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Heterochrony in Stringocephalus

Published online by Cambridge University Press:  20 May 2016

Andrzej Balinski ,
Sun Yuanlin  and
A. J. Boucot
Andrzej Balinski
Affiliation:
Instytut Paleobiologii, Polska Akademia Nauk, ul. Twarda 51/55, PL-00-818, Warsaw, Poland,
Sun Yuanlin
Affiliation:
Department of Geology, Peking University, Beijing 100871, China,
A. J. Boucot
Affiliation:
Department of Zoology, Oregon State University, Corvallis, 97331-2914, U.S.,
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Extract

Sun and Boucot (1999) described the ontogenetic development of several important morphologic structures in Stringocephalus gubiensis, which occurs in the late Eifelian kockelianus Zone of South China. They found that in small specimens ranging from 5 to 18 mm in width the cardinal process forms a pair of discrete, rodlike lobes (Sun and Boucot, 1999, Figs. 1.1–1.6, 2.1–2.6). In specimens generally exceeding 20 mm in width, these lobes fuse to form the single, long, terminally bifid, stalklike cardinal process characteristic of Stringocephalus.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 74 , Issue 6 , November 2000 , pp. 1181 - 1183
Copyright
Copyright © The Paleontological Society

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References

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