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Journal Article

The Head Shield of Macropetalichthys (Arthrodira)

Leigh Van Valen
Journal of Paleontology
Vol. 37, No. 1 (Jan., 1963), pp. 257-263
Stable URL: http://www.jstor.org/stable/1301427
Page Count: 7

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Topics: Canals, Bones, Skull, Fish, Synonyms, Shoulder, Shales, Orbital bone, Genera, Cranium
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The Head Shield of Macropetalichthys (Arthrodira)
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Abstract

A new set of homologies of the bones of the head shield of Macropetalichthys is derived from a comparison with the pattern of the recently described Aethaspis ohioensis. The latter species appears to be near the common ancestry of the Phyllolepida, Petalichthyida, and Euarthrodira on both stratigraphical and morphological evidence.

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