Big oyster, robust echinoid: an unusual association from the Maastrichtian type area (province of Limburg, southern Netherlands)

Big oyster, robust echinoid: an unusual association from the Maastrichtian type area (province of... Large, denuded tests of holasteroid echinoids were robust benthic islands in the Late Cretaceous seas of northwest Europe. A test of Hemipneustes striatoradiatus (Leske) from the Nekum Member (Maastricht Formation; upper Maastrichtian) of southern Limburg, the Netherlands, is encrusted by a large oyster, Pycnodonte (Phygraea) vesiculare (Lamarck). This specimen is a palaeoecological conundrum, at least in part. No other members of the same oyster spatfall attached to this test and survived. Indeed, only two other, much smaller bivalve shells, assignable to the same species, attached either then or somewhat later. The oyster, although large, could have grown to this size in a single season. The larval oyster cemented high on the test and this would have been advantageous initially, the young shell being elevated above sediment-laden bottom waters. However, as the oyster grew, the incurrent margin of the commissure would have grown closer to the sediment surface. Thus, the quality of the incurrent water probably deteriorated with time. Keywords Late Cretaceous  Pycnodonte  Hemipneustes  Taphonomy  Palaeoecology Introduction et al. 2013, 2017). Associations on holasteroid tests may be monospecific or nearly so, such as dense accumulations of Large holasteroid echinoids, such as the genera pits assigned to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Swiss Journal of Palaeontology Springer Journals

Big oyster, robust echinoid: an unusual association from the Maastrichtian type area (province of Limburg, southern Netherlands)

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Akademie der Naturwissenschaften Schweiz (SCNAT)
Subject
Earth Sciences; Paleontology
ISSN
1664-2376
eISSN
1664-2384
D.O.I.
10.1007/s13358-018-0151-3
Publisher site
See Article on Publisher Site

Abstract

Large, denuded tests of holasteroid echinoids were robust benthic islands in the Late Cretaceous seas of northwest Europe. A test of Hemipneustes striatoradiatus (Leske) from the Nekum Member (Maastricht Formation; upper Maastrichtian) of southern Limburg, the Netherlands, is encrusted by a large oyster, Pycnodonte (Phygraea) vesiculare (Lamarck). This specimen is a palaeoecological conundrum, at least in part. No other members of the same oyster spatfall attached to this test and survived. Indeed, only two other, much smaller bivalve shells, assignable to the same species, attached either then or somewhat later. The oyster, although large, could have grown to this size in a single season. The larval oyster cemented high on the test and this would have been advantageous initially, the young shell being elevated above sediment-laden bottom waters. However, as the oyster grew, the incurrent margin of the commissure would have grown closer to the sediment surface. Thus, the quality of the incurrent water probably deteriorated with time. Keywords Late Cretaceous  Pycnodonte  Hemipneustes  Taphonomy  Palaeoecology Introduction et al. 2013, 2017). Associations on holasteroid tests may be monospecific or nearly so, such as dense accumulations of Large holasteroid echinoids, such as the genera pits assigned to

Journal

Swiss Journal of PalaeontologySpringer Journals

Published: Jun 1, 2018

References

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