title: Spermatozoon ultrastructure of Thysanotaenia congolensis (Cyclophyllidea, Anoplocephalidae, Inermicapsiferinae): phylogenetic implications.
abstract: The mature spermatozoon of Thysanotaenia congolensis, an intestinal parasite of black rat Rattus rattus from Cape Verde, is described by means of transmission electron microscopy. The ultrastructural organization of the sperm cell of T. congolensis follows Levron et al.'s type VII of the Eucestoda. It corresponds to a uniflagellate spermatozoon that presents crested bodies, periaxonemal sheath and intracytoplasmic walls, spiralled cortical microtubules and nucleus spiralled around the axoneme. These characteristics are also present in the spermatozoa of other inermicapsiferines and differ from the characters found in species belonging to the remaining subfamilies of anoplocephalids, namely Anoplocephalinae, Linstowiinae and Thysanosomatinae. Several authors consider the family Anoplocephalidae as a polyphyletic group, and its relationships with the Davaineidae are a matter of controversy. The phylogenetic implications of spermatological ultrastructural features present in inermicapsiferines and in the remaining anoplocephalids are discussed, and the available data on anoplocephalids are compared to similar results in davaineids in order to contribute to a better knowledge of relationships between these cyclophyllidean families.
authors.affiliation: Secció de Parasitologia, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències de l'Alimentació, Universitat de Barcelona, Av. Joan XXIII, sn, 08028, Barcelona, Spain. jordimiquel@ub.edu.|Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona, Av. Diagonal, 645, 08028, Barcelona, Spain. jordimiquel@ub.edu.
authors.forename: Jordi
authors.initials: J
authors.lastname: Miquel
authors.affiliation: W. Stefański Institute of Parasitology, Polish Academy of Sciences, 51/55 Twarda Street, 00-818, Warszawa, Poland.
authors.forename: Zdzisław
authors.initials: Z
authors.lastname: Świderski
authors.affiliation: Secció de Parasitologia, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències de l'Alimentació, Universitat de Barcelona, Av. Joan XXIII, sn, 08028, Barcelona, Spain.|Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona, Av. Diagonal, 645, 08028, Barcelona, Spain.
authors.forename: Carlos
authors.initials: C
authors.lastname: Feliu
mesh_terms: D000818:Animals; D054468:Axoneme / Q000502:physiology / Q000648:ultrastructure*; D002467:Cell Nucleus; D002589:Cestoda / Q000145:classification*; D002590:Cestode Infections / Q000469:parasitology; D007411:Intestinal Diseases, Parasitic / Q000469:parasitology*; D008297:Male; D046529:Microscopy, Electron, Transmission; D008870:Microtubules / Q000502:physiology; D010802:Phylogeny; D051381:Rats; D013091:Spermatogenesis / Q000502:physiology; D013094:Spermatozoa / Q000648:ultrastructure*
keywords: Anoplocephalidae; Cestoda; Cyclophyllidea; Inermicapsiferinae; Sperm characters; Thysanotaenia congolensis; Ultrastructure