V. Reptilia sensu lato-04 Systematics of modern reptiles

The presented modern reptile systematics is based on the most authoritative online database: Higher Taxa in Extant Reptiles. The phylogeny of turtles, according to the source cited in this database (A global phylogeny of turtles...), has already been developed in considerable detail and reliability. The list of families corresponds to the indicated database, and their order follows the presented phylogeny. A similar approach has been adopted for the systematics of squamates. The composition of families matches that in the database, and their order follows the phylogeny proposed in the same database.

				A similar solution has been adopted regarding the systematics of squamates. The composition of families corresponds to that specified in the database, and the order follows the phylogeny proposed in the same database.		Families
† Order Pareiasauromorpha – Pareiasauromorphs				91	1235	11677
Order Testudines – Turtles				88	1226	11650
1226				14	106	356
	106				20	100
		20
			100		3	8
			3		2	27
		2
			27		15	65
	15				86	256
		86
			256		1	1
			1		13	34
		13
			34		1	1
			1		4	6
		4
			6		2	5
			2		1	1
			1		3	31
		3
			31		1	1
			1		24	58
			24		17	47
			17		19	71
19				1	1	1
	1
			1		1	1
Order Rhynchocephalia – Rhynchocephalians				73	1119	11253
	1119			43	591	7325
		591
			7325		2	25
		2
			25		7	32
			7		7	46
			7		25	171
			25		6	44
			6		12	229
			12		10	158
			10		58	1481
		58
			1481 Superfamily Scincomorpha 9. Family Xantusiidae — Night lizards Subfamily Cricosaurinae		5	60
			5		7	38
			7		10	68
			10 68 12. Family Scincidae — Skinks Subfamily Acontinae — Sand skinks Subfamily Egerniinae — Egernias, Social skinks Subfamily Eugongylinae Subfamily Lygosominae — Lygosomas, Slender skinks Subfamily Mabuyinae — Mabuyas Subfamily Sphenomorphinae Subfamily Scincinae — True skinks		167	1744
		167
			1744		18	172
			18		1	32
			1		56	275
			“Amphisbaenia”
			275		1	1
			1		1	3
			1		1	2
			1		1	7
			1		4	6
			4		12	183
			12		43	362
		43
			362		1	5
			1		1	13
			1		3	52
			3 52 26. Family Anguidae — Slowworms Subfamily Anguinae		10	86
			10		1	1
			1		1	1
			1		1	83
		1
			83		12	222
			12 222 31. Family Agamidae — Agamas Subfamily Uromastycinae — Spiny-tailed lizards Subfamily Leiolepidinae — Butterfly agamas Subfamily Hydrosaurinae — Sail-finned lizards Subfamily Amphibolurinae — Australian agamas		62	556
			62		1	29
			1		9	44
			9		3	20
			3		3	11
			3		2	12
			2		6	142
			6		2	8
			2		6	34
			6		3	338
			3		8	170
			8		1	8
			1		1	437
	1			30	528	3968
			528 3968 1. Family Leptotyphlopidae — Slender blind snakes		12	141
			12		2	23
			2		1	1
			1		18	275
			18		4	21
			4		1	1
			1		2	35
			2		1	15
			1		1	3
			1		6	62
			6		1	2
			1		1	1
			1		11	38
			11		1	2
			1		2	2
			2 2 16. Family Boidae — Boas Subfamily Charininae Subfamily Calabariinae Subfamily Sanziniinae Subfamily Ungaliophiinae Subfamily Candoiinae		13	67
			13		1	3
			1		5	28
			5		4	41
			4 41 20. Family Viperidae — Vipers Subfamily Viperinae — True vipers		37	374
			37		29	56
			29		1	16
			1		8	55
			8 55 24. Family Atractaspididae — Burrowing vipers		12	72
			12		3	4
			3		16	89
			16		5	8
			5		22	89
			22 89 29. Family Elapidae — Elapids		53	389
			53 389 30. Family Colubridae — Colubrids Subfamily Ahaetuliinae Subfamily Sibynophiinae Subfamily Grayiinae Subfamily Colubrinae — Rat snakes Subfamily Calamariinae Subfamily Pseudoxenodontinae		255	2055
Order Squamata – Lepidosaurs
Infraclass “Archosauria” – Archosaurs				3	9	27
			9		2	2^*
			2		3	17
			3 17 3. Family Alligatoridae — Alligators		4	8

* Tomistoma schlegelii is considered within the family Gavialidae