Middle and Upper Ordovician linguliformean and craniiformean brachiopods from the Brabant Massif, Belgium: Infaunal giants, encrusting forms and durophagy

IF 1.6 4区地球科学 Q2 PALEONTOLOGY

Geobios Pub Date : 2023-12-01 DOI:10.1016/j.geobios.2023.04.002

Yves Candela , Bernard Mottequin

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Abstract

Linguliformean and craniiformean brachiopods from the Middle and Upper Ordovician of the Brabant Massif (Belgium) are described for the first time and their palaeoecological and palaeobiogeographical implications are discussed. The restricted and generally poorly preserved material was collected from the Abbaye de Villers (Dapingian–Darriwilian) Formation and from the Katian Huet and Fauquez formations. The dark graptolitic mudstones of the latter unit yielded the most diverse assemblage including seven pseudolingulid, obolid, discinid, and craniopsid species while the Abbaye de Villers and Huet formations only yielded one species each. Due to the scarcity of internal morphological details available, comparison of the pseudolingulid and obolid specimens under investigation here was undertaken by running a Principal Component Analysis using a Log-Shape Ratio transformation of linear measurements. The study of valve shape changes at various growth stages helped identify these Belgian specimens at the family and generic levels. Finally, two unusually long (up to 20 mm) shell repair scars are documented in Pseudolingula and reflect predatory attacks at the anterior margin during early growth stages.

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比利时布拉班特地区中、上奥陶统舌形和颅形腕足动物:巨型动物、壳壳形态和嗜硬食

首次描述了比利时布拉班特丘陵地带中上奥陶世的腕足类和颅足类，并讨论了它们对古生态学和古生物地理学的影响。从 Abbaye de Villers（Dapingian-Darriwilian）地层以及 Katian Huet 和 Fauquez 地层中采集到的材料数量有限，且保存状况普遍较差。后一单元的深色粒状泥岩出土的标本种类最多，包括 7 种假灵长类、斜长类、盘状类和颅足类标本，而 Abbaye de Villers 地层和 Huet 地层仅各出土 1 种标本。由于可获得的内部形态细节较少，因此通过对线性测量值进行对数形状比变换，运行主成分分析，对这里研究的假鳞蜥类和斜齿蜥类标本进行了比较。对不同生长阶段气门形状变化的研究有助于将这些比利时标本确定为科属级别。最后，在假鳞栉水母中发现了两处异常长（长达 20 毫米）的贝壳修复疤痕，这反映了生长初期前缘受到的掠夺性攻击。

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来源期刊

Geobios 地学-古生物学

CiteScore

3.30

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.