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Journal of Paleontology; January 1968; v. 42; no. 1; p. 243
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Further note on the structure of rhipidistian fishes

Keith Stewart Thomson

Examination of the original material of the crossopterygian fish Panderichthys (Devonian, USSR) confirms that two pairs of external nares and a pars ethmoidalis cranialis are present in the snout. This 'intermediate' structure demonstrates the artificiality of any classification of the Rhipidistia into two widely separated lineages.

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