Early Cretaceous bivalves of the Romualdo Formation, Araripe Basin, northeastern Brazil

IF 1.9 3区 地球科学 Q1 GEOLOGY
Vitor B. Guerrini , Suzana A. Matos , Franz T. Fürsich , Mariza G. Rodrigues , Filipe G. Varejão , Lucas V. Warren , Mario L. Assine , Marcello G. Simões
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引用次数: 0

Abstract

The fossil-rich Romualdo Formation (late Aptian/early Albian), Araripe Basin, northeastern Brazil, contains world-renowned Fossillagerstätten characterized by exceptionally preserved fossils. Macroinvertebrates in this formation are primarily represented by mollusks, echinoids, and decapod crustaceans. Mollusk shells are abundant in certain stratigraphic intervals, forming coquinas or shell pavements. Despite recent advances in our understanding of the taxonomy of certain groups, comprehensive taxonomic studies are lacking for almost the entire bivalve fauna. Therefore, a detailed taxonomic analysis is presented here. The described bivalves include four new genera (Araripenomia, Ciceromya, Inversatella, Australoeocallista), and six new species (Araripenomia infirma, Inversatella cearensis, Ciceromya edentulosa, Australoeocallista juazeiroi, Legumen kaririense, and Corbulomima delicata), in addition to Musculus maroimensis, Crassatella maroimensis, “Myrtea” sp. and “Tellina” sp. This bivalve fauna mainly consists of cosmopolitan and endemic brackish/marine genera, with Tethyan affinities. The fauna is not homogeneously distributed in the sedimentary succession of the Romualdo Formation, but is constrained to the third order highstand systems tract. Bivalves recorded from muddy facies are strongly dominated by infaunal and semi-infaunal suspension feeders. Assemblages of the sand-dominated facies, with dense shell accumulations of semi-infaunal to epifaunal byssate and infaunal suspension feeders, were formed under shallow, higher energy conditions. Despite the degree of generic endemicity, the mytilids, anomiids, crassateliids, astartids, tellinids, and corbulids are related to the bivalve fauna of the Early Cretaceous Riachuelo Formation of the Sergipe-Alagoas Basin, as previously demonstrated for the bakevelliids and echinoids. Indeed, the Romualdo bivalve fauna is, in part, a modified and impoverished brackish/marine fauna of the Riachuelo Formation.

巴西东北部 Araripe 盆地 Romualdo 地层的早白垩世双壳类动物
巴西东北部 Araripe 盆地化石丰富的 Romualdo Formation(晚始新世/早白垩世)拥有世界闻名的化石群,其特点是化石保存异常完好。该地层中的大型无脊椎动物主要是软体动物、回声类动物和十足目甲壳类动物。软体动物的贝壳在某些地层间隙中非常丰富,形成了贝壳层(coquinas)或贝壳铺层(shell pavements)。尽管最近我们对某些类群的分类有了进一步的了解,但几乎所有双壳类动物都缺乏全面的分类研究。因此,本文介绍了详细的分类分析。所描述的双壳类包括四个新属(Araripenomia属、Ciceromya属、Inversatella属、Australoeocallista属)和六个新种(Araripenomia infirma属、Inversatella cearensis属、Ciceromya edentulosa属、Australoeocallista juazeiroi属、Legumen kaririense属和Corbulomima delicata属),此外还有Musculus maroimensis属、Crassatella maroimensis属、"Myrtea "属和 "Tellina "属。该双壳类动物群主要由世界性和特有的咸水/海水属组成,与哲罗米群岛有亲缘关系。该动物群在罗穆阿尔多地层的沉积演替中分布不均,但仅限于三阶高台系统道。泥质地层中记录的双壳类动物主要以内栖和半内栖悬浮取食动物为主。以砂质为主的岩层中,半底栖至上层底栖副贝和底栖悬浮取食器的贝壳密集堆积,是在较浅、能量较高的条件下形成的。尽管具有一定程度的类属特有性,但贻贝纲、蚁贝纲、蝶贝纲、蛎壳纲和蚬贝纲与塞尔希培-阿拉戈斯盆地早白垩世里亚丘洛地层的双壳类群有亲缘关系,这一点已在之前的焙贝类和回声类群中得到证实。事实上,罗穆阿尔多双壳类动物群在一定程度上是里亚楚埃洛地层经过改造的贫瘠咸水/海水动物群。
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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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