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标题：Centrichnus eccentricus revisited: A new view on anomiid bivalve bioerosion
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作者：CHRISTIAN NEUMANN ; MAX WISSHAK ; MARTIN ABERHAN 等
期刊名称：Acta Palaeontologica Polonica
印刷版ISSN：0567-7920
电子版ISSN：1732-2421
出版年度：2015
卷号：60
期号：3
页码：539-549
DOI：10.4202/app.00079.2014
语种：English
出版社：Institute of Paleobiology PAS
摘要：Saddle oysters (Anomiidae) attach themselves to calcareous hard substrates by means of a calcified byssus that etches an attachment structure, referred to as ichnospecies Centrichnus eccentricus. Examination of rich material from the Late Cretaceous of central Europe extends the fossil record of this ichnotaxon and revealed a set of previously unrecognised morphological features which appear to be typical for this time period and the respective anomiid trace maker. Excellent preservation of a large number of trace fossil specimens with a complete set of morphological characters allowed a biometrical analysis and additional observations indicating a distinct substrate preference for belemnite rostra, a strong intra- and interspecific competition for settlement space, as well as interactions with durophaguous predators. Further implications for anomiid palaeobiology and palaeoecology arise from allometric shell growth and an etched outline suture in the substrate along the dorsal, lateral and ventral shell margins. These features enhanced a firm attachment and increased shear resistance, and thus are interpreted as an effective defence mechanism against shell-crushing enemies under the intensified predation pressure in marine environments in the Late Cretaceous.
关键词：Mollusca;Anomiidae;Centrichnus eccentricus;belemnite;trace fossil;attachment bioerosion;Cretaceous;Europe