An amphisbaenian skull from the European miocene and the evolution of Mediterranean worm lizards.

An amphisbaenian skull from the European miocene and the evolution of Mediterranean worm lizards.
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DOI:
10.1371/journal.pone.0098082
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Alba DM
Alba DM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bolet A;Delfino M;Fortuny J;Almécija S;Robles JM;Alba DM

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两栖动物(地中海蠕虫蜥蜴)的进化主要是基于分子研究,尽管它们的化石在欧洲新生代地区很常见。这是因为化石记录只存在于分类学价值有限的孤立元素中。我们描述了欧洲唯一已知的两栖动物头骨化石--归因于Blanus mendezi sp.11月它代表了迄今所描述的最具信息量的白垩纪化石。该标本来自中新世中期(11.6 Ma,MN7+8),位于瓦莱-S-彭内S盆地(加泰罗尼亚,东北伊比利亚半岛),明确地断言欧洲中新世存在Blanus。这加强了来自欧洲新近纪其他地方的先前已知的、更不完整的和糟糕的诊断材料的这一属的转介。我们的分析--结合现有的分子、古生物学和生物地理数据--表明,新物种发生在现存的两个主要蓝带分支(地中海东部和西部)之间的分歧之后,可能早于伊比利亚和西北部非洲亚支之间的分裂。这支持了之前的白带演化的古生物地理假说,并为校准白带系统发育的分子分析提供了一个显着的最小分歧时间。
The evolution of blanid amphisbaenians (Mediterranean worm lizards) is mainly inferred based on molecular studies, despite their fossils are common in Cenozoic European localities. This is because the fossil record exclusively consists in isolated elements of limited taxonomic value. We describe the only known fossil amphisbaenian skull from Europe – attributed to Blanus mendezi sp. nov. (Amphisbaenia, Blanidae) – which represents the most informative fossil blanid material ever described. This specimen, from the Middle Miocene of Abocador de Can Mata (11.6 Ma, MN7+8) in the Vallès-Penedès Basin (Catalonia, NE Iberian Peninsula), unambiguously asserts the presence of Blanus in the Miocene of Europe. This reinforces the referral to this genus of the previously-known, much more incomplete and poorly-diagnostic material from other localities of the European Neogene. Our analysis – integrating the available molecular, paleontological and biogeographic data – suggests that the new species postdates the divergence between the two main (Eastern and Western Mediterranean) extant clades of blanids, and probably precedes the split between the Iberian and North-Western African subclades. This supports previous paleobiogeographic scenarios for blanid evolution and provides a significant minimum divergence time for calibrating molecular analyses of blanid phylogeny.
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影响因子: --
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