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astogeny

Earth and Environmental Science Transactions of The Royal Society of Edinburgh (1)

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The tuning fork graptoloid, Didymograptus murchisoni (Beck, 1839)
R. B. Rickards, M. S. Khashogji
Journal:

Transactions of the Royal Society of Edinburgh: Earth Sciences / Volume 90 / Issue 3 / 1999

Published online by Cambridge University Press:

03 November 2011, pp. 173-187

Print publication:

1999
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The development of D. (Didymograptus) murchisoni (Beck), the type species of the genus, is shown to be unequivocally of anus type, with thl1 dicalyal and a low metasicular origin of thl1. An evolutionary line from the early, Arenig, bifidus group is supported; and clear distinctions are drawn between the subgenera D. (Didymograptus), D. (Didymograptellus) and D. (Jenkinsograptus), the first of these being redefined. The range of variation of biocharacters of D. murchisoni is analysed using exquisitely preserved undeformed material from Saudi Arabia, and comparisons are made with the undeformed type material, and with undeformed (nodule) collections from Abereiddy Bay, Pembrokeshire. The astogenetically late developments of D. murchisoni are described.