A new deep-water Upper Ordovician (Caradocian) trilobite fauna from south-west Wales
✍ Scribed by Richard A. Fortey
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 548 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0072-1050
- DOI
- 10.1002/gj.1042
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✦ Synopsis
Abstract
A deep‐water trilobite fauna has been discovered in the otherwise graptolitic Mydrim Formation near Clarbeston Road, Pembrokeshire, south‐west Wales. Associated graptolites indicate an early Caradocian age. The trilobites comprise three species with eyes reduced or absent, representing an atheloptic assemblage with benthic life habits, which appeared during a short period of relative oxygenation of the Welsh Basin. The trilobite Platycalymene dilatata (Tullberg) is redescribed from the type material from Sweden, and new material from Wales is assigned to this species. Two new species are described in addition. Rorringtonia multisegmentata sp. nov. possesses twelve thoracic segments, which has implications for the classification of the Rorringtoniidae within the Aulacopleuroidea. Trinucleus conollyi sp. nov. differs from T. fimbriatus in the proliferation of the radial sulci. Copyright © 2006 John Wiley & Sons, Ltd.