The Caecilians are an order (Gymnophiona or Apoda) of amphibians which resemble earthworms or snakes. They mostly live hidden in the ground which makes them the least explored order of amphibians, and widely unknown.
Taxonomically the caecilians are divided into 5 families. The species numbers are approximate and many of these species are identified on the basis of only one specimen. It is likely that not all species have been described yet, and that some of the species described below as different may be combined into one species in future reclassifications.
* Beaked Caecilians (Rhinatrematidae) - 2 genera, 9 species
* Fish Caecilians (Ichthyophiidae) - 2 genera, 39 species
* Indian Caecilians (Uraeotyphlidae) - 1 genus, 5 species
* Tropical Caecilians (Scolecomorphidae) - 2 genera, 6 species
* Aquatic Caecilians (Typhlonectidae) - 5 genera, 13 species
* Common Caecilians (Caeciliidae) - 26 genera, 99 species