Abstract
Sexannulate Orobdella leech, Orobdella ijimai, is redescribed based on newly collected specimens from the type locality, Nikko, Tochigi Pref., Japan, since this species was originally described based on limited number of characters. In addition, two new sexannulate species, Orobdella dolichopharynx sp. nov. from Amamioshima Island in the Ryukyu Archipelago, Japan, and Orobdella shimadae sp. nov. from Okinawajima Island also in the Ryukyu Archipelago, are described. They resemble O. ijimai in the annulation of mid-body somites, but they differ from the latter in the annulation of somite VIII, position of gonopores, the lack of gastropore, the length of pharynx, the shape of gastroporal duct, and the morphology of male genital organ. Two new Orobdella species differ from each other in the annulation of somite VII, the position of gonopores, and the shape of gastroporal duct. In accordance with the two new species, the diagnosis of Orobdella is slightly emended.References
Gilyarov, M.S., Lukin, E.I. & Perel, T.S. (1969) The first terrestrial leech in fauna of the USSR, Orobdella whitmani Oka (Hirudinea, Herpobdellidae), a Tertiary relict of forests of the southern Maritime Region. Doklady Akademii Nauk SSSR, 188, 235–237.
International Commisson on Zoological Nomenclature. (1999) International Code of Zoological Nomenclature. International Trust for Zoological Nomenclature, London, 306 pp.
Lukin, E.I. (1976) Fauna USSR. Leeches. Nauka, Leningrad, 484 pp.
Moore, J.P. (1927) The segmentation (metamerism and annulation) of the Hirudinea. In: Harding, W.A. & Moore, J.P. The Fauna of British India, including Ceylon and Burma. Hirudinea. Taylor and Francis, London, pp. 1–12.
Moore, J.P. (1929) Leeches from Borneo with descriptions of new species. Proceedings of the Academy of Natural Sciences of Philadelphia, 81, 267–295.
Moore, J.P. (1935) Leeches from Borneo and the Malay Peninsula. Bulletin of the Raffles Museum, 10, 67–79.
Moore, J.P. (1946) Leeches (Hirudinea) from the Hawaiian Islands, and two new species from the Pacific region in the Bishop Museum Collection. Occasional Papers Bernice P. Bishop Museum, 18, 171–191.
Nakano, T. (2010) A new species of the genus Orobdella (Hirudinida: Arhynchobdellida: Gastrostomobdellidae) from Kumamoto, Japan, and a redescription of O. whitmani with the designation of the lectotype. Zoological Science, 27, 880–887.
Nakano, T. (2011) A new species of Orobdella (Hirudinida: Arhynchobdellida: Gastrostomobdellidae) from Tsushima Island, Japan. Species Diversity, 16, 39–47.
Oceguera-Figueroa, A., Phillips, A.J., Pacheco-Chaves, B., Reeves, W.K. & Siddall, M.E. (2011) Phylogeny of macrophagous leeches (Hirudinea, Clitellata) based on molecular data and evaluation of the barcoding locus. Zoologica Scripta, 40, 194–203.
Oka, A. (1895) On some new Japanese land leeches. (Orobdella nov. gen.). The Journal of the College of Science, Imperial University, Japan, 8, 275–306.
Oka, A. (1910a) Key to leeches from Japan. Doubutsugaku Zasshi, 22, 56–64.
Oka, A. (1910b) Synopsis der Japanischen Hirudineen, mit Diagnosen der Neuen Species. Annotationes Zoologicae Japonenses, 7, 165–183.
Oka, A. (1935) Apercu de la faune hirudinéenne japonaise. Proceedings of the Imperial Academy of Japan, 11, 240–241.
Oka, A. & Nagao, Z. (1965) Orobdella ijimai Oka. In: Okada, Y., Uchida, S. & Uchida, T. (Eds.) New Illustrated Encyclopedia of the Fauna of Japan, Part 1. Hokuryu-kan, Tokyo, pp. 574.
Richardson, L.R. (1971) Gastrostomobdellidae f. nov. and a new genus for the gastroporous Orobdella octonaria Oka, 1895, of Japan (Hirudinoidea: Arhynchobdellae). Bulletin of the National Science Museum (Tokyo), 14, 585–602.
Richardson, L.R. (1975) A new species of terricolous leeches in Japan (Gastrostomobdellidae, Orobdella). Bulletin of the National Science Museum Series A (Zoology), 1, 39–56.
Sawyer, R.T. (1986) Leech Biology and Behaviour. Clarendon Press, Oxford, 1065 pp.
Soós, Á. (1966) Identification key to the leech (Hirudinoidea) genera of the world, with a catalogue of the species. III. Family: Erpobdellidae. Acta Zoologica Academiae Scientiarum Hungaricae, 12, 371–407.