The Erycinae, also known as the Old World sand boas,[1] are a subfamilyofnonvenomoussnakes in the familyBoidae. Species of the subfamily Erycinae are found in Europe, Asia Minor, Africa, Arabia, central and southwestern Asia, India, Sri Lanka, and western North America. Four genera comprising 18 species are currently recognized as being valid.[1]
Erycinae is a subfamily of stout-bodied snakes, all of which are competent burrowers. The largest, E. johnii, rarely exceeds 120 cm (47 in) in total length (including tail). Most grow to around 60 cm (24 in) in total length. They have small eyes and hard, small scales to protect their skin from the grit of sand. A great deal of sexual dimorphism exists, with females generally becoming much larger than males.
Erycines have skeletal adaptations to burrowing. The skull is more compact than in the subfamily Boinae. Also, the vertebrae of the tail are increased in size but reduced in number.[2]
Erycines are found in Southeastern Europe, Asia Minor, North, Central, West and East Africa, Arabia, Central and Southwest Asia, India, Sri Lanka, southwestern Canada, the western United States, and northwestern Mexico.[3]
Fossil erycines have been found in rock strata over 50 million years old, and were once widespread in North America. Now, only four species remain in North America, as well as the Old World sand boas proper in Africa, Asia, and Southeastern Europe.
The majority of sand boas spend much of their time basking below the surface of the sand, with only their eyes or head exposed. When potential prey approaches, they erupt out of the sand, bite, and employ constriction to subdue it.
Otherwise far removed from their boine relatives, erycines are generally ovoviviparous, i.e., giving birth to live young. At least two species lay eggs, however: the Arabian sand boa, Eryx jayakari, and the West African sand boa, Eryx muelleri.
Poaching and smuggling of sand boas is often reported in India.[5][6][7][8] Most of the smuggled snakes go to the United States.[9][better source needed] There is a misconception about their medicinal and aphrodisiacal properties, as well as the belief that keeping this snake as a pet brings wealth and prosperity.[10]
Eryx colubrinus, E. conicus and E. johnii are frequently available in the exotic pet trade and are often captive-bred. They breed readily, their small size making them an attractive option. They are usually not aggressive species, though they sometimes have a tendency to bite, and also spend the vast majority of their time hiding. Other species are not commonly available, but are occasionally imported.
Bonaparte, Carlo Luciano (1831). Saggio di una distribuzione metodica degli animali vertebrati. Rome: Antonio Boulzaler. 144 pp. (Subfamily "Erycina [sic]", p. 67). (inItalian).
Goin, C.J.; Goin, O.B.; Zug, G.R. (1978). Introduction to Herpetology. Third Edition. San Francisco: W.H. Freeman and Company. xi + 378 pp. ISBN0-7167-0020-4. (Subfamily Erycinae, p. 319).
Media related to Erycinae at Wikimedia Commons
