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The Ontogeny of the Trilobite Dalmanitina olini

Published online by Cambridge University Press:  01 May 2009

J. T. Temple
J. T. Temple
Affiliation:
Department of Geology, University College, Gower Street, London, W.C.1
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Abstract

The ontogeny of Dalmanitina olini Temple (Upper Ordovician) is described on the basis of specimens from Scania and North Wales. The development is similar to that of D. socialis (Barrande), but good preservation has enabled some detailed changes in the cephalon to be followed. The protaspid and early post-protaspid stages bear an anterior pit in each axial furrow opposite the frontal lobe. The protaspid anterior glabellar furrow becomes joined to this pit by an oblique furrow, and forms with the latter a composite oblique furrow which develops into the adult anterior-glabellar furrow. This mode of development is considered probably to be common to all Phacopids: the significance of the anterior pits in this family is discussed. Preliminary observations are made on the growth-rates of various parts of the glabella, and the frontal lobe is found to grow in length (sag.) at a rate approximately equal to that of the rest of the glabella.

Type
Articles
Information
Geological Magazine , Volume 89 , Issue 4 , August 1952 , pp. 251 - 262
Copyright
Copyright © Cambridge University Press 1952

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References

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