Digestive structures in Middle Ordovician trilobite Prionocheilus Rouault, 1847 from the Barrandian area of Czech Republic

O. Fatka, P. Budil

Abstract


Remains of digestive system preserved in a slightly damaged articulated specimen of comparatively rare bathycheilid trilobite Prionocheilus vokovicensis (ŠNAJDR, 1956) are described for the first time. The specimen comes from the Middle Ordovician Šárka Formation of the Prague Basin and contains a post-stomach part of alimentary canal preserved through the axial region of glabella and six anterior thoracic segments. The anterior-most part of digestive system is unknown as the anterior glabellar lobes are not preserved in the studied specimen. In the cephalic shield, remains of two pairs of posterior glabellar gut diverticulae are seen in the glabella. Remains of five pairs of small cavities developed in axis of the first six thoracic segments represent remains of thoracic gut diverticulae. The discussed specimen possess the first undoubted remain of digestive structures established within the family Bathycheilidae PŘIBYL, 1953.


Keywords


Prionocheilus; Digestive tract; Ordovician; Barrandian area; Czech; Republic.

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DOI: http://dx.doi.org/10.1344/%25x

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Geologica Acta (ISSN-1695-6133)
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