Table 1. Summary of relevant sand-dwelling squamate reptiles [9], [28].

Family	4 well-developed limbs		limbs reduced or absent
	Sand-diving (burial only)	Sand-swimming (locomotion below sand)	Sand-diving or -swimming
Phrynosomatidae	Callisaurus draconoides
	Cophosaurus texanus
	Phrynosoma spp.
	Uma notata
Tropiduridae	Liolaemus spp.
	Tropidurus spp.
Agamidae	Agama etoshae
	Phrynocephalus spp.
Lacertidae	Eremias spp.
	Meroles spp.	Meroles anchietae
Gerrhosauridae	Angolosaurus skoogi	Angolosaurus skoogi
Scincidae	Ctenotus spp.		Acontias spp.
	Eremiascincus spp.	Eremiascincus spp.	Chalcides (Sphenops) spp.
	Scincopus fasciatus		Cryptoscincus minimus
	Scincus spp.	Scincus spp.	Lerista spp.
	Trachylepis acutilabris		Neoseps reynoldsi
			Pygomeles spp.
Gymnophthalmidae			Calyptommatus spp.
			Notobachia spp.
			Procellosaurinus spp.
			Vanzoia rubricauda
Amphisbaenidae			Amphisbaena spp.
			Bipes spp.
Trogonophidae			Agamodon spp.
			Diplometopon zarudnyi
			Pachypalaminus sp.
			Trogonophis wiegmanni
Leptotyphlopidae			Leptotyphlops spp.
Typhlopidae			Typhlops spp.
Boidae			Eryx spp.
			Gongylophis spp.
			Lichanura spp.
Colubridae			Chilomeniscus spp.
			Chionactis spp.
			Phimophis spp.
Elapidae			Simoselaps bertholdi
Viperidae			Bitis peringueyi
			Cerastes vipera