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首页> 外文期刊>Marine biology >Molecular evidence for multiple lineages in the gorgonian family Plexauridae (Anthozoa : Octocorallia)
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Molecular evidence for multiple lineages in the gorgonian family Plexauridae (Anthozoa : Octocorallia)

机译：戈氏家族的丛属科（Anthozoa：Octocorallia）中多个谱系的分子证据

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摘要

Octocorals are diverse and abundant on many marine hard substrates, and, within this group, members of the family Plexauridae are an important component of tropical reef assemblages, especially in the Caribbean. To understand historical relationships within this large and diverse assemblage, and to test the monophyly of the family and some of its genera, DNA sequences of two mitochondrial loci (msh1 and ND2, similar to 1,185 bp) were analyzed from 46 species in 21 genera from deep and shallow waters in the tropical western Atlantic and in the tropical western and eastern Pacific (plus 9 taxa in the closely related Gorgoniidae and 1 species of the more distantly related Alcyoniidae). Five strongly supported clades were recovered. Three large clades correspond roughly to the Plexauridae, Paramuriceidae, and Gorgoniidae, and two smaller clades were comprised of taxa previously assigned to several families. Astrogorgia sp. did not group with any of the clades. The mutual relationships among the five clades remain unclear. Several genera previously regarded as unrelated appear to be grouped among the three "families"; e.g. Hypnogorgia sp. (Paramuriceidae) falls within a clade consisting of both Pacific and Atlantic Muricea spp. (Plexauridae), while Swiftia sp., Scleracis sp., and an Atlantic Thesea sp. (all Paramuriceidae) group with the gorgoniids. In several instances, genera containing Atlantic and Pacific species were recovered as monophyletic (Muricea spp., Bebryce spp.). However, in at least three cases (Echinomuricea spp., Thesea spp., Villogorgia spp.), placement of Atlantic and Pacific species in the same genus may reflect convergence of sclerite morphology. The results indicate a strong need for reexamination of octocoral taxonomy using a combination of molecular, morphological, and chemical evidence.
机译：在许多海洋硬质底物上八足动物种类繁多，种类丰富，在这一组中，丛生科的一员是热带礁组合的重要组成部分，尤其是在加勒比海地区。为了了解这个庞大而多样的组合中的历史关系，并测试该家族及其某些属的单亲性，对两个线粒体基因座（msh1和ND2，类似于1,185 bp）的DNA序列进行了分析，它们来自21个属的46个种。热带西大西洋和​​热带西太平洋和东太平洋的深水和浅水域（在密切相关的Gorgoniidae中有9个分类单元，在更远距离相关的Alcyoniidae中有1种）。恢复了五个有力支持的进化枝。三个大型进化枝大致与丛生科，副mur科和Gorgoniidae相对应，而两个较小的进化枝则由先前分配给多个科的类群组成。天文学没有与任何进化枝分组。五个分支之间的相互关系仍然不清楚。以前被认为无关的几个属似乎被归入三个“家庭”之中。例如催眠症（Paramuriceidae）属于由太平洋和大西洋Muricea spp组成的进化枝。 （Plexauridae），而Swiftia sp。，Scleracis sp。和Atlantic Thea sp.。 （所有Paramuriceidae）组与肉豆蔻。在一些情况下，包含大西洋和太平洋物种的属被回收为单系的（Muricea spp。，Bebryce spp。）。然而，在至少三种情况下（棘皮鱼属，a虫属，绒毛藻属），大西洋和太平洋物种在同一属中的放置可能反映出硬粒形态的趋同。结果表明，强烈需要结合分子，形态和化学证据对八级分类法进行重新检查。

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