title: Ultrastructure of the spermatozoon of the digenean Lecithocladium excisum (Rudolphi, 1819) (Hemiuroidea: Hemiuridae), a parasite of marine teleosts in Senegal.
abstract: The present study describes the ultrastructure of the mature spermatozoon of Lecithocladium excisum (Rudolphi, 1819) (Digenea: Hemiuroidea: Hemiuridae) from the stomach of the marine teleost Scomber japonicus Houttuyn (Scombridae) captured in the Atlantic Ocean, off Dakar (Senegal). The ultrastructural organization of the spermatozoon of L. excisum follows the general model described in most digeneans. It presents two axonemes of the 9+'1' pattern of the Trepaxonemata, nucleus, mitochondrion and parallel cortical microtubules, among other characters. However, some particularities of the spermatozoon of L. excisum are (i) the presence of a membranous ornamentation not associated with cortical microtubules in its anterior extremity, (ii) the presence of a very reduced number of cortical microtubules located only in the ventral side of the spermatozoon and (iii) the absence of several structures described in most digeneans such as spine-like bodies and cytoplasmic expansions.
authors.affiliation: Laboratory of Evolutionary Biology, Ecology and Management of Ecosystems, Faculty of Sciences and Techniques, Cheikh Anta Diop University of Dakar, BP 5055, Dakar, Senegal.
authors.forename: Papa Ibnou
authors.initials: PI
authors.lastname: Ndiaye
authors.forename: Papa Mbagnick
authors.initials: PM
authors.lastname: Diagne
authors.forename: Aminata
authors.initials: A
authors.lastname: Sène
authors.forename: Abdoulaye J S
authors.initials: AJ
authors.lastname: Bakhoum
authors.forename: Jordi
authors.initials: J
authors.lastname: Miquel
mesh_terms: D000818:Animals; D001267:Atlantic Ocean / Q000453:epidemiology; D005393:Fish Diseases / Q000453:epidemiology / Q000469:parasitology*; D005399:Fishes; D008297:Male; D012675:Senegal / Q000453:epidemiology; D013094:Spermatozoa / Q000648:ultrastructure*; D014200:Trematoda / Q000648:ultrastructure*