title: Resurrection of Proteocephalus sagittus (Grimm, 1872) (Cestoda: Proteocephalidea) based on morphological and molecular data.
abstract: This paper presents a redescription of the proteocephalidean cestode Proteocephalus sagittus (Grimm, 1872) based on freshly collected specimens from the type-host, the stone loach Barbatula barbatula (L.) (family Balitoridae), from the Czech Republic. This species has recently been synonymised with P. torulosus (Batsch, 1786), a parasite of cyprinid fishes in the Holarctic Region, but it differs in the following characters: (i) scolex morphology (scolex rounded, with more apically situated suckers and lacking longitudinal wrinkles in P. sagittus versus large and club-shaped, with more laterally situated suckers and longitudinal wrinkles in P. torulosus); (ii) position of the vagina (opens anterior to the cirrus-sac in P. sagittus versus overlapping its distal region dorsally in P. torulosus); (iii) length of the cirrus-sac (shorter in P. sagittus); (iv) osmoregulatory canals (more distinct and situated more laterally, but almost indistinguishable and more medial in P. torulosus); and (v) sequences of the partial 18S rRNA (V4 region - 96.9% similarity) and 5.8S-ITS2 genes (65.9% similarity). P. pamirensis Dzhalilov & Ashurova, 1971, a poorly described species from the Tibetan stone loach Noemacheilus stoliczkai[= Tryplophysa stoliczkae (Steindachner)] in Tadjikistan, is synonymised with P. sagittus.
authors.affiliation: Institute of Parasitology, Academy of Sciences of the Czech Republic & Faculty of Biological Sciences, University of South Bohemia, Branisovská 31, 370 05 Ceské Budejovice, Czech Republic.
authors.forename: Tomás
authors.initials: T
authors.lastname: Scholz
authors.forename: Andrea
authors.initials: A
authors.lastname: Skeríková
authors.forename: Vladimíra
authors.initials: V
authors.lastname: Hanzelová
authors.forename: Bozena
authors.initials: B
authors.lastname: Koubková
authors.forename: Vlastimil
authors.initials: V
authors.lastname: Barus
mesh_terms: D000818:Animals; D001483:Base Sequence; D002589:Cestoda / Q000033:anatomy & histology / Q000235:genetics* / Q000648:ultrastructure; D003531:Cypriniformes / Q000469:parasitology*; D018509:DNA, Helminth / Q000737:chemistry / Q000235:genetics; D005260:Female; D008297:Male; D008855:Microscopy, Electron, Scanning; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012337:RNA, Ribosomal, 18S / Q000737:chemistry / Q000235:genetics; D016415:Sequence Alignment
chemical_list: D018509:DNA, Helminth; D012337:RNA, Ribosomal, 18S