A new pleurocystitid blastozoan from the Middle Devonian of the Eifel (Germany) and its phylogenetic importance

• Autorzy: Nardin E. , Bohaty J.
• Języki publikacji: EN

Abstrakty

EN

Rich echinoderm fauna from the Middle Devonian of the Eifel (Rhenish Massif, Germany) has yielded specimens of the rare recumbent pleurocystitid rhombiferans. Regulaecystis testudineus sp. nov. extends the stratigraphic range of the pleurocystitids to the Eifelian (Middle Devonian). Specimens show a strongly inflated and ornamented theca, which is unusual for the European pleurocystitids. Phylogenetic analysis of all described pleurocystitid genera suggests a close relationship of Regulaecystis with the other Devonian genera. Results indicate that the degree of inflation and of ornamentation of the theca can be interpreted as convergences within the pleurocystitids due to environmental conditions (such as surface consistency, hydrodynamism). R. testudineus sp. nov. was living as a strict epibenthic vagile organism; lying on muddy soft to firm substrates in quiet to agitated shallow warm water environments.

Słowa kluczowe

EN

new pleurocystitid blastozoan; blastozoan; Middle Devonian; Germany; phylogenetic importance; Echinodermata; Blastozoa; Pleurocystitidae; Regulaecystis; evolution; paleoecology; Eifelian; Devonian; Rhenish Massif

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2013
• Tom: 58
• Numer: 3
• Opis fizyczny: p.533-544,fig.,ref.

Twórcy

autor

Nardin E.

• CNRS, UMR 5563 GET, OMP, 14 avenue Edouard Belin, F-31400 Toulouse, France

autor

Bohaty J.

• Rennebergstrasse 10, D-50939 Köln, Germany

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