Table 1.

The range of diploid numbers in amniotes (Christidis 1990; Hayman 1990; O’Brien et al. 2006; Olmo and Signorino 2005; Valenzuela and Adams 2011)

	Diploid chromosome numbers			Microchromosomes
	Smallest	Largest	Commona
Birds	40	136–142	80	Yes
Crocodiles	30	42		No
Turtles	28	66		Yes
Snakes	30	42	36	Yes
Lizards	24	46		Yesb
Legless Lizards	30	50		Yes
Monotremes	52	64		No
Marsupials	10	32	14 and 22	No
Eutherians	6	102		No

^aOnly given for groups were there is a common diploid number

^bAbsent from some species