Molecular phylogeny, morphology, and distribution of Polygordius (Polychaeta: Polygordiidae) in the Atlantic and Mediterranean.

Molecular phylogeny, morphology, and distribution of Polygordius (Polychaeta: Polygordiidae) in the Atlantic and Mediterranean.
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大西洋和地中海蓼属(Polychaeta:Polygordiidae)的分子系统发育、形态和分布

DOI:
10.1016/j.ympev.2018.06.039
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发表时间:
2018
影响因子:
4.1
通讯作者:
Struck
Struck
中科院分区:
生物学1区
文献类型:
--
作者:
Ramey-Balci;Struck

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间质分类群的低形态多样性使得很难划分物种,仅基于形态和分子数据的地理边界往往揭示隐藏的物种。(环节动物,Polygordiidae)具有低形态多样性,但由于其细长的形式,高繁殖力,从西北大西洋、地中海和西南大西洋的14个地点收集的Polygordiusspecies,包括几个各自的典型地点进行了分析。这项研究提出了第一个的genusPolygordius和结合的分子数据,COI,16 S和ITS 1/2基因序列,和形态学数据的系统重新评估的重点是大西洋物种,重点是人口从欧洲沃茨。系统发育分析得到了6个有效种(P. apaperulatus、P. lacteus、P. neapolitanus、P. triestinus、P. jouinae和P. lacteus)。eschaturus),并且它们的独特性通过单倍型网络分析得到证实。因此,分子生物学数据支持了先前确认的形态种的有效性,并且没有新的种存在。villotiare invalid species与P. lacteus。头部和尾部形态和幼虫类型(内幼虫与外幼虫)的细微差异,是有用的特征进行区分。然而,在某些物种中,个体之间看似显著的性状变异并不是诊断性的(例如,尾须纤毛数)。高度相似的物种的基础上成年形态被证明是姐妹类群发生在异地。根据研究结果,总结了目前的物种分布格局。
Low morphological diversity among interstitial taxa makes it difficult to delimit species and their geographic boundaries based solely on morphology and molecular data often reveal cryptic species.Polygordius(Annelida, Polygordiidae) have low morphological diversity, but are unusual among interstitial species in their comparatively large size due to their elongated form, high fecundity, and potential for long-distance dispersal via a planktotrophic larval stage.Polygordiusspecies collected from 14 localities in the Northwest Atlantic, Mediterranean Sea, and Southwest Atlantic including several of the respective type localities were analysed. This study presents the first phylogeny of the genusPolygordiusand combines molecular data, sequences of COI, 16S and ITS1/2 genes, and morphological data for a systematic re-evaluation focusing on Atlantic species, with an emphasis on populations from European waters. Phylogenetic analyses recovered six valid species (P. appendiculatus, P. lacteus, P. neapolitanus, P. triestinus, P. jouinae, andP. eschaturus) and their distinctness is confirmed by haplotype network analyses. Thus, molecular data supported the validity of the previously recognized morpho-species and no new species were present.P. erythrophthalmusandP. villotiare invalid species being synonymous withP. lacteus. Subtle differences in head and pygidial morphology and larval type (endolarva vs. exolarva), were useful characters for discrimination. Yet seemingly significant variation in characters among individuals in some species was not diagnostic (e.g., number of pygidial cirri). Highly similar species based on adult morphology were shown to be sister taxa occurring in allopatry. Present day distribution patterns of species are summarized in light of this study.
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