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First discovery of Early Palaeozoic Bathysiphon (Foraminifera) – test structure and habitat of a ‘living fossil’

Published online by Cambridge University Press:  12 April 2012

ED LANDING ,
SANDRA PATRUCCO REYES ,
AMANDA L. ANDREAS  and
SAMUEL S. BOWSER
ED LANDING*
Affiliation:
New York State Museum, 222 Madison Avenue, Albany, NY 12230USA
SANDRA PATRUCCO REYES
Affiliation:
Wadsworth Center, New York State Department of Health, P. O. Box 509, Albany, NY 12201–0509USA
AMANDA L. ANDREAS
Affiliation:
Wadsworth Center, New York State Department of Health, P. O. Box 509, Albany, NY 12201–0509USA
SAMUEL S. BOWSER
Affiliation:
Wadsworth Center, New York State Department of Health, P. O. Box 509, Albany, NY 12201–0509USA
*
†Author for correspondence: [email protected]
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Abstract

The giant, agglutinated foraminiferan Bathysiphon Sars, previously Triassic–Recent, occurs in much older sedimentary rock (Early Ordovician, late early Tremadocian) of Avalonia. The genus extends back to c. 485 Ma based on its discovery in platform mudstone of the Chesley Drive Group in Cape Breton Island, Nova Scotia. Elongate (up to 60 mm), epibenthic Bathysiphon tubes occur in wave-rippled, green-grey mudstone with a low diversity, probably dysoxic fauna. The mudstone is coeval with and lithologically similar to the Shineton Formation in Shropshire and the Welsh Borderlands. Scanning microscopy of the Bathysiphon walls shows imbricated mica grains that parallel the long axis of the tests. The lumen has a mélange of packed sediment grains, some of which are spherical structures of siliciclastic mud studded with tetrahedral pyrite crystals. A felt-like, agglutinated test, a lumen packed with spherical structures (probable stercomata) and the domal ends of some specimens are consistent with modern Bathysiphon. This report is the first time that cytoplasmic activity and stercomata formation have been used to refer fossil protists to a modern group. Bathysiphon differs from the Cambrian foraminiferan Platysolenites Pander, which has an open lumen without stercomata, but support a comparable, sediment deposit-feeding niche. Bathysiphon is truly a ‘living fossil’, with a mode of test construction, cytoplasmic activity that formed stercomata and a niche unchanged for almost 500 million years. Foraminiferans have not been found prior to the Cambrian Period, and the Early Cambrian appearance of agglutinated foraminiferans is part of the radiation of Phanerozoic communities.

Keywords

BathysiphonForaminiferastercomataLower OrdovicianTremadocianAvalonNova ScotiaCape Breton Island
Type
Original Articles
Information
Geological Magazine , Volume 149 , Issue 6 , November 2012 , pp. 1013 - 1022
Copyright
Copyright © Cambridge University Press 2012

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