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A phylogenetic analysis of 14 Devonian dipnoan taxa, using 48 cranial and dental characters has yilded a single most parsimonious pattern of relationships. The study of interrelationships among these Devonian taxa permits us to evaluate the evolutionary history of anterior skull elongation among Devonian dipnoans. The results of preliminary study suppor previous proposals that skull elongation has occured several times among Devonian dipnoans, as part of an extraordinary early diversification of this group.