ROSSELLA BROMLEYI N. SP.: THE FIRST ENTIRELY PRESERVED FOSSIL SPONGE SPECIES OF THE GENUS ROSSELLA (HEXACTINELLIDA) FROM THE UPPER CRETACEOUS OF BORNHOLM, DENMARK

ANKE BRÜCKNER; DORTE JANUSSEN

doi:10.1666/0022-3360(2005)079<0021:RBNSTF>2.0.CO;2

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ANKE BRÜCKNER,¹ DORTE JANUSSEN²

¹FU Berlin, Institut für Geologische Wissenschaften, Paläontologie, Malteserstr. 74-100, Haus D, D-12249 Berlin, Germany, < > anke.brueckner@senckenberg.de
²Forschungsinstitut und Naturmuseum Senckenberg, Sektion Marine Evertebraten I, Senckenberganlage 25, 60325 Frankfurt/M., Germany, < > dorte.janussen@senckenberg.de

Abstract

A new lyssacinosan hexactinellid, Rossella bromleyi n. sp., is described from the Upper Cretaceous of Arnager Pynt, Bornholm (Denmark). The sponge shows a cup-shaped form with a broad, moderately dense root tuft, which contains three- and four-rayed orthotropal anchors characteristic for Rossella. The skeleton is composed of bundles of diactines, hexactines of two orders, and pentactines. Diactine bundles are mainly in the growth direction or diagonal to it. Prostalia lateralia are pentactines with the paratangential rays protruding beyond the outer surface of the sponge body. Hypodermalia are absent.

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ANKE BRÜCKNER and DORTE JANUSSEN "ROSSELLA BROMLEYI N. SP.: THE FIRST ENTIRELY PRESERVED FOSSIL SPONGE SPECIES OF THE GENUS ROSSELLA (HEXACTINELLIDA) FROM THE UPPER CRETACEOUS OF BORNHOLM, DENMARK," Journal of Paleontology 79(1), 21-28, (1 January 2005). https://doi.org/10.1666/0022-3360(2005)079<0021:RBNSTF>2.0.CO;2

Accepted: 1 April 2004; Published: 1 January 2005

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