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New reticulated and annulated cephalopods from the Ordovician of the Prague Basin (Central Bohemia)

Published online by Cambridge University Press:  16 September 2025

Martina Aubrechtová Open the ORCID record for Martina Aubrechtová [Opens in a new window] ,
Vojtěch Turek Open the ORCID record for Vojtěch Turek [Opens in a new window]  and
David Evans Open the ORCID record for David Evans [Opens in a new window]
Martina Aubrechtová*
Affiliation:
Institute of Geology of the Czech Academy of Sciences , Rozvojová 269, CZ-16500 Prague 6, Czech Republic Department of Geology, Faculty of Science and Technology, Institute of Ecology and Earth Sciences, University of Tartu, Ravila 14a, 50411 Tartu, Estonia
Vojtěch Turek
Affiliation:
National Museum Prague, Václavské náměstí 68, CZ-11579 Prague 1, Czech Republic
David Evans
Affiliation:
10 Liddymore Road, Watchet, Somerset, TA23 0DQ UK
*
Corresponding author: Martina Aubrechtová; Email: aubrechm@gmail.com
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Abstract

This work expands the knowledge on the diversity of Ordovician cephalopod assemblages of peri-Gondwana by describing 16 straight-shelled, annulated and/or reticulately ornamented specimens from the late Darriwilian and late Katian strata of the Prague Basin (Central Bohemia). Preservation facilitated the micro-CT investigation of internal shell structures in one of the specimens; in other specimens, the siphuncle and septa are not preserved, and these specimens are thus left in open nomenclature. In total, six species are recognized with one new species established: Anthoceras? sp. A, Anthoceras? sp. B, Sactorthoceras pustulatum new species, Dawsonoceras? sp. indet., Kionoceras? sp. indet., and Palaeodawsonocerina obscurum new combination. In addition, the holotype of Orthoceras evictum was examined and re-interpreted as a conulariid rather than a cephalopod. Paleogeographically, these taxa indicate mixed Baltican, Avalonian and peri-Gondwanan affinities for the late Darriwilian and late Katian cephalopod assemblages.

UUID: http://zoobank.org/fcf79203-e864-47ed-bf71-12f475fa55a9

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Journal of Paleontology , Volume 99 , Issue 4 , July 2025 , pp. 890 - 904
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© The Author(s), 2025. Published by Cambridge University Press on behalf of Paleontological Society

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Footnotes

Handling Editor: Margaret Yacobucci

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