上白垩世艾伦地层(阿根廷巴塔哥尼亚)出土的新哺乳动物以及美利达动物多样性的重新评估

IF 1.9 3区 地球科学 Q1 GEOLOGY
Brigid E. Connelly , Mauricio S. Cardozo , Joshua D. Montgomery , Guillermo W. Rougier
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引用次数: 0

摘要

干腹目哺乳动物是劳拉西亚侏罗纪动物群的经典成员,但在白垩纪大多不存在。而在冈瓦纳,尤其是南美洲,情况则恰恰相反,在晚白垩世,美利多龙类(meridiolestid dryolestoids)占主导地位。我们在此描述了从上白垩世的 Cerro Tortuga(艾伦地层,阿根廷巴塔哥尼亚)通过筛洗采集到的 21 个新的哺乳动物标本,并将其鉴定为meridiolestid dryolestoids。我们确认了一个新的梅里迪奥斯特类物种,并将以前描述过的一个标本重新归入新的类群。这些新遗骸的形态代表了梅里亚龙类多样性谱系中的一个新的形态类型,记录了从祖先的昆虫食性到该类群后期和更多衍生成员中观察到的更多衍生草食性营养适应性的扩大。新的牙齿形态有助于将多齿尖齿美利多虫的解剖学与更衍生的馒头齿介壳虫的解剖学联系起来。这一新类群表明,宽大的齿槽和复杂的牙冠形态的发展要早于宽大的压缩齿根、包齿和增厚的珐琅质的发展,这些都是派生介壳虫类的特征。采集的其他标本可与同一地点以前已知的类群相参照。这些标本提供了有关牙齿定位、牙式和整体牙齿形态的新信息。新材料表明,Groebertherium(以前被认为是旱龙类的一个类群)实际上很可能是子午龙类的一个成员。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New mammals from the Upper Cretaceous Allen Formation (Patagonia, Argentina) and reassessment of meridiolestidan diversity

Dryolestoid mammals are classical members of the Jurassic faunas of Laurasia but mostly absent during the Cretaceous. The reverse is true in Gondwana in general and South America in particular, where meridiolestid dryolestoids are dominant in the Late Cretaceous. We describe here 21 new mammalian specimens from the Upper Cretaceous locality Cerro Tortuga (Allen Formation, Patagonia, Argentina) collected via screenwashing, which we identify as meridiolestid dryolestoids. We recognize a new species of meridiolestid and reassign a previously described specimen to the new taxon. The morphology of these new remains represents a new morphotype in the spectrum of meridiolestid diversity, recording a broadening of trophic adaptations from the ancestral insectivory to the more derived herbivory observed among the later and more derived members of the group. The novel dental morphology helps bridge the anatomy of the plesiomorphic sharp-toothed meridiolestidans with that of the more derived and bunodont mesungulatoids. The new taxon suggests that development of both broad cingulids and complex crown morphology precede the development of the wide compressed roots, bunodonty, and thickened enamel characteristic of derived mesungulatids. Other specimens from the collection are referable to taxa previously known from the same locality. These provide new information about tooth positioning, dental formula, and overall dental morphology. The new material suggests that Groebertherium, previously regarded as a dryolestid taxon, is in fact a likely member of Meridiolestida.

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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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