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1 January 2014 Life and Death: An Intriguing History of a Jurassic Crinoid
Rafał Lach, Dawid Trzęsiok, Patrycja Szopa
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Abstract

A stalk fragment of the millericrinid crinoid Pomatocrinus sp. from the lower Kimmeridgian of Małogoszcz Quarry (Central Poland) consists of a partly preserved holdfast and a distal stalk fragment, which yields numerous epibionts and echinoid grazing traces. Importantly, the described stalk shows evidence of narrowing of the proximal part. Such a pathological structure of the apical part of the column likely represents a nonregenerative overgrowth of the stalk following the loss of the proximal column and crown due to nektonic predation as inferred from associated bite marks. Analogous pathological structures in fossil crinoids, although rare, are known from as far back as the Ordovician.

© by the Palaeontological Society of Japan
Rafał Lach, Dawid Trzęsiok, and Patrycja Szopa "Life and Death: An Intriguing History of a Jurassic Crinoid," Paleontological Research 18(1), 40-44, (1 January 2014). https://doi.org/10.2517/2014PR004
Received: 6 June 2013; Accepted: 1 July 2013; Published: 1 January 2014
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