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File:Tetragraptus approximatus 1.png

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Tetragraptus approximatus

Summary

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Description
English: Tetragraptus approximatus. Top: fragment of one of the stypes, magnified. Bottom: Nearly perfect specimen.
Date
Source Henry Alleyne Nicholson (1873). "On some Fossils from the Quebec Group of Point Lévis, Quebec". The Annals and Magazine of Natural History, including Zoology, Botany, and Geology. 4th Series 11: 133–143.
Author Henry Alleyne Nicholson

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