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A vermiform problematicum from the Dinantian of Foulden, Berwickshire, Scotland

Published online by Cambridge University Press:  03 November 2011

John E. Almond
John E. Almond
Affiliation:
Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, England.
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Abstract

A unique specimen of an unusual elongate segmented compression fossil, Polylurida aenigmatica n. gen., n. sp., is described and illustrated. The bilaterally-symmetrical, dorsoventral structure (c. 6·5 cm long × 0·8 cm maximum width) narrows towards both ends and is subdivided into approximately 19 similar tapering segments, showing no evidence of tagmosis, appendages or an internal gut. The segments are covered with a substantial papillose organic cuticle, each segment bearing towards one end a pair of transverse calcareous bars. These bars are perforated by simple canals filled with strands of dark organic material which traverse their whole thickness and flare out superficially to form pores on both their lower and upper surfaces. Internal horizontal lamination of the bar material suggests an episodic accretionary pattern of skeletal growth. The bars appear to represent internal skeletal structures and are restricted to one side (dorsal or ventral) of the body, where the adjacent cuticle is locally thickened to form a corresponding series of discrete paired densely papillose transverse bands. Although Polyurida may be an unusual segmented worm, its singular suite of characters and lack of data prevent assignment to any higher taxon.

Keywords

ArthropodaCarboniferousPolyluridaworm
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 76 , Issue 1 , 1985 , pp. 41 - 47
Copyright
Copyright © Royal Society of Edinburgh 1985

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References

Barnes, R. D. 1980. Invertebrate zoology, 4th edn. New York: Holt, Reinhart & Winston.Google Scholar
Clarkson, E. N. K. 1985. Palaeoecology of the Dinantian of Foulden, Berwickshire, Scotland. TRANS R SOC EDINBURGH EARTH SCI 76, 97–100.CrossRefGoogle Scholar
Conway-Morris, S. 1979. The Burgess Shale (Middle Cambrian) fauna. ANN REV ECOL SYST 10, 327–49.Google Scholar
Francis, E. H. 1983. Carboniferous. In Craig, G. Y. (ed.) Geology of Scotland 2nd edn, 253–96. Edinburgh: Scottish Academic Press.Google Scholar
Howell, B. F. 1962. Worms. In Moore, R. C. (ed.) Treatise on invertebrate paleontology, part W, Miscellanea, W144-77. Lawrence, Kansas: Geological Society of America & University of Kansas.Google Scholar
Thompson, I. 1979. Errant polychaetes (Annelida) from the Pennsylvanian Essex Fauna of northern Illinois. PALAEONTOGRAPHICA A163, 163–99.Google Scholar
Whittington, H. B. 1980. Exoskeleton, moult stage, appendage morphology and habits of the Middle Cambrian trilobite Olenoides serratus. PALAEONTOLOGY 23, 171–204.Google Scholar
Wood, S. P. & Rolfe, W. D. I. 1985. Introduction to the palaeontology and sedimentology of the Dinantian of Foulden, Berwickshire, Scotland. TRANS R SOC EDINBURGH EARTH SCI 76, 1–6.CrossRefGoogle Scholar