Some Spirurid Nematodes (Spirurida) from Freshwater and Brackish-Water Fishes in Okinawa Prefecture, Japan, with Descrip
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ORIGINAL PAPER
Some Spirurid Nematodes (Spirurida) from Freshwater and Brackish‑Water Fishes in Okinawa Prefecture, Japan, with Descriptions of Two New Species František Moravec1 · Kazuya Nagasawa2 Received: 7 July 2020 / Accepted: 11 August 2020 © Witold Stefański Institute of Parasitology, Polish Academy of Sciences 2020
Abstract Purpose Despite the fact that Okinawa Prefecture represents a very interesting subtropical region of Japan, its fauna of nematodes parasitizing fishes is still little-known. Therefore, new data are needed to recognize the species composition of these parasites in this zoogeographically remarkable region. Methods Helminthological examinations of some freshwater and brackish-water fishes in Okinawa Prefecture carried out in the years 2010, 2016 and 2018, revealed two new and four insufficiently known species of spirurid nematodes (Spirurida), all gastrointestinal parasites. These were studied with the use of light and scanning electron microscopy. Results All nematode species recorded are described: Rhabdochonidae: Rhabdochona honshuensis Moravec et Nagasawa, 1989 from Glossogobius celebius (Valenciennes) (Gobiidae, Perciformes) (new host), Rhabdochona iriomotensis sp. nov. from Ophieleotris sp. (Eleotridae, Perciformes) and Rhabdochona sp. (only females) from Eleotris acanthopoma Bleeker and E. fusca (Forster) (both Eleotridae, Perciformes); Cystidicolidae: Spinitectus mirabilis sp. nov. from Kuhlia rupestris (Lacepède) (Kuhliidae, Perciformes) and Spinitectus sp. larvae from E. acanthopoma; and Camallanidae: Procamallanus (Spirocamallanus) sp. (fourth-stage larva) from Yongeichthys criniger (Valenciennes) (Gobiidae, Perciformes). Rhabdochona iriomotensis sp. nov. is very similar to R. honshuensis, but differs from it in the presence of well-developed ventral precloacal ridges. Spinitectus mirabilis sp. nov. differs from its congeners and all other cystidicolids in having eggs provided with both lateral swellings and polar filaments. Conclusions In addition to the discovery of two new nematode species, Rhabdochona iriomotensis sp. nov. and Spinitectus mirabilis sp. nov., the findings of all other species represent new host and geographical records. Rhabdochona denudata honshuensis Moravec et Nagasawa, 1989 is elevated to the level of an independent species R. honshuensis. Keywords Parasitic nematode · Rhabdochona · Spinitectus · Procamallanus (Spirocamallanus) · Fish · East Asia
Introduction Okinawa Prefecture is located in the subtropical region and represents a very interesting region of Japan from the zoogeographical point of view. Despite this fact, its fauna of nematodes parasitizing fishes is still little-known. Most * František Moravec [email protected] 1
Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05 České Budějovice, Czech Republic
Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi‑Hiroshima, Hiroshima 739‑8528, Japan
2
of the available data were provided by Hasegawa et al. [1],
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