Mccowin Marina F, Rouse Greg W
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0202, USA.
Zootaxa. 2018 Oct 23;4504(1):1-22. doi: 10.11646/zootaxa.4504.1.1.
Lamellibrachia Webb, 1969 has eight currently recognized species reported from chemosynthetic environments in the Pacific, Atlantic, and Mediterranean. Of these, Lamellibrachia barhami Webb, 1969 has been reported in the eastern Pacific from Canada to Costa Rica. In this study, phylogenetic analyses of Lamellibrachia tubeworms sampled from the Costa Rica margin confirm the large geographic range of L. barhami and reveal a new Lamellibrachia species from a single methane seep between 999 and 1,040 meters. Lamellibrachia donwalshi sp. nov. differs genetically and morphologically from all congeneric species. Despite its geographic proximity to the eastern Pacific L. barhami, L. donwalshi sp. nov. formed a clade with Atlantic and Mediterranean Lamellibrachia species. This suggests a vicariant event may have occurred after an Atlantic radiation of Lamellibrachia.
拉梅利腕海笋属（Lamellibrachia Webb，1969）目前已知有8个物种，分布于太平洋、大西洋和地中海的化能合成环境中。其中，巴氏拉梅利腕海笋（Lamellibrachia barhami Webb，1969）在东太平洋从加拿大到哥斯达黎加均有报道。在本研究中，对从哥斯达黎加边缘采集的拉梅利腕海笋管虫进行的系统发育分析证实了巴氏拉梅利腕海笋的广泛地理分布，并揭示了一种来自999至1040米之间单一甲烷冷泉的新拉梅利腕海笋物种。新物种唐瓦尔氏拉梅利腕海笋（Lamellibrachia donwalshi sp. nov.）在基因和形态上与所有同属物种不同。尽管它在地理上靠近东太平洋的巴氏拉梅利腕海笋，但唐瓦尔氏拉梅利腕海笋与大西洋和地中海的拉梅利腕海笋物种形成了一个分支。这表明在拉梅利腕海笋在大西洋扩散之后可能发生了替代事件。
