| LIN Junhui,WANG Jianjun,ZHENG Fengwu. 2018. Mediomastus chinensis sp. nov., a new species of Capitellidae (Annelida: Polychaeta) from the southeast coast of China. Acta Oceanologica Sinica, 37(10):126－129 |
| Mediomastus chinensis sp. nov., a new species of Capitellidae (Annelida: Polychaeta) from the southeast coast of China |
| 中国东南沿海小头虫科(环节动物:多毛类)一新种 |
| Received:September 19, 2017 |
| DOI：10.1007/s13131-018-1316-z |
| Key words:Mediomastus Capitellidae polychaeta new species taxonomy China |
| 中文关键词: 中蚓虫 小头虫科 多毛类 新种 分类 中国 |
| 基金项目:The Public Science and Technology Research Funds Projects of Ocean under contract No. 201505004. |
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| Abstract: |
| Mediomastus is a common genus around the world, and Chinese specimens used to be identified as M. californiensis Hartman. In this study, 118 Mediomastus specimens collected from four localities along the southeast coast of China were examined. They belonged to an unknown species. We treat them as a new species, described herein. The new species is characterized as follows: (1) chaetigers 1–9 biannulate with chaetal fascicles at midsegment, thereafter multiannulate with chaetal fascicles posterior to midsegment; (2) parapodial ridges on posterior abdomen; (3) possession of bilimbate capillary chaetae on chaetigers 1–4; (4) thoracic hooks with long, straight shaft, hood length about 3–5 times width; (5) abdominal hooks shorter, with developed shoulder and distinct constriction, markedly different from those in thorax; (6) unique staining pattern with methyl green. The present study indicated that Mediomastus species inhabiting Chinese waters might be misidentified as M. californiensis, and that Mediomastus chinensis sp. nov. is widely distributed along the southeast coast of China. |
| 中文摘要: |
| 中蚓虫是小头虫科较为常见的属，中国海区的样品过去常被鉴定为加洲中蚓虫Mediomastus californiensis Hartman。本研究中，来自东南沿海四个不同海区的118条中蚓虫样品被鉴定为一个新的种类，在此给出具体描述。这个新种具有如下特征：（1）第1至9刚节表皮双环型，刚毛束位于体节中间位置，而后的刚节多环型，刚毛束位于体节后半部；（2）后腹区具有疣足突起；（3）前4个胸刚节仅具双羽型翅毛状刚毛，其它体节仅具巾钩刚毛；（4）胸区巾钩刚毛的柄长且直，巾长为宽的3至5倍；（5）腹区巾钩刚毛不同于胸区，较短且具收缩部；（6）甲基绿染色模式独特。这个研究表明了中国海区的中蚓虫可能被误鉴定为加洲中蚓虫，而这个新种M.chinensis sp.nov.在东南沿海广为分布。 |
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