A New Species of <i>Rhabdias</i> (Nematoda: Rhabditida: Rhabdiasidae) from Miyakojima Island, Okinawa, Japan

Abstract

20DE-449A-844A-CC7F6D697444A new nematode species that is lung parasitic to a bufonid toad, Rhabdias kafunata sp. nov., is described and illustrated from Miyakojima island, Okinawa Prefecture, Japan. Although the new species was previously identified as R. incerta Wilkie, 1930, it is clearly distinguishable from that species by the characteristics of body proportion, buccal capsule, and esophagus. Additionally, the new species differs from other congeners inhabiting East Asia and the Russian Far East in the following features: longer body length, cup-like buccal capsule, longer esophagus length, presence of thickened anterior muscular part in esophagus, cuticular inflation less prominent in region posterior to small cephalic cuticular inflation, middle part of body and tail tip, and tail long and tapering. Partial sequences of mitochondrial cytochrome c oxidase subunit I and 12S rDNA genes were provided as DNA barcodes for the new species.

Description of a New Species of <i>Rhabdias</i> (Nematoda: Rhabditida: Rhabdiasidae) from Ishigakijima Island, Okinawa, Japan

“…nov. can be discriminated from the other 11 congeners recorded from East Asia and the Russian Far East as follows. The new species, of which body length ranges from 4.14 to 7.07 mm, can be distinguished from the following five Rhabdias species: R. bicornis Lu, 1934 (13.056-15.428 mm;Lu 1934), R. incerta Wilkie, 1930 (14.3 mm;Wilkie 1930), R. kafunata Sata, Takeuchi, and Nakano, 2020 (10.99-16.77 mm;Sata et al 2020), R. rhacophori Yamaguti, 1941 (10.55 mm;Yamaguti 1941) and R. tokyoensis Wilkie, 1930 (12 mm;Wilkie 1930). Rhabdias kiri sp.…”

“…The genus consists of ca. 85 nominal species that are distributed worldwide (Kuzmin 2013), and eight of these species have been recorded in the Japanese and Ryukyu Archipelagos, Japan (Wilkie 1930;Yamaguti 1935Yamaguti , 1941Yamaguti , 1954Hasegawa 1984Hasegawa , 1989Hasegawa , 1990Hasegawa and Iwatsuki 1993;Goldberg et al 1997;Goldberg and Bursey 2002;Kuzmin 2003Kuzmin , 2013Hasegawa and Asakawa 2004;Sata et al 2020).…”