Phylogenetic relationships of Malarossia Berezovsky (Eocene, Ukraine) and trends in the size evolution of the carditids (Bivalvia, Carditidae)

IF 2.3 2区地球科学 Q1 PALEONTOLOGY

Papers in Palaeontology Pub Date : 2024-06-21 DOI:10.1002/spp2.1578

Damián E. Pérez, Anatoly A. Berezovsky

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引用次数: 0

Abstract

Phylogenetic studies of fossil bivalves are crucial for understanding evolution in both extinct and extant species, and the family Carditidae has received limited research attention in this regard. The endemic genus Malarossia comes from the Eocene deposits of Ukraine and the diversity of carditids during this time have been broadly described from North America and Western Europe, although little is known beyond these regions. The aim of this study is to explore the phylogenetic position of the genus Malarossia and discuss trends in shell size among carditids. To accomplish this, a phylogenetic analysis was conducted using 51 species and 153 morphological characters. Our findings indicate that Malarossia represents an early diverging genus within the subfamily Scalaricarditinae, supported by morphological characters related to development and number of radial ribs, placement of pallial line, and umbones, among others. A wide range in shell size can be seen among carditids, with average values ranging from 3 to 100 mm. Notably, the larger sizes were predominantly observed during the Paleocene–Eocene, in the Venericorini. The Miodomeridinae and Scalaricarditinae had the smallest shell sizes, spanning from the Eocene to the present. Paedomorphic heterochronic processes are suggested for the origin of the small size observed in the Scalaricarditinae subfamily.

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Malarossia Berezovsky（始新世，乌克兰）的系统发育关系和贲门鱼类（双壳类，贲门鱼科）的体型演变趋势

双壳类化石的系统发育研究对于了解已灭绝物种和现存物种的进化至关重要，而红心贻贝科在这方面受到的研究关注却很有限。特有的 Malarossia 属来自乌克兰始新世的沉积物，北美和西欧对这一时期红心贻贝的多样性进行了广泛的描述，但对这些地区以外的红心贻贝却知之甚少。本研究的目的是探讨 Malarossia 属的系统发育位置，并讨论红心蝶类贝壳大小的变化趋势。为此，我们利用 51 个物种和 153 个形态特征进行了系统发育分析。我们的研究结果表明，Malarossia 是鳞栉水母亚科（Scalaricarditinae）中的一个早期分化属，其形态特征包括放射肋的发育和数量、掌线的位置以及脐等。红心蝶类的贝壳大小差异很大，平均值从 3 毫米到 100 毫米不等。值得注意的是，较大的贝壳主要出现在古新世-始新世的 Venericorini 类中。Miodomeridinae和Scalaricarditinae的贝壳尺寸最小，从始新世一直到现在。在杓鹬亚科中观察到的小尺寸贝壳的起源被认为是同形异时过程。

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来源期刊

Papers in Palaeontology PALEONTOLOGY-

CiteScore

4.50

自引率

4.30%

发文量

期刊介绍： Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.