Author:
Fatka Oldřich,Budil Petr,Kraft Petr
Abstract
Abstract. Articulated holaspid specimens of Placoparia Hawle and Corda, 1847
and Eoharpes Raymond, 1905 entombed inside cephalopod conchs and under the remains
of large illaenid, asaphid, cyclopygid and dalmanitid trilobites from the
Middle Ordovician Šárka Formation of the Prague Basin (Czech
Republic) are described and discussed. Two such samples were also found in
the overlying Dobrotivá Formation of Middle/Late Ordovician age. Four
articulated juvenile exoskeletons of Placoparia preserved under a cephalon of the
cyclopygid trilobite Degamella Marek, 1961 represent the first record of shelter
strategy of non-holaspid trilobites. The sheltered preservation of
trilobites could be explained by a hiding behaviour associated with the
danger of predation, storm disturbances, seeking for food or high
vulnerability after moulting. It is obvious that Placoparia and Eoharpes deliberately entered
the restricted space under skeletal parts of large trilobites or inside
cephalopod conchs. These exceptional finds provide a new insight in the life
strategy of some Ordovician benthic trilobites and are classified as cases
of “frozen” behaviour.
Funder
Grantová Agentura České Republiky
Ministerstvo Školství, Mládeže a Tělovýchovy
Reference88 articles.
1. Aubrechtová, M.: A revision of the Ordovician cephalopod Bactrites sandbergeri Barrande:
Systematic position and palaeobiogeography of Bactroceras, Geobios, 48, 193–211,
https://doi.org/10.1016/j.geobios.2015.03.002, 2015.
2. Aubrechtová, M. and Turek V.: Lituitid cephalopods from the Middle
Ordovician of Bohemia and their paleobiogeographic affinities, Bull.
Geosci., 93, 401–417, https://doi.org/10.3140/bull.geosci.1707, 2018.
3. Babcock, L. E.: Trilobites in Paleozoic predator-prey systems, and their
role in reorganization of Early Paleozoic ecosystems, in: Predator-prey
interactions in the fossil record, edited by: Kelley, P. H., Kowalewski, M.,
and Hansen, T. A., Kluwer Academic Publisher, New York, 55–92, 2003.
4. Bambach, R. K.: Energetics in the global marine fauna: A connection between
terrestrial diversification and change in the marine biosphere, Geobios-Lyon, 32,
131–144, https://doi.org/10.1016/S0016-6995(99)80025-4, 1999.
5. Barrande, J.: Note sur quelques nouveaux fossils de'couverts aux environs de la ville de Rokitzan dans le bassin silurien du
centre de la Bohême, Bull. Soc. Géol. Fr. Ser. 2, 13, 32–538,
1856.
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