Three New Records of Free-living Nematodes from the East China Sea ①

GAO Qun; HUANG Yong

doi:10.3969/j.issn.1672-6634.2015.03.009

Abstract：Three new records of free‐living nematodes Dichromadora af f inis Gagarin et Thanh ,2011 ,Cervonema tenuicauda Stekhoven ,1950 ,Laimellaannae Chen et Vincx ,2000 are described .Dichromadora af f in 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) .L aimella annae is characterized by the head diameter 9‐11 μm ;cephalic setae and external labial setae 9+5μmlong ;amphids 7 μm 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 .