / Q000166:cytology
chemical_list: D002843:Chromatin
vernacular_title: Ultraestrutura da Espermiogênese e do Espermatozóide de Enallagma cheliferum Selys, 1875 (Coenagrionidae: Odonata).