Genus Heloderma (Beaded Lizards) (Sauria: Helodermatidae)
regions with most species  (as of 31st December 2018)

© Rune Midtgaard
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*Regions with same number of species are ranked alphabetically
Rank* Region Species 
No. 1
Mexico
 4
No. 2
Sinaloa [Mexico]
 3
No. 3
Chiapas [Mexico]
 2
No. 4
Durango [Mexico]
 2
No. 5
Guatemala
 2
No. 6
Sonora [Mexico]
 2
No. 7
Arizona [USA]
 1
No. 8
California [USA]
 1
No. 9
Chihuahua [Mexico]
 1
No. 10
Colima [Mexico]
 1
No. 11
Guerrero [Mexico]
 1
No. 12
Jalisco [Mexico]
 1
No. 13
Mexico state [Mexico]
 1
No. 14
Mexico state [Mexico]
 1
No. 15
Michoacan [Mexico]
 1
No. 16
Morelos [Mexico]
 1
No. 17
Nayarit [Mexico]
 1
No. 18
Nevada [USA]
 1
No. 19
New Mexico [USA]
 1
No. 20
Oaxaca [Mexico]
 1
No. 21
Puebla [Mexico]
 1
No. 22
USA
 1
No. 23
Utah [USA]
 1
No. 24
Zacatecas [Mexico]
 1