title: Reappraisal of Hydatigera taeniaeformis (Batsch, 1786) (Cestoda: Taeniidae) sensu lato with description of Hydatigera kamiyai n. sp.
abstract: The common cat tapeworm Hydatigera taeniaeformis is a complex of three morphologically cryptic entities, which can be differentiated genetically. To clarify the biogeography and the host spectrum of the cryptic lineages, 150 specimens of H. taeniaeformis in various definitive and intermediate hosts from Eurasia, Africa and Australia were identified with DNA barcoding using partial mitochondrial cytochrome c oxidase subunit 1 gene sequences and compared with previously published data. Additional phylogenetic analyses of selected isolates were performed using nuclear DNA and mitochondrial genome sequences. Based on molecular data and morphological analysis, Hydatigera kamiyai n. sp. Iwaki is proposed for a cryptic lineage, which is predominantly northern Eurasian and uses mainly arvicoline rodents (voles) and mice of the genus Apodemus as intermediate hosts. Hydatigera taeniaeformis sensu stricto (s.s.) is restricted to murine rodents (rats and mice) as intermediate hosts. It probably originates from Asia but has spread worldwide. Despite remarkable genetic divergence between H. taeniaeformis s.s. and H. kamiyai, interspecific morphological differences are evident only in dimensions of rostellar hooks. The third cryptic lineage is closely related to H. kamiyai, but its taxonomic status remains unresolved due to limited morphological, molecular, biogeographical and ecological data. This Hydatigera sp. is confined to the Mediterranean and its intermediate hosts are unknown. Further studies are needed to classify Hydatigera sp. either as a distinct species or a variant of H. kamiyai. According to previously published limited data, all three entities occur in the Americas, probably due to human-mediated introductions.
authors.affiliation: Department of Bacteriology and Immunology/Immunobiology Research Program, Faculty of Medicine, P.O. Box 21, FI-00014 University of Helsinki, Finland. Electronic address: antti.lavikainen@helsinki.fi.
authors.forename: Antti
authors.initials: A
authors.lastname: Lavikainen
authors.affiliation: Meguro Parasitological Museum, Shimomeguro, Meguro-ku, Tokyo 153-0064, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Iwaki
authors.affiliation: Finnish Museum of Natural History Luomus, P.O. Box 17, FI-00014 University of Helsinki, Finland.
authors.forename: Voitto
authors.initials: V
authors.lastname: Haukisalmi
authors.affiliation: Institute Systematics and Ecology of Animals, Siberian Branch Russian Academy of Sciences, Novosibirsk 630091, Russia.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Konyaev
authors.affiliation: University of Milano-Bicocca, ZooPlantLab, Department of Biotechnology and Biosciences, Piazza della Scienza 2, 20126 Milano, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Casiraghi
authors.affiliation: Institute of Biological Problems of the North, Far East Branch, Russian Academy of Sciences, Magadan 685000, Russia.
authors.forename: Nikolai E
authors.initials: NE
authors.lastname: Dokuchaev
authors.affiliation: University of Milano-Bicocca, ZooPlantLab, Department of Biotechnology and Biosciences, Piazza della Scienza 2, 20126 Milano, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Galimberti
authors.affiliation: Department of Biodiversity (Zoology), University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa.
authors.forename: Ali
authors.initials: A
authors.lastname: Halajian
authors.affiliation: Natural Resources Institute Finland, Vantaa Unit, P.O. Box 18, FI-01301 Vantaa, Finland.
authors.forename: Heikki
authors.initials: H
authors.lastname: Henttonen
authors.affiliation: Laboratory of Veterinary Parasitology, Faculty of Agriculture, Iwate University, Ueda 3-18-8, Morioka 020-8550, Japan.
authors.forename: Madoka
authors.initials: M
authors.lastname: Ichikawa-Seki
authors.affiliation: Laboratory of Veterinary Parasitology, Faculty of Agriculture, Iwate University, Ueda 3-18-8, Morioka 020-8550, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Itagaki
authors.affiliation: Institute Systematics and Ecology of Animals, Siberian Branch Russian Academy of Sciences, Novosibirsk 630091, Russia.
authors.forename: Anton V
authors.initials: AV
authors.lastname: Krivopalov
authors.affiliation: Department of Bacteriology and Immunology/Immunobiology Research Program, Faculty of Medicine, P.O. Box 21, FI-00014 University of Helsinki, Finland.
authors.forename: Seppo
authors.initials: S
authors.lastname: Meri
authors.affiliation: CNRS-CIRAD, Centre d'Infectiologie Christophe Mérieux du Laos, P.O. Box 3888, Vientiane, Lao Democratic People's Republic.
authors.forename: Serge
authors.initials: S
authors.lastname: Morand
authors.affiliation: Department of Veterinary Biosciences, Faculty of Veterinary Medicine, P.O. Box 66, FI-00014 University of Helsinki, Finland.
authors.forename: Anu
authors.initials: A
authors.lastname: Näreaho
authors.affiliation: Department of Wildlife, Fish, and Environmental Studies, Faculty of Forest Sciences, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden.
authors.forename: Gert E
authors.initials: GE
authors.lastname: Olsson
authors.affiliation: Biodiversity Research Group, Faculty of Science, Udon Thani Rajabhat University, 41000 Udon Thani, Thailand; Laboratory of Parasitology, Faculty of Pharmacy, University of Barcelona, Avda Diagonal s/n, 08028 Barcelona, Spain.
authors.forename: Alexis
authors.initials: A
authors.lastname: Ribas
authors.affiliation: College of Veterinary Medicine, Haramaya University, P.O. Box 138, Dire Dawa, Ethiopia.
authors.forename: Yitagele
authors.initials: Y
authors.lastname: Terefe
authors.affiliation: Department of Parasitology, Asahikawa Medical University, Asahikawa, Hokkaido 078-8510, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Nakao
mesh_terms: D000349:Africa; D000818:Animals; D003411:Arvicolinae; D001208:Asia; D001315:Australia; D001499:Bayes Theorem; D002371:Cat Diseases / Q000469:parasitology*; D002415:Cats; D002589:Cestoda / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics; D002590:Cestode Infections / Q000469:parasitology / Q000662:veterinary*; D058893:DNA Barcoding, Taxonomic / Q000662:veterinary; D018509:DNA, Helminth / Q000737:chemistry; D003576:Electron Transport Complex IV / Q000235:genetics; D005060:Europe; D045989:Felidae / Q000469:parasitology*; D051379:Mice; D008928:Mitochondria / Q000201:enzymology / Q000235:genetics; D051189:Murinae; D010802:Phylogeny; D058974:Phylogeography; D051381:Rats; D012376:Rodent Diseases / Q000469:parasitology*
chemical_list: D018509:DNA, Helminth; D003576:Electron Transport Complex IV
keywords: Cryptic species; Hydatigera kamiyai n. sp.; Hydatigera taeniaeformis; Phylogeny; Taeniidae