Xenosauridae
13 species.
- Arboreal Knob-scaled LizardXenosaurus arboreus
- Chin-spotted Knob-scaled LizardXenosaurus phalaroanthereon
- Flathead Knob-scaled LizardXenosaurus platyceps
- Knob-scaled LizardXenosaurus grandis
- Mountain Knob-scaled LizardXenosaurus agrenon
- Newman's Knob-scaled LizardXenosaurus newmanorum
- Pallid Knob-scaled LizardXenosaurus rectocollaris
- Pena's Knob-scaled LizardXenosaurus penai
- Rackham’s Knob-scaled LizardXenosaurus rackhami
- San Martin Knob-scaled LizardXenosaurus sanmartinensis
- Zacualtipá́n Knob-scaled LizardXenosaurus tzacualtipantecus
- Xenosaurus fractus
- Xenosaurus mendozai