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Journal Molluscan Studies Advance Access published online on June 28, 2005
Journal of Molluscan Studies, doi:10.1093/mollus/eyi029
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© The Author 2005. Published by Oxford University Studies on behalf of The Malacological Society of London, all rights reserved
Received May 27, 2004
Accepted December 8, 2005

Article

The opercula of neritopsid gastropods and their phylogenetic importance

Andrzej Kaim 1* and Przemyslaw Sztajner 2

1 Instytut Paleobiologii PAN, ul. Twarda 51/55, PL-00-818 Warszawa, Poland
2 Zaklad Geologii i Paleogeografii, Instytut Nauk o Morzu, Uniwersytet Szczecinski, ul. Felczaka 3a, PL-71-412 Szczecin, Poland

* To whom correspondence should be addressed.
Andrzej Kaim, E-mail: kaim{at}twarda.pan.pl


  Abstract

The fossil record of neritopsid opercula and shells shows that the shell shape typical for Neritopsidae and Neritidae appeared in the Triassic. The ancestors of Neritimorpha were most probably forms similar to Naticopsis. The operculum of Recent Neritopsis is composed of two calcitic parts secreted from inside and an aragonitic callus deposited from outside. Similar neritopsid opercula were already present in the Late Triassic. The first opercula with asymmetrically situated muscle scars, possibly ancestral for neritids, also appeared at that time.


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This article has been cited by other articles:


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 Journal of PaleontologyHome page
J. W. M. JAGT and S. KIEL
THE OPERCULUM OF OTOSTOMA RETZII (NILSSON, 1827) (GASTROPODA, NERITIDAE; LATE CRETACEOUS) AND ITS PHYLOGENETIC SIGNIFICANCE
Journal of Paleontology, January 1, 2008; 82(1): 201 - 205.
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