Description of Two New Species of Free-Living Nematodes (Nematoda) from Vietnam
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IOLOGY, MORPHOLOGY, AND SYSTEMATICS OF HYDROBIONTS
Description of Two New Species of Free-Living Nematodes (Nematoda) from Vietnam Nguyen Dinh Tua and V. G. Gagarinb, * a
Institute of Ecology and Biological Resources, Vietnamese Academy of Sciences and Technology, Hanoi, Vietnam bPapanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouzskii raion, Yaroslavl oblast, Russia *e-mail: [email protected] Received October 5, 2018; revised April 9, 2019; accepted September 23, 2019
Abstract—An illustrated description of two free-living nematode species—Leptolaimoides brevicaudatus sp. n. and Paramonhystera affinis sp. n.—from the water bodies of Vietnam is presented. L. brevicaudatus is similar to L. thermastris (Lorenzen, 1966); L. gangioensis Hoang Lai-Phu et al., 2009; and L. asiaticus Gagarin, Nguyen Vu Thanh, 2005 in regards to body size, but differs from these species by a shorter and less slender body, longer spicules, and the absence of precloacal supplements in males. Paramonhystera affinis sp. n. is morphologically similar to P. parabutschlii (Timm, 1961) and P. levicula (Lorenzen, 1972), but it has shorter and sparse somatic setae, six outer labial setae (versus four outer labial setae in both compared species), and shorter spicules. Keywords: Vietnam, water bodies, free-living nematodes, new species DOI: 10.1134/S1995082920030141
INTRODUCTION The study of the fauna of free-living nematodes in the water bodies and watercourses in Vietnam began about 15 years ago in order to develop a database on the aquatic fauna of Vietnam. In recent years, largescale studies on the fauna of this taxonomic group have been performed. The data on their fauna in fresh water bodies and mangroves are summarized in the works of Gagarin and Gusakov (Gusakov and Gagarin, 2017; Gagarin, 2018). This study aims to give an illustrated description of two species of free-living nematodes new to science. MATERIALS AND METHODS Twenty-four samples of nematodes were collected in March 2017 by colleagues from the Institute of Ecology and Biological Resources of the Vietnam Academy of Sciences and Technologies (Hanoi, Vietnam) in the bottom sediments of an artificial pond for shrimp aquaculture. This water body is located in the Quảng Ninh Province on an island in the South China Sea off the coast of Vietnam. Its area is 1000 m2. The bottom is overgrown by dense thickets of grass HalophAbbreviations: (a) ratio of body length to its width; (b) ratio of body length to pharynx length; (c) ratio of body length to tail length; (c') ratio of tail length to body width in the anus or cloaca area; (L) body length, mm; and (V) the ratio of the distance from vulva to the anterior end of the body to the body length, %.
ila beccarii Ascherso, 871 and Ruppia maritima L., 1953. Material was also collected in the estuaries of the Van Uc River and Ien River in the mangroves. Samples were taken at a depth of 0.3–0.7 m using a cylinder with a diameter of 3.5 cm, a length of 10 cm, and washed through a sieve with a mesh diameter of 0
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