Phylogeny of Stegocephalians
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Description: Stegocephalians are tetrapods with digits rather than fins. Michael Laurin explores the relationship between the extant and the extinct members of this group.
The phylogeny of stegocephalians is controversial. Comparisons between various phylogenies are complicated by partly overlapping sets of terminal taxa. However, recent studies by Carroll (1995), Laurin and Reisz (1997, 1999), Laurin (1998a-c), and Vallin and Laurin (2004) agree in most respects. The minor differences between them reflect primarily the choice of included taxa. Here is a strict consensus of the four most parsimonious trees found by Carroll (1995):
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