Editing Amphibian (section)

=== Gymnophiona ===
[[File:Siphonops paulensis02.jpg|thumb|alt=''Siphonops paulensis''|The limbless South American caecilian ''[[Siphonops paulensis]]'']]
The order [[Gymnophiona]] (from the Greek ''gymnos'' meaning "naked" and ''ophis'' meaning "serpent") or Apoda comprises the caecilians. These are long, cylindrical, limbless animals with a snake- or [[Annelid|worm-like]] form. The adults vary in length from 8 to 75 centimetres (3 to 30 inches) with the exception of [[Caecilia thompsoni|Thomson's caecilian]] (''Caecilia thompsoni''), which can reach {{cvt|150|cm}}. A caecilian's skin has a large number of transverse folds and in some species contains tiny embedded dermal scales. It has rudimentary eyes covered in skin, which are probably limited to discerning differences in light intensity. It also has a pair of short [[tentacle]]s near the eye that can be extended and which have [[Somatosensory system|tactile]] and [[Olfaction|olfactory]] functions. Most caecilians live underground in burrows in damp soil, in rotten wood and under plant debris, but some are aquatic.{{sfn| Stebbins| Cohen | 1995 | p=4}} Most species lay their eggs underground and when the larvae hatch, they make their way to adjacent bodies of water. Others brood their eggs and the larvae undergo metamorphosis before the eggs hatch. A few species give birth to live young, nourishing them with glandular secretions while they are in the oviduct.{{sfn | Dorit | Walker | Barnes | 1991 | p=858}} Caecilians have a mostly [[Gondwana]]n distribution, being found in tropical regions of Africa, Asia and Central and South America.<ref name="Britannica">{{cite encyclopedia |url=https://www.britannica.com/EBchecked/topic/29797/Gymnophiona |title=Gymnophiona |author=Duellman, William E. |encyclopedia=Encyclopædia Britannica |access-date=September 30, 2012 |archive-date=January 14, 2012 |archive-url=https://web.archive.org/web/20120114043346/https://www.britannica.com/EBchecked/topic/29797/Gymnophiona |url-status=live }}</ref>