(Table 1) Diagnostic characters of specimens of Marenzelleria bastropi sp. n., M. arctia, M. neglecta, M. viridis and M. wireni

Marenzelleria bastropi, a new species of Spionidae (Polychaeta) from the brackish water Currituck Sound, North Carolina, is described. The new species is characterized by the great number of chaetigers between the first neuro- and notopodial hooded hooks, the extension of the nuchal organ up to the end of chaetiger 2/middle of chaetiger 3 and the presence of about 60-90 branchiate chaetigers. Marenzelleria bastropi sp. nov. is closely related to M. neglecta (Sikorski and Bick, 2004) and Marenzelleria viridis (Verrill, 1873). Marenzelleria wireni Augener, 1913 is described here for the first time from western Spitsbergen. Adult specimens are investigated and compared with specimens from other areas of distribution. A key for subadult and adult specimens of all Marenzelleria species is provided.

本文记述了产自美国北卡罗来纳州咸淡水水域卡里特克潟湖的海稚虫科（Spionidae）多毛纲（Polychaeta）一新种——Marenzelleria bastropi。该新种的鉴别特征为：第一腹疣足（neuropodium）具鞘钩毛与第一背疣足（notopodium）具鞘钩毛之间的刚节（chaetiger）数量众多；颈器（nuchal organ）延伸至第2刚节末端/第3刚节中部；具约60~90个具鳃刚节（branchiate chaetiger）。本新种Marenzelleria bastropi sp. nov.与M. neglecta（Sikorski & Bick, 2004）及Marenzelleria viridis（Verrill, 1873）亲缘关系密切。本文首次记述了采自斯匹次卑尔根西部的Marenzelleria wireni Augener, 1913；对该种的成体标本进行了研究，并与其他分布区域的标本进行了比对。此外，本文还提供了所有马尔泽勒虫属（Marenzelleria）物种的亚成体及成体标本检索表。