The Diapsid reference article from the English Wikipedia on 24-Jul-2004
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Diapsid

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Diapsids
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Subphylum:Vertebrata
Infraphylum:Tetrapoda
Microphylum:Amniota
Nanophylum:Sauropsida
Superclass:Diapsida
Classes
Ichthyoptergia
Sauropterygia
Lepidosauria
Archosauria
Diapsids are a subgroup of the tetrapods (greek: four-legged animals). They are named after the two openings in their skull. Cf. Synapsid (one opening)

External link

http://www.ucmp.berkeley.edu/vertebrates/tetrapods/tetraintro.html