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A Late Middle Cambrian damesellid trilobite cranidium from Beaconsfield, Tasmania
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Abstract
A recent discovery confirms the presence of damesellid trilobites in a late Middle Cambrian fauna from near Beaconsfield. Jago (1980) illustrated and briefly discussed a poorly-preserved late Middle Cambrian fauna from near Beaconsfield, which was discovered by Green (1959). In February 1980, Professor D. Green, Dr M.R. Banks and a party of geology students from the University of Tasmania collected further fossils from this locality. The fossils include the best preserved specimen (Plate 1, figs. 1 and 2)so far found at this locality. It is a substantially complete trilobite cranidium of a member of the Damesellidae; both the internal and external moulds are available. Of the specimens figured in Jago (1980) the cranidium figured in pl.1, fig. 17 and the pygidium figured in pl.1, fig. 21 probably belong in the same species as the newly discovered cranidium. As far as can be determined, the Beaconsfield specimens probably belong in a new genus of the Damesellidae, which is characterized by a substantial spine emerging from the posterior margin of the occipita1 ring and a glabel1a, with a broadly rounded anterior, which stops well short of the anterior margin of the cranidium. However, the preservation is not adequate to warrant formal description of the material and the erection of either a new species or a new genus.
Item Type: | Article |
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Authors/Creators: | Jago, JB |
Keywords: | Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library |
Journal or Publication Title: | Papers and Proceedings of the Royal Society of Tasmania |
ISSN: | 0080-4703 |
DOI / ID Number: | https://doi.org/10.26749/rstpp.115.19 |
Collections: | Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania |
Additional Information: | Copyright Royal Society of Tasmania |
Item Statistics: | View statistics for this item |
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