Caecilians are a group of limbless, vermiform (worm-shaped) or serpentine (snake-shaped) amphibians with small or sometimes nonexistent eyes. They mostly live hidden in soil or in streambeds, and this cryptic lifestyle renders caecilians among the least familiar amphibians. Modern caecilians live in the tropics of South and Central America, Africa, and southern Asia. Caecilians feed on small subterranean creatures such as earthworms. The body is cylindrical and often darkly coloured, and the skull is bullet-shaped and strongly built. Caecilian heads have several unique adaptations, including fused cranial and jaw bones, a two-part system of jaw muscles, and a chemosensory tentacle in front of the eye. The skin is slimy and bears ringlike markings or grooves and may contain scales.
Rhinatrematidae is a family of caecilians, also known as the Neotropical tailed caecilians, American tailed caecilians. or beaked caecilians. They are found in the equatorial countries of South America.
The Ichthyophiidae are the family of Asiatic tailed caecilians or fish caecilians found in South and Southeast Asia as well as southernmost China.
The Scolecomorphidae are a family of caecilians also known as tropical caecilians, buried-eyed caecilians, or African caecilians. They are found in Cameroon in West Africa, and Malawi and Tanzania in East Africa. Caecilians are legless amphibians which superficially resemble worms or snakes.
Caeciliidae is the family of common caecilians. They are found in Central and South America. Like other caecilians, they superficially resemble worms or snakes.
Uraeotyphlus interruptus, also known as the Chengalam caecilian, is a species of caecilian in the family Ichthyophiidae. It is endemic to the Western Ghats in southern India and is only known from its type locality, Chengalam village in Kerala.
Uraeotyphlus malabaricus is a species of caecilian in the family Ichthyophiidae. It is endemic to the Western Ghats of India and is known from its type locality, "Malabar" in Kerala, and from the Nilgiri mountains in Tamil Nadu. It is known with several common names: Malabar tailed caecilian, Nilgiris caecilian, Malabar caecilian, and white-lipped caecilian.
The Western Ghats in India are home to several species of caecilians (Gymnophiona). Caecilians are legless, burrowing amphibians which mostly live in leaf litter, loose soil, under rocks and decaying logs. They are also found in agricultural fields and only surface during the monsoon. The body is elongated and smooth with a slimy skin. The smaller caecilians superficially resemble earthworms while the larger ones are often mistaken for snakes. However, they can be told apart from earthworms by the presence of eyes, teeth and skeleton and from snakes by the lack of scales on skin. The eyes in caecilians are not well developed which is most likely to be because of their burrowing life style. They are considered as rare which is apparently due to their subterranean habits. To see them one has to search carefully and be at the right place and at the right time. There are few places where they are common, but, at least one species was reported to be abundant in agricultural fields in Kerala. The larger caecilians can resemble snakes, but their skin is smooth, not scaly.
Boulengerula fischeri is a species of caecilian in the family Herpelidae. It is endemic to Rwanda and only known from around its type locality near Cyangugu, southwestern Rwanda. The specific name fischeri honours Eberhard Fischer, a German botanist who has worked with Rwandan fauna and flora. Common name Fischer's African caecilian has been coined for it. Live animals have the appearance of "live pink spaghetti".
Mimosiphonops is a genus of caecilians in the family Siphonopidae. The genus is definitely known only from the state of Rio de Janeiro, Brazil. They are sometimes known as the worm patterned caecilians.
Schistometopum thomense is a species of amphibian in the family Dermophiidae, endemic to São Tomé and Ilhéu das Rolas. It is found in most soils on São Tomé, from tropical moist lowland forests to coastal coconut plantations. It is absent only from the driest northern areas of the island. It is typically around 30 cm (12 in) in length, and is often bright yellow. The size of S. thomense can vary throughout São Tomé, however, and it is the only known caecilian to follow Bergmann's rule, which states that a decreasing temperature due to factors such as increasing altitude will cause an increase in the body size of endothermic vertebrate species. The island of São Tomé is a massive shield volcano, and it therefore has differing altitudes throughout the island, potentially resulting in the size diversity of S. thomense. This species may be referred to as the São Tomé caecilian, as the Agua Ize caecilian, or as the island caecilian, or by the local name of cobra bobo.
The Koh Tao Island caecilian is a species of amphibian in the family Ichthyophiidae found in Cambodia, Laos, Myanmar, Thailand, and Vietnam. Also known as the Ichthyophis bannanicus, the Banna caecilian, it is also found in southern China.
Crotaphatrema lamottei, the Mount Oku caecilian or Lamotte's caecilian, is a species of caecilian in the family Scolecomorphidae. It is endemic to Mount Oku in Cameroon. The specific name lamottei honours Maxime Lamotte, French biologist. There is some doubt whether Crotaphatrema tchabalmbaboensis really is distinct from this species.
Uraeotyphlus oommeni, sometimes known as the Oommen's caecilian, Oommen's Uraeotyphlus, or Bonnacord caecilian, is a species of caecilian in the family Ichthyophiidae. Within Uraeotyphlus, it belongs to the U. malabaricus group showing no obvious external differentiation between primary and higher-order annuli. This species is endemic to the Western Ghats and only known from its type locality, Bonaccord, Thiruvananthapuram district, southern Kerala. Very little is known about this species known only from a single specimen collected from an imprecise location.
Uraeotyphlus gansi, the Gansi caecilian, is a rare species of caecilian, endemic to the Western Ghats of India. It was discovered in the Kaakkaachi-Naalumukku area of the Kalakkad Mundanthurai Tiger Reserve. U. gansi was named after Carl Gans (1923–2009), a renowned herpetologist from Texas.
Gegeneophis is a genus of amphibians in the family Grandisoniidae. They are found in southern and northeastern India.
Indotyphlus is a small genus of caecilians in the family Grandisoniidae. As caecilians in general, they superficially resemble earthworms. The genus is endemic to the Western Ghats, India. They are sometimes known as Battersby's caecilians.
The Siphonopidae are the family of common caecilians. They are found in Central and South America. Like other caecilians, they superficially resemble worms or snakes.
Ichthyophis khumhzi, the Khumhzi striped ichthyophis, is a species of caecilian found in India. It has narrow and irregular lateral yellow stripes. It can attain lengths larger than 400 mm (16 in). Its head is V-shaped while short; the animal shows scales as far anterior as its collars. The species is named after Khumhzi village, where the specimens were first collected.
