title: Ultrastructure of the spermatozoon of Helicometroides atlanticus (Digenea, Monorchiidae), an intestinal parasite of Parapristipoma octolineatum (Pisces, Teleostei) in Senegal.
abstract: The mature Helicometroides atlanticus spermatozoon exhibits an anterior electron-dense material, two axonemes of the 9+"1" pattern, a nucleus, two mitochondria, extramembranous ornamentations located at the level of the first mitochondrion and cortical microtubules arranged into two fields: a ventral field corresponding to the mitochondrial side and a dorsal field corresponding to the nuclear side. It lacks of spine-like body and a cytoplasmic expansion as in Monorchis parvus the only species of Monorchioidea which spermatozoon has been described until now. Nevertheless, it is distinguished from M. parvus by the presence of an anterior electron-dense material and two axonemes which appear one after the other.
authors: Laboratory of Evolutionary Biology, Ecology and Management of Ecosystems, Faculty of Sciences and Techniques, Cheikh Anta Diop University of Dakar, Dakar, Senegal.
authors: P M
authors: PM
authors: Diagne
authors: CNRS - Università di Corsica, UMR 6134 - SPE, SERME Service d'Etude et de Recherche en Microscopie Electronique, 20250 Corte, Corsica, France. Electronic address: quilichini@univ-corse.fr.
authors: Y
authors: Y
authors: Quilichini
authors: Laboratory of Evolutionary Biology, Ecology and Management of Ecosystems, Faculty of Sciences and Techniques, Cheikh Anta Diop University of Dakar, Dakar, Senegal.
authors: C T
authors: CT
authors: Bâ
authors: Laboratory of Evolutionary Biology, Ecology and Management of Ecosystems, Faculty of Sciences and Techniques, Cheikh Anta Diop University of Dakar, Dakar, Senegal.
authors: P I
authors: PI
authors: Ndiaye
authors: Laboratory of Evolutionary Biology, Ecology and Management of Ecosystems, Faculty of Sciences and Techniques, Cheikh Anta Diop University of Dakar, Dakar, Senegal.
authors: A
authors: A
authors: Dione
authors: CNRS - Università di Corsica, UMR 6134 - SPE, SERME Service d'Etude et de Recherche en Microscopie Electronique, 20250 Corte, Corsica, France.
authors: B
authors: B
authors: Marchand
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000648:ultrastructure; D003593:Cytoplasm / Q000648:ultrastructure*; D008297:Male; D046529:Microscopy, Electron, Transmission; D008870:Microtubules / Q000648:ultrastructure*; D008928:Mitochondria / Q000382:microbiology / Q000648:ultrastructure*; D010473:Perciformes / Q000469:parasitology; D012675:Senegal; D013094:Spermatozoa / Q000382:microbiology / Q000648:ultrastructure*; D014200:Trematoda / Q000648:ultrastructure; D014201:Trematode Infections
keywords: Digenea; Helicometroides atlanticus; Monorchiidae; Spermatozoon; Ultrastructure