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3. On the Phylogeny of the Tunicata

Published online by Cambridge University Press:  15 September 2014

W. A. Herdman
W. A. Herdman
Affiliation:
Professor of Natural History in University College, Liverpool.
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Abstract

This paper deals with the relationships between the different groups of Tunicata, and the attempt is made to trace their phylogeny, and to construct a tree-like figure, showing the course of evolution of the group, and based upon anatomical and enbryological observations. The following are the chief results which are discussed:—

The Proto-Tunicata were derived from the Proto-Chordata by degeneration and modification, and they are represented at the present time by the Appendiculariidæ.

The Proto-Thaliacea and the Proto-Ascidiacea diverged in two different directions from the Proto-Tunicata, close to the ancestral Appendiculariidæ. The Doliolidæ and the Salpidæ form two divergent lines from the Proto-Thaliacea. Anchinia is an offshoot from the ancestral Doliolidæ.

Type
Proceedings 1885-86
Information
Proceedings of the Royal Society of Edinburgh , Volume 13 , 1886 , pp. 444 - 445
Copyright
Copyright © Royal Society of Edinburgh 1886

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