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.

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The bilobate nature of the earlier growth stage of the Stringocephalus cardinal process was described...

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