渤海自由生活海洋线虫两个新纪录种

在对渤海滨州贝壳堤岛的自由生活海洋线虫进行分类和多样性研究中,发现2个我国新纪录种并进行了描述。其中,澳洲深咽线虫Bathylaimus australis Cobb,1894主要特征为:头刚毛长约20μm,分为4节,顶端膨大;前口腔大,无齿,后口腔小,具小齿;化感器双环形,位于口腔中部位置;交接刺细长,稍向腹面弯曲,近端膨大呈头状,长32-37μm;引带宽大,肾形,长36-40μm,末端角质化,渐尖。古氏努朵拉线虫Nudora gourbaultae Vincx,1989主要特征为:体表具12列纵向排列的V型装饰;第二体环较宽,头刚毛11-15μm(为头颈的67%-81%);化感器圆形,直径4-6μm(为相应体径的29%-38%),位于第二体环上;具双咽球;交接刺细长,弯曲呈S型,长为肛径的1.3-1.5倍;引带等于或长于交接刺,镰刀型,无肛前辅器。

TWO NEW RECORD SPECIES OF FREE-LIVING MARINE NEMATODES FROM BOHAI SEA, CHINA

Two new records of free-living marine nematode species discovered from marine sediments in Bohai Sea,North China were described.Bathylaimus australis Cobb,1894 is characterized by smooth cuticle with short somatic setae.Cephalic setae thick and strong,comprised of four segments.Buccal cavity large,bipartite without tooth.Amphideal fovea circular,20μm from anterior end,positioned over posterior half of the anterior portion of buccal cavity.Spicules 32—37μm long,gubernaculum 36—40μm long.Female with two opposed,reflexed ovaries.Vulva situated at mid-body.Nudora gourbaultae Vincx,1989 is characterized by cuticle coarsely annulated.The first and second annuli are broader and form a kind of a cephalic capsule.Twelve longitudinal rows of V-markings(costae)are present.The six internal labial papillae,the six outer labial sensilla setiform(2μm long)are situated in the middle part of the lips.The four cephalic setae 11—15μm long and situated at the basis of the lip region.Somatic setae are scarce.The amphideal fovea circular situated on the second annulus.The buccal cavity cylindrical and heavily sclerotized with a big dorsal tooth.Pharynx with a prominent anterior bulb and an elongated terminal bulb that is divided into two parts.Male diorchic with both testes.Spicules slender with a typical proximal bent.Gubernaculum falciform,well-developed and longer than the spicules.Female monodelphic,vulva close to anus.