中文摘要：

发现描述了中国东海潮间带和潮下带自由生活线虫三个新记录.近似双色矛线虫Dichromadora affinis Gagarin et Thanh,2011：标本个体较小,角皮具环纹并具由两纵排大圆点组成的侧装饰,头刚毛较短,口腔内具一明显的大背齿,咽具有显著的圆球形后咽球,无前咽球,无肛前辅器,交接刺和引带较短.该标本特征与发现于越南的模式种的特征高度一致.细尾长颈线虫Cervonema tenuicauda Stekhoven,1950：标本头刚毛4微米,螺旋化感器5.5-6圈,交接刺直,约1倍肛径长,7-8个小的肛前辅器,尾6-7.1倍肛径长,锥状部分占42-48%,丝状部分占62-68%.特征符合该种的原始描述.安氏雷曼线虫,Laimella annae Chen et Vincx,2000：标本头径宽9-11微米,头刚毛9微米,化感器直径7微米,交接刺1.5倍于肛径宽,尾细长,14-17倍于肛径宽,锥状部分占25%,丝状部分占75%,5个肛前辅器.除交接刺稍长外本标本特征较符合该种的原始描述。

英文摘要：

Three new records of free-living nematodes Dichromadora a f finis Gagarin et Thanh, 2011, Cervonema tenuicauda Stekhoven, 1950,Lairnellaannae Chen et Vincx, 2000 are described. Dichromadora a f fin isis characterized by the combination of set off head; spherical posterior pharyngeal bulb; absence of anterior pharyngeal bulb; absence of precloacal supple- ments; spicules with cephalate proximally and swelling distally. Our specimens are in full a- greement with Gagarin＇s original description from Red River Mouth in Vietnam, but only spic- ules are slightly longer. Cervonema tenuicauda is characterized by cephalic setae 4 μm long; amphids spiral with 5.5-6 turns, 10 μm in diameter; anterior border located 18-20 μm behind the front end, or 2 h. d. ; spicules almost straight, one a. b. d. long; gubernaculum small; 7-8 minute precloacal supplements; tail 6-7.1 a. b. d. long with 62-68% of posterior filiform part. The present specimens agree well with the description by Chen ＆Vincx in 2000. However, the body length of our specimens is larger than the original description by Stekhoven in 1950 （1 130-1 270 μm vs. 820 μm in female）. Laimella annae is characterized by the head diameter 9- 11 μm; cephalic setae and external labial setae 9＋5 μmlong; amphids 7μm in diameter or 70% c. b. d. ; spicules 1.5 a. b. d. ; tail 14-17 a. b. d. and 75% posterior part fifliform; five precloa- cal supplements. The present specimens fit well with the original description except the spic- ules slightly longer and the length of tail posterior filiform part larger.