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

Czasopismo : Acta Geologica Polonica
Tytuł artykułu : A rare comatulid crinoid, Semiometra petitclerci (CAILLET, 1923), from the Upper Oxfordian of Poland

Autorzy :
Gale, A.
School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth PO1 3QL, UK, asg@nhm.ac.uk,
Radwańska, U.
Institute of Geology, University of Warsaw, Al. Żwirki i Wigury 93, PL-02-089 Warszawa, Poland,
Abstrakty : 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 : górna jura, liliowce, liliowce beztrzoneczkowe, oksford, Polska, taksonomia, Comatulida, Crinoidea, Oxfordian, Poland, Taxonomy, Upper Jurassic,
Wydawnictwo : Faculty of Geology of the University of Warsaw
Rocznik : 2007
Numer : Vol. 57, no. 2
Strony : 161 – 167
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DOI :
Cytuj : Gale, A. ,Radwańska, U. , A rare comatulid crinoid, Semiometra petitclerci (CAILLET, 1923), from the Upper Oxfordian of Poland. Acta Geologica Polonica Vol. 57, no. 2/2007
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