THE OPERCULUM OF OTOSTOMA RETZII (NILSSON, 1827) (GASTROPODA, NERITIDAE; LATE CRETACEOUS) AND ITS PHYLOGENETIC SIGNIFICANCE

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THE OPERCULUM OF OTOSTOMA RETZII (NILSSON, 1827) (GASTROPODA, NERITIDAE; LATE CRETACEOUS) AND ITS PHYLOGENETIC SIGNIFICANCE Powered By Docstoc
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Description: A clear distinction between neritids and neritopsids has long been established, based on the dissolution of internal shell walls; neritoids resorb the inner walls, while neritopsids do not (Gray, 1847; Fischer, 1875).\n Triger, at Gueullen [sic; read Geulhem], west of Fauquemont (nowadays Valkenburg aan de Geul, The Netherlands) and noted that one of the specimens retained "flammules brunes en zigzag, restes de son ancienne coloration" ("brown flames in zigzag pattern, remnants of its former coloration"). ACKNOWLEDGMENTS We thank J. Severijns (Maastricht) for donation of material, A. S. Schulp (Natuurhistorisch Museum Maastricht) for preparation of photographs and silicone rubber peels of opercula, the management of HeidelbergCement Group (ENCI-Maastricht) for access to their quarry grounds, and A. Kaim (Polska Akademia Nauk, Instytut Paleobiologii, Warsaw) and L. R. Saul (Natural History Museum of Los Angeles County, Los Angeles) for highly constructive comments on an earlier typescript.
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