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Paper on drepanosaurids



Because they occassionally rear their plucked-chicken-like heads on the
list:

Senter, P. 2004. Phylogeny of Drepanosauridae (Reptilia: Diapsida). Journal
of Systematic Palaeontology 2 (3): 257-268.
Available for Fwee!
http://journals.cambridge.org/bin/bladerunner?30REQEVENT=&REQAUTH=0&117000RE
QSUB=&REQINT1=252638

"Phylogenetic analysis reveals that the Triassic diapsid family
Drepanosauridae is closely related to Coelurosauravus and Longisquama. These
three taxa are part of a clade for which the name Avicephala (defined as all
taxa more closely related to Coelurosauravus and Megalancosaurus than to
Neodiapsida) is coined. Avicephala is a sister taxon to Neodiapsida. The
name Simiosauria is erected for the clade composed of all taxa more closely
related to Drepanosauridae than to Coelurosauravus or Sauria. Simiosauria is
composed of MCSNB 4751 + (Hypuronector + Drepanosauridae). Drepanosauridae
is composed of Drepanosaurus + (Dolabrosaurus + Megalancosaurus).
Arboreality is probably plesiomorphic for Avicephala and no convincing
evidence exists that any simiosaurian was aquatic."

Amongst the conclusions: Drepanosaurids are stem group diapsids, not
archosauromorphs, and not related to prolacertiformes. Archaeopteryx,
Ornitholestes and Sinosauropteryx were included in the analysis to test the
Feducci-oid theory that birds are derived from Avicephala - they're not.
Pterosaurs were not included, and not even mentioned in the article.
Tree:

0--Palaeothyris
 `--+--Petrolacosaurus
    `--+--Avicephala
       |        |--+--Longisquama
       |        |  `--Coelurosauravus
       |        `--Drepanosauridae
       `--+--Youngina
          `--+--Gephyrosaurus (for Lepidosauria)
             `--+--Mesosuchus
                `--+--Prolacertiformes (incl. Tanystropheidae)
                   `--Archosauriformes

    Forgive my ignorance, but what sort of a beastie is _Mesosuchus_?