Ilysiidae Xenopeltidae Colubridae Aglypha Typhlopidae Boidae Glauconiidae 'This means that the Boidae retain most primitive characters.
2
The solitary Xenopeltis is in several ways intermediate between Boidae and Ilysiidae.
3
The Boidae comprise some 60 species, which have been grouped into many fancy genera.
4
Boulenger rightly considers this snake in various ways intermediate between the Ilysiidae, Boidae and Colubridae.
5
All Boidae possess vestiges of pelvis and hind limbs, appearing externally as claw-like spurs on each side of the vent, but they are so small that they are practically without function in climbing.