Abstract

An illustrated description of two nematode species (D. lutosum sp. n. and D. stagnalis sp. n.) of the genus Daptonema Cobb, 1920, found in artificial reservoirs for shrimp farming in Vietnam and new to science, is provided. D. lutosum sp. n. is similar to D. borealis Gagarin, 2020 and D. dihystera Gagarin, Nguyen Vu Thanh, 2005 in the structure of the specular apparatus and body sizes. It differs from D. borealis Gagarin, 2020 in longer outer labial setae, amphidial foveae extending from the anterior body end, shorter spicules, and the posterior uterus present in females. It differs from D. dihystera Gagarin, Nguyen Vu Thanh, 2005 in a shorter pharynx, longer outer labial setae, amphidial fovea extending from the body anterior end, and longer terminal setae at the tail tip. D. stagnalis sp. n. is most similar to D. dihystera and D. lutosum sp. n. in the structure of the spicule apparatus and body size. It differs from both species in a thicker body, a thicker tail, and the lack of a posterior uterus in females. A table of the main morphometric traits of males of the valid species identified to the swalbardensis species group of the genus Daptonema is given.

中文翻译：

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在越南人工水库中发现的两种新线虫属 Daptonema (Nematoda, Monhysterida)

摘要

提供了对Daptonema Cobb属的两种线虫物种（D. lutosum sp. n. 和D. stagnalis sp. n.）的图解描述，该物种于1920 年在越南人工养虾水库中发现，并且是科学界的新物种。D. lutosum sp. n. 与D. borealis Gagarin, 2020 和D. dihystera Gagarin, Nguyen Vu Thanh, 2005 在镜面反射装置的结构和身体尺寸方面相似。它与D. borealis Gagarin, 2020 的不同之处在于更长的外唇刚毛、从身体前端延伸的两栖中心凹、更短的针刺和女性存在的后子宫。它不同于D. dihysteraGagarin, Nguyen Vu Thanh, 2005 在较短的咽部、较长的外唇刚毛、从身体前端延伸的两栖中央凹和较长的尾端末端刚毛。D. stagnalis sp。n. 与D. dihystera和D. lutosum sp.最相似。n. 在骨刺器的结构和体型上。它与两个物种的不同之处在于更厚的身体、更粗的尾巴以及雌性缺乏后子宫。鉴定到种swalbardensis组属有效物种的雄性的主要形态性状的表Daptonema中给出。