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A reexamination of Waikalasma (Cirripedia: Thoracica) and its significance in balanomorph phylogeny

Published online by Cambridge University Press:  14 July 2015

John S. Buckeridge  and
William A. Newman
John S. Buckeridge
Affiliation:
Carrington Polytechnic, Mount Albert, AK 3, New Zealand
William A. Newman
Affiliation:
Scripps Institution of Oceanography, La Jolla, California 92093
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Extract

When waikalasma was first recorded from early Miocene strata in New Zealand (Buckeridge, 1983) it was described as possessing eight compartmental plates but lacking basal whorls of imbricating plates. However, subsequent study and comparison of the holotype with extant Chionelasmus has shown that the remnants of several small plates remaining at the base of the rostrum represent the remains of two or three basal whorls (Figure 1). Furthermore, new evidence concerning the structure of the wall of the Chionelasmatinae has indicated not only that the true or median latus has been replaced by the carinolatus in balanomorphs, but that an additional or secondary carinolatus has been added in higher balanomorphs (Yamaguchi and Newman, 1990). The structure of the wall in Waikalasma can now be reinterpreted in light of these findings (Figure 2). It turns out, in terms of current phylogeny, that Waikalasma should be placed amongst the most primitive of the balanomorph barnacles, representing an important step in balanomorph evolution rather than simply an evolutionary offshoot as envisaged by Buckeridge (1983) and Foster and Buckeridge (1987) (Figure 3).

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 66 , Issue 2 , March 1992 , pp. 341 - 345
Copyright
Copyright © The Paleontological Society 

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