An explanation for low endemism of Triassic crinoids fromthe epicontinental Germanic Basin, Poland

• Autorzy: Salamon M. A. , Niedźwiedzki R.
• Języki publikacji: EN

Abstrakty

EN

A summary of known crinoid taxa in the Polish part of the Triassic Germanic Basin, including their presence elsewhere, is documented. At present, 13 taxa and 3 ecophenotypes of crinoids have been recorded from that area, only one of them being endemic. In the Lower Muschelkalk and lower part of theMiddleMuschelkalk, taxa widespread both in the Tethys and Germanic Basin, or Tethyan taxa, dominate. In the Upper Muschelkalk crinoids are very rare in Poland, being represented by Encrinus liliiformis and Holocrinus sp. Many of the species occurring in the central part of the Germanic Basin in the Upper Muschelkalk have not been recorded in the eastern part of the basin. The degree of endemism of the crinoid fauna in theMuschelkalk is markedly lower than the degree of endemism of the rest of the benthonic macrofauna. This probably resulted from huge number of crinoids forming "crinoid gardens" that produced large number of larvae, increasing the chances of successful geographical expansion of crinoids.

Słowa kluczowe

EN

Germanic Basin; Poland; Triassic; muschelkalk; crinoids; biogeography

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2005
• Tom: Vol. 49, No. 3
• Strony: 331--338
• Opis fizyczny: Bibliogr. 43 poz., rys., tab.

Twórcy

autor

Salamon M. A.

• University of Silesia, Department of Palaeontology and Biostratigraphy, Będzińska 60, PL-41-200 Sosnowiec, Poland

autor

Niedźwiedzki R.

• Wrocław University, Institute of Geological Sciences, Cybulskiego 30, PL-50-204 Wroc³łw, Poland

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