Jamieson, B.G.M. 1995c. The
spermatozoa of the Squamata (Reptilia) with phylogenetic
considerations. In Advances in Spermatozoal Phylogeny and Taxonomy.
Jamieson, B.G.M., Ausio, J. and Justine, J.-L. eds. pp. 359-383.
Mémoires du Muséum national d'Histoire Naturelle, vol.
Comparative ultrastructure of squamate
families is reviewed, with new data for the South African chamaeleon,
Parsimony analysis is conducted, using Chelonia
outgroup and branch and bound searching. Two major spermatozoal
for the Squamata are extension of the fibrous sheath into the midpiece
computed) the paracrystalline subacrosomal cone. Further synapomorphies
the Squamata sensu strictu are a single perforatorium in place of the
three of Sphenodontida and Chelonia; loss of the endonuclear canal;
sinuous mitochondria (possibly an artefactual parsimony resolution as a
columnar form is intuitively preferred); intermitochondrial location of
bodies (mitochondrial transformations); presence of a well developed
electron lucent region and, equivocally, arrangement of the dense
periodic rings. A major inference is polyphyly of the 'Sauria', the
Scincomorpha and the Scincidae. Sphenomorphus group and egemid skinks
close relationship to Eugongylus-group skinks which form the
the pygopodid Lialis. Snakes
are the sister-group of the
clade. Gekkonidae appear to be a relatively plesiomorphic group,
several families from the Pygopodidae. The Iguania is not a
assemblage, iguanids and Pogona occur
in the same clade but Pogona
be the sister-taxon of Varanus.
Another iguanian, the chamaeleon
has an unresolved relationship with the
gekkonid+snake+pygopodid+Eugongylus-clade. Sphenomorph and egemid
an unresolved clade with Chalcides and
lacertids but linkage of
the Teiidae in the Lacertoidea is not upheld. Pending further
a larger number of taxa, these results can only be considered heuristic.