title: Spermatozoon ultrastructure and phylogenetic relationships in the monogeneans (Platyhelminthes).
mesh_terms: D000818:Animals; D008297:Male; D008854:Microscopy, Electron; D010802:Phylogeny; D010986:Platyhelminths / Q000235:genetics*; D013045:Species Specificity; D013094:Spermatozoa / Q000648:ultrastructure*