The Earliest Record of Pylochelid Hermit Crabs from the Late Jurassic of Southern Poland, with Notes on Paguroid Carapace Terminology

René H.B. fraaije; Wiesław krzemiński; Barry W.M. Van Bakel; Ewa Krzemińska; John W.M. Jagt

doi:10.4202/app.2011.0002

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1 September 2012 The Earliest Record of Pylochelid Hermit Crabs from the Late Jurassic of Southern Poland, with Notes on Paguroid Carapace Terminology

René H.B. fraaije, Wiesław krzemiński, Barry W.M. Van Bakel, Ewa Krzemińska, John W.M. Jagt

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Acta Palaeontologica Polonica, 57(3):647-654 (2012). https://doi.org/10.4202/app.2011.0002

Abstract

Strata with cyanobacterial-sponge buildups of Middle to Late Oxfordian (Late Jurassic) age in the southern Polish Uplands document the earliest known members of the Pylochelidae. Two new Late Jurassic species of “symmetrical” hermit crabs, Ammopylocheles robertboreki and Jurapylocheles iwonae, are described. A new term, the massetic region, is introduced to describe the equivalent in paguroids of the hepatic region in brachyuran carapaces, because in the former, this region does not reflect the position of the liver but rather an attachment zone of the mandibular muscles.

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René H.B. fraaije, Wiesław krzemiński, Barry W.M. Van Bakel, Ewa Krzemińska, and John W.M. Jagt "The Earliest Record of Pylochelid Hermit Crabs from the Late Jurassic of Southern Poland, with Notes on Paguroid Carapace Terminology," Acta Palaeontologica Polonica 57(3), 647-654, (1 September 2012). https://doi.org/10.4202/app.2011.0002

Received: 11 January 2011; Accepted: 12 July 2011; Published: 1 September 2012

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