Temat: Eifelian - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A new pleurocystitid blastozoan from the Middle Devonian of the Eifel (Germany) and its phylogenetic importance
Autorzy:: Nardin, E.
Bohaty, J.
Powiązania:: https://bibliotekanauki.pl/articles/20422.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: new pleurocystitid blastozoan
blastozoan
Middle Devonian
Germany
phylogenetic importance
Echinodermata
Blastozoa
Pleurocystitidae
Regulaecystis
evolution
paleoecology
Eifelian
Devonian
Rhenish Massif
Opis:: 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.
Źródło:: Acta Palaeontologica Polonica; 2013, 58, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Revision of the flexible crinoid genus Ammonicrinus and a new hypothesis on its life mode
Autorzy:: Bohaty, J.
Powiązania:: https://bibliotekanauki.pl/articles/20333.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: flexible crinoid
crinoid
Ammonicrinus
new hypothesis
life mode
Crinoidea
Flexibilia
Devonian
Eifelian
Rhenish Massif
Germany
paleontology
Middle Devonian
Opis:: The lecanocrinid Ammonicrinus(Flexibilia) is newly interpreted based on new material from the Middle Devonian of the Rhenish Massif (Eifel and Bergisches Land, Germany). The species have echinoid−like tubercles on the attachment and on the column, which bear articulated spines. The intraspecific variability of the column is discussed for three facies−controlled morphotypes, herein classified as standard “exposed−” or “encased roller−type” and the rare “settler−type”. New specimens have floating transitions between different plate sculpturing and between those individuals with none or one to several columnals with herein termed “lateral columnal enclosure extensions” on the proximal−most, barrel−like dististele and the following mesistele, which is solely distinguished by these extensions. Based on this interpretation, Ammonicrinus kongieli is evaluated as a subjective junior synonym of Ammonicrinus sulcatus. The latter species was first recognised from the Eifel (Germany). “Ammonicrinus wachtbergensis”, from the upper Eifelian of the Eifel, is declared a subjective junior synonym of Ammonicrinus doliiformis. The first nearly complete specimen of Ammonicrinus kerdreoletensis is described from the lower Eifelian of Vireux−Molhain (southern Ardennes, France). Two new species are described: Ammonicrinus jankei sp. nov. and Ammonicrinus leunisseni sp. nov. A functional morphologic trend in perfecting the crown encasement by continuous modification of the lateral columnal enclosure extensions of the mesistele from the Eifelian to the Givetian, indicates a vagile benthic “predator”−driven evolution of ammonicrinids in the Eifel area. Several ammonicrinid species are herein defined as spined soft−bottom dwellers, feeding in low−intensity current water, possibly through a self−produced water flow. The first known postmortem encrusting epizoans on ammonicrinid endoskeletons are reported.
Źródło:: Acta Palaeontologica Polonica; 2011, 56, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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