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A Late Middle Cambrian damesellid trilobite cranidium from Beaconsfield, Tasmania

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Jago, JB (1981) A Late Middle Cambrian damesellid trilobite cranidium from Beaconsfield, Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 115. pp. 19-20. ISSN 0080-4703

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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 completle trilobite cranidium of a member of the Damesellidae; both the
in­ ternal 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
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
Page Range: pp. 19-20
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

Copyright Royal Society of Tasmania

Date Deposited: 28 May 2012 00:43
Last Modified: 18 Nov 2014 04:36
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