Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla CA, 92093-0202, USA.
Zootaxa. 2021 Jan 20;4915(1):zootaxa.4915.1.1. doi: 10.11646/zootaxa.4915.1.1.
The bathyal serpulid Laminatubus alvini ten Hove Zibrowius, 1986 was described from the periphery of hydrothermal vents of the Galapagos Rift and has been recorded from other vent communities of the East Pacific Rise (EPR). Here we assessed the biodiversity of serpulids collected from eastern Pacific hydrothermal vents and methane seeps using DNA sequences and morphology. Laminatubus alvini showed little genetic variation over a wide geographic range from the Alarcon Rise vents in southern Gulf of California (~23°N), to at least a point at 38°S on the EPR. Specimens from several methane seeps off Costa Rica and the Gulf of California (Mexico) differed markedly from those of Laminatubus alvini on DNA sequence data and in having seven thoracic chaetigers and lacking Spirobranchus-type special collar chaetae, thus fitting the diagnosis of Neovermilia. However, phylogenetic analysis of molecular data showed that L. alvini and the seep specimens form a well-supported clade. Moreover, among the seep specimens there was minimally a ~7% distance in mitochondrial cytochrome b sequences between a shallow-water (1000 m) seep clade restricted to Costa Rica and a deep-water clade (1800 m) from Costa Rica to Gulf of California. We describe the seep taxa here as morphologically indistinguishable L. paulbrooksi n. sp. and L. joycebrooksae n. sp.
深海盘管虫属的拉明塔布氏盘管虫（Laminatubus alvini ten Hove Zibrowius, 1986）最初是在加拉帕戈斯裂谷热液喷口的外围描述的，并且已经在东太平洋海隆（EPR）的其他喷口群落中被记录到。在这里，我们使用 DNA 序列和形态学评估了来自东太平洋热液喷口和甲烷渗漏区采集的盘管虫的生物多样性。拉明塔布氏盘管虫在从加利福尼亚湾南部的阿拉尔孔隆起喷口（23°N）到东太平洋海隆至少 38°S 的广泛地理范围内表现出很少的遗传变异。来自哥斯达黎加和加利福尼亚湾（墨西哥）的几个甲烷渗漏区的标本在 DNA 序列数据上与拉明塔布氏盘管虫明显不同，它们具有七个胸环节，并且缺乏 Spirobranchus 型特殊领毛，因此符合 Neovermilia 的诊断。然而，分子数据的系统发育分析表明，L. alvini 和渗漏标本形成了一个支持良好的分支。此外，在渗漏标本中，线粒体细胞色素 b 序列之间的距离最小为7%，一个浅水区（1000 米）的渗漏分支仅限于哥斯达黎加，而一个深水区分支（1800 米）从哥斯达黎加到加利福尼亚湾。我们将这些渗漏分类群描述为形态上无法区分的 L. paulbrooksi n. sp. 和 L. joycebrooksae n. sp.
