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首页> 外文期刊>Journal of Systematic Palaeontology >A new palaeobatrachid frog from the early Oligocene of Suceag, Romania
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A new palaeobatrachid frog from the early Oligocene of Suceag, Romania

机译：罗马尼亚苏恰格早期渐新世的新古蛙

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摘要

The Eocene-Oligocene transition (Mammal Palaeogene zones, MP 20-21) corresponds in Europe to a major faunal turnover, called the 'Grande Coupure' (= Great Break). This event, produced by worldwide cooling and regression of seas, reshaped the faunal composition of Europe and resulted in the extinction of numerous ectothermic taxa. We describe a new palaeobatrachid frog from the early Oligocene of Suceag 1 (Rupelian: MP 23-24), Romania, and assign it to Albionbatrachus, a genus previously known only from the British Isles and thought to have gone extinct during the late Eocene (MP 20). Albionbatrachus oligocenicus sp. nov. is established on a distinctive frontoparietal bone, which differs from A. wightensis in a few details, including the morphology of the frontoparietal table and paraoccipital processes. The peculiar sculpture on the frontoparietal bears dense dermal vascularization, which might reflect adaptation to oxygen depleted environments. Two autapomorphic characters of the angulosplenial and ilium in A. oligocenicus sp. nov. likely reflect a shift in, respectively, feeding and locomotory behaviours. A phylogenetic analysis of the primarily Gondwanan group Xenoanura identifies Albionbatrachus as the sister taxon of Palaeobatrachus, and places these two genera as the sister group of a separate Pipidae + Avitabatrachus clade. The presence of A. oligocenicus sp. nov. in the Oligocene of Central Europe indicates that Albionbatrachus survived the 'Grande Coupure' and necessitates a revised palaeobiogeographical scenario for the genus. We propose that the geographical distribution of Albionbatrachus before the 'Grande Coupure' was wider, extending eastwards into Central Europe, and that the 'Grande Coupure' resulted in the extinction of Albionbatrachus only in the western part of its range. The final extinction of Albionbatrachus might have been associated with Oligocene climatic deterioration and with shrinking of specific aquatic habitats.
机译：在欧洲，始新世-渐新世过渡（哺乳动物古近纪带，MP 20-21）对应于一种重要的动物群落更新，称为“大过渡”（Great Break）。这次事件是由全球范围的海洋变冷和海退所引起的，重塑了欧洲的动物区系，并导致大量的放热类群灭绝。我们描述了罗马尼亚Suceag 1早渐新世（Rupelian：MP 23-24）的新古新青蛙，并将其分配给Albionbatrachus，这是以前仅从不列颠群岛知道的一种，被认为在始新世晚期已灭绝（ MP 20）。 Albionbatrachus oligocenicus sp。十一月建立在独特的额顶骨上，该骨在某些细节上不同于A. Wightensis，包括额顶表的形态和枕旁突。额顶上的特殊雕塑具有致密的真皮血管化作用，这可能反映了对缺氧环境的适应性。 A. oligocenicus sp。的软骨ple和lium的两个自交形特征。十一月可能分别反映了进食和运动行为的变化。对最初的冈瓦纳人群Xenoanura进行的系统发育分析表明，Albionbatrachus是Palaeobatrachus的姐妹分类群，并将这两个属作为单独的Pipidae + Avitabatrachus进化枝的姐妹组。 A. oligocenicus sp。的存在。十一月中欧渐新世的“白化”表明Albionbatrachus在“大革命”中幸存下来，因此有必要对该属进行古生物地理学的修订。我们认为，“大政变”之前的阿尔比昂巴特拉丘斯的地理分布范围更广，向东延伸到中欧，而“大政变”仅导致阿尔比昂巴特拉丘斯的灭绝仅在其范围的西部。 Albionbatrachus的最终灭绝可能与渐新世气候恶化以及特定水生生境的萎缩有关。

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