Description of a New Species of Longidorus (Dorylaimida: Longidoridae) from Ishigaki Is., Japan

摘要

A new Longidorus species collected from the rhizosphere of Pleioblastus linearis (Gramineae) in Ishigaki Is., Okinawa Prefecture, Japan is described and illustrated. L. ishi-gakiensis n. sp. is characterized by the continuous lip region, bluntly rounded tail, long odontostyle (172 (158-181) μm), and extremely posteriorly located guiding ring (90.7 (83.1-94. 6) μm). This new species resembles L. lands Hirata, 1995, L. litchii Xu and Cheng, 1992, L. naganensis Hirata, 1995 and L. orongorongensis Yeates, Van Etteger and Hooper, 1992, in long odontostyle and especially posterior position of guiding ring, but differs from L. litchii in having larger c' value and longer tail length in female, and rounded tail of the first-stage juvenile, from the otherthree species in having larger c' value and narrower lip region width. Juveniles of this new species are separated into three developmental stages based on the lengths of bodies, odontostyles and replacement odontostyles.