| 摘要: |
| 在2021年春季对广西北海金海湾红树林保护区的自由生活海洋线虫进行分类和多样性研究中发现联体线虫属（Comesoma）国内2个新记录种，分别为百慕大联体线虫（Comesoma bermudense）和赫尔曼联体线虫（Comesoma hermani），并对其特征进行了描述与图示。百慕大联体线虫主要特征为：4根头刚毛，长度为21~31 μm，4根亚头刚毛，长度为5~7 μm；虫体表皮具横排的侧分化点纹，颈部有不规则排列的颈刚毛；口腔前部膨大，底部角质化；螺旋状化感器，2.5圈；两条细长的交接器，弧长189~200 μm，引带没有突起，肛前附器乳突状；金海湾标本交接器弦长与尾长之比为0.7~0.9，大于其模式种的0.4~0.6。赫尔曼联体线虫主要特征为：口腔前部呈杯状，基部加厚，后部狭窄；螺旋状化感器，2.5圈；两条细长的交接器，弧长187~192 μm，引带没有突起；金海湾标本雄性体长约为2.2~2.4 mm，大于模式种的1.7~2.1 mm。该属物种在红树林湿地为首次报道。 |
| 关键词: 海洋生物学 自由生活海洋线虫 分类 百慕大联体线虫 赫尔曼联体线虫 南海 |
| DOI：10.3969/J.ISSN.2095-4972.2023.01.002 |
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| 基金项目:国家自然科学基金资助项目（31772416） |
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| Two new recorded species of marine free-living nematodes (Comesoma) from Jinhai Bay Mangrove Reserve, Beihai, Guangxi |
| WANG Yue,GUO Yuqing |
| (Fisheries College, Jimei University, Xiamen 361021, China) |
| Abstract: |
| Two new records of free-living marine nematodes, Comesoma bermudense and Comesoma hermani, were found and described during the taxonomy and diversity study in the Jinhai Bay Mangrove Reserve, Beihai, Guangxi, in spring 2021. C. bermudense is characterized by four cephalic setae 21-31 μm in length and four subcephalic setae 5-7 μm in length. Its cervical setae are arranged irregularly and transverse rows with lateral differentiation dotted on the cuticle. The buccal cavity is cup-shaped and posteriorly cuticularized. Amphid spirals 2.5 turns. Two spicules are equal, 187-192 μm in arc length, with no apophysis on the gubernaculum. The male has papillary precloacal supplements.The ratio of spicules to tail length is 0.7-0.9, longer than the type species (0.4-0.6) described by Jensen & Gerlach. The other species, C. hermani is characterized by buccal cavity of two obvious chambers. The anterior chamber is cupshaped with cuticularized base and the posterior chamber is narrow. Amphid spirals 2.5 turns. Two slender needlelike spicules are equal, 187-192 μm in arc length, with no apophysis on the gubernaculum. There are setae before the cloaca. The male body length of the Jinhai Bay specimen is 2.2-2.4 mm, longer than the type species (1.7-2.1 mm) described by Chen & Vincx. These two species are first reported in the mangrove wetland. |
| Key words: marine biology free-living marine nematode taxonomy Comesoma bermudense Comesoma hermani South China Sea |
