Early Cretaceous freshwater bivalves from northeastern Brazil: Insights into the evolutionary history of South American freshwater mussels

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research Pub Date : 2025-08-28 DOI:10.1016/j.cretres.2025.106212

Victor R. Silva , Vitor B. Guerrini , Filipe G. Varejão , Rafael C. Silva , Katie Collins , Ismar S. Carvalho , Simon Schneider , Marcello G. Simões

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引用次数: 0

Abstract

We revise and describe the Early Cretaceous (Berriasian to Albian) freshwater bivalves from northeastern Brazil, including representatives of Unionida, Trigoniida, and potentially Sphaeriida. Three genera previously thought to be endemic to the Aptian to Albian Crato and Romualdo formations, Araripe Basin, Ceará State, i.e. Cratonaia, Araripenaia, and Monginellopsis, are now recorded from other interior basins. The Berriasian to Barremian Mont Serrat Conglomerate (Salvador Formation) of the Recôncavo Basin, Bahia State, hosts a diverse Unionida-dominated fauna, including Mycetopoda, Anodontites?, Cratonaia, and potentially also hyriids. Specimens tentatively assigned to the neomiodontid Musculiopsis also occur. This fauna has mixed Gondwanan and Laurasian affinities and likely thrived in ephemeral streams and/or floodplain lakes. Araripenaia is recorded from the Aptian Marizal Formation of the Tucano Basin. Supposed representatives of Sphaerium from the same strata are clam shrimps (Diplostraca). Cratonaia and Monginellopsis occur in the Aptian-Albian Itapecuru Formation of the Parnaíba Basin, Maranhão State. Articulated shells of Cratonaia, Araripenaia, and Monginellopsis are typically associated with fluvial-lacustrine deposits. Their common occurrence in Aptian-Albian strata of northeastern Brazil suggests dispersal via fluvial systems connecting the different sedimentary basins. These northeastern Brazilian assemblages are distinct from those of the Upper Cretaceous Bauru Basin in southeastern Brazil. Despite South America and North Africa being connected for most of the Early Cretaceous, no shared freshwater bivalves are known. The newly described faunas provide insight into South American Early Cretaceous freshwater mussel diversity when the proto-South Atlantic was dominated by alluvial and lacustrine settings hosting abundant but poorly known freshwater bivalves.

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巴西东北部早白垩世淡水双壳类：对南美淡水贻贝进化史的洞察

我们对巴西东北部早白垩世（Berriasian - Albian）淡水双壳类进行了修正和描述，包括Unionida、Trigoniida和Sphaeriida的代表。以前被认为是阿普tian到Albian克拉托和Romualdo组，Araripe盆地，cerar State特有的三个属，即Cratonaia， Araripenaia和Monginellopsis，现在从其他内陆盆地记录下来。巴伊亚州Recôncavo盆地的Berriasian - Barremian Mont Serrat砾岩（Salvador组）拥有多种以unionida为主的动物群，包括足类动物、Anodontites？克拉通那亚，也可能是混血儿。也出现了暂定为新齿纲肌肉纲的标本。这种动物混合了冈瓦纳和劳拉的亲缘关系，可能在短暂的溪流和/或洪泛区湖泊中繁衍生息。Araripenaia记录于Tucano盆地Aptian Marizal组。假定来自同一地层的球形目的代表是蛤虾（蛤虾属）。Cratonaia和Monginellopsis发生在马拉州Parnaíba盆地的Aptian-Albian Itapecuru组。克拉通、Araripenaia和Monginellopsis的铰接壳通常与河流-湖泊沉积有关。它们在巴西东北部Aptian-Albian地层中普遍存在，表明它们是通过连接不同沉积盆地的河流系统传播的。这些巴西东北部的组合与巴西东南部的上白垩纪Bauru盆地的组合不同。尽管在早白垩纪的大部分时间里，南美洲和北非是相连的，但没有已知的淡水双壳类动物。新描述的动物群提供了对南美早白垩世淡水贻贝多样性的深入了解，当时原南大西洋由冲积和湖泊环境主导，拥有丰富但鲜为人知的淡水双壳类。

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来源期刊

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.