Terrestrial Isopods from Spanish Amber (Crustacea: Oniscidea): Insights into the Cretaceous Soil Biota

IF 1.1 3区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
Alba Sánchez-García, E. Peñalver, X. Delclòs, M. Engel
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引用次数: 2

Abstract

ABSTRACT Terrestrial isopods (Crustacea: Oniscidea) are a model group for studying the colonization of land. However, their fossil record is remarkably scarce and restricted to amber inclusions, and therefore amber deposits represent valuable windows to their past diversity and morphology. Here we present a new collection of 11 terrestrial isopod specimens preserved in Albian-aged amber from the Peñacerrada I outcrop, northern Spain, which collectively represent the most thoroughly documented fauna of Mesozoic Oniscidea. The three new genera and species identified belong to three of five major groups of the Oniscidea: Eoligiiscus tarraconensis, new genus and species (Ligiidae), Autrigoniscus resinicola, new genus and species (Synocheta: Trichoniscidae), and Heraclitus helenae, new genus and species (Crinocheta: Detonidae?). These taxa significantly expand the known fossil record of Oniscidea and demonstrate that considerable cladogenesis had already transpired by the Albian. The assemblage represents the earliest-known diversification of Oniscidea, extending direct evidence of terrestrialization in the group back to the late Early Cretaceous. These new taxa exhibit some characteristics that may inform hypotheses relating to general patterns of terrestrial isopod evolution. A discussion is provided about different aspects of the paleoecology and biology of the fossils compared to the Recent fauna. The new species indicate that Cretaceous isopods were a group of considerable adaptive diversity, exhibiting innovations analogous to what Recent isopods would exhibit 105 million years later.
来自西班牙琥珀的陆生等足类动物(甲壳纲:洋葱总科):白垩纪土壤生物群的见解
陆生等足类(甲壳纲:尾足纲)是研究陆地定殖的典型类群。然而,它们的化石记录非常稀少,而且仅限于琥珀包裹体,因此琥珀矿床是了解它们过去多样性和形态的宝贵窗口。在这里,我们展示了西班牙北部Peñacerrada I露头中保存在阿尔及利亚时代琥珀中的11个陆生等足类标本,这些标本共同代表了中生代蛇足类动物群的最完整记录。经鉴定的3个新属、新种隶属于蠓亚5个主要类群中的3个,分别是:蠓亚科新属、新种、新属、新种、新属、新种、新属、新种。这些分类群大大扩展了已知的蛇尾亚纲化石记录,并证明了相当大的枝进化已经在阿尔比亚发生。该组合代表了已知最早的蛇尾纲多样化,将该群体陆地化的直接证据追溯到早白垩纪晚期。这些新的分类群表现出一些特征,可以为有关陆地等足类动物进化的一般模式的假设提供信息。讨论了这些化石与近代动物群的古生态学和生物学的不同方面。这些新物种表明,白垩纪等足类动物是一个具有相当适应性多样性的群体,它们所表现出的创新类似于1.05亿年后的现代等足类动物所表现出的创新。
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来源期刊
American Museum Novitates
American Museum Novitates 环境科学-动物学
CiteScore
3.00
自引率
6.70%
发文量
8
审稿时长
>36 weeks
期刊介绍: The Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology.
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