A New Pleurocystitid Blastozoan from the Middle Devonian of the Eifel (Germany) and Its Phylogenetic Importance

@inproceedings{Nardin2012ANP,
  title={A New Pleurocystitid Blastozoan from the Middle Devonian of the Eifel (Germany) and Its Phylogenetic Importance},
  author={Elise Nardin and Jan Bohat{\'y}},
  year={2012}
}
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… 
Understanding form and function of the stem in early flattened echinoderms (pleurocystitids) using a microstructural approach
TLDR
It is shown that the articular facets of columnals in pleurocystitid rhombiferans are composed of fine labyrinthic stereom, implying that their stem was a muscular locomotory organ supporting an active mode of life.

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