A rare comatulid crinoid, Semiometra petitclerci (CAILLET, 1923), from the Upper Oxfordian of Poland

• Autorzy: Radwańska U.
• Języki publikacji: EN

Abstrakty

EN

A small faunule of feather stars or comatulids (free-living crinoids of the order Comatulida A.H. CLARK, 1908) is recorded from Upper Oxfordian strata (Bielawy/Wapienno sequence) in the Couiavia region, north-western Central Poland. It represents a single, very small-sized species, Semiometra petitclerci (CAILLET, 1923), hitherto an extreme rarity in the Jurassic sequences of France and Germany. The present record extends the geographic distribution of the species in Europe, to evidence a wider range of the genus Semiometra GISLEN, 1924, prior to its fairly common occurrence and higher diversity during the Late Cretaceous.

Słowa kluczowe

EN

Comatulida; Crinoidea; Oxfordian; Poland; taxonomy; Upper Jurassic

PL

górna jura; liliowce; liliowce beztrzoneczkowe; oksford; Polska; taksonomia

• Wydawca: Faculty of Geology of the University of Warsaw ; Komitet Nauk Geologicznych PAN
• Czasopismo: Acta Geologica Polonica
• Rocznik: 2007
• Tom: Vol. 57, no. 2
• Strony: 161--167
• Opis fizyczny: Bibliogr. 24 poz.,Tabl. 2,Fot., rys.,

Twórcy

autor

Radwańska U.

• Institute of Geology, University of Warsaw, Al. Żwirki i Wigury 93, PL-02-089 Warszawa, Poland

Bibliografia

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