Practice question

Order Gymnophiona also termed Apoda includes caecilians elongate worm-like limbless burrowing amphibians of tropical soils and leaf litter characterized by annulated skin with embedded dermal scales in transverse folds, highly reduced eyes covered by skin or bone, unique sensory tentacle between eye and nostril detecting chemical cues for subterranean navigation. Tail absent, skull heavily ossified zygokrotaphic adapted for burrowing pushing. Internal fertilization via eversible phallodeum unique among amphibians, many viviparous embryos fed by uterine milk or oviparous with direct development, representing third amphibian lineage within Lissamphibia.