| Polemon collaris | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Suborder: | Serpentes |
| Family: | Atractaspididae |
| Genus: | Polemon |
| Species: | P. collaris |
| Binomial name | |
| Polemon collaris (Peters, 1881) | |
| Synonyms | |
Polemon collaris, or the collared snake-eater, is a species of venomous rear-fanged snake in the family Atractaspididae. [3] It is endemic to Africa. [4]
It is found in Angola, Burundi, Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Nigeria, Rwanda, and Uganda. [2]
Polemon collaris is blackish dorsally down to the outer ends of the ventrals and subcaudals. The head and the nape of the neck are pale brown, with some black blotches on the crown and below the eye. Ventrally it is white. The entire terminal caudal shield is white.
Adults are about 55 cm (21+5⁄8 in) in total length, which includes a tail about 32 mm (1+1⁄4 in) long.
Dorsal scales smooth, without apical pits, arranged in 15 rows. Ventrals 201–208; anal plate divided; subcaudals 16–22, also divided.
Diameter of eye about three fifths its distance from the mouth. Rostral broader than high, barely visible from above. Internasals considerably shorter than the prefrontals. Frontal slightly broader than the supraocular, 1½ times as long as broad, as long as its distance from the rostral, much shorter than the parietals. Nasal divided, in contact with the preocular. Usually two postoculars. Temporals 1+1 or 1+2. Seven upper labials, third and fourth entering the eye. First lower labial forming a suture with its fellow behind the mental. Four or five lower labials in contact with the anterior chin shield. Two pairs of chin shields, the anterior pair longer than the posterior pair. [5]
Three subspecies are recognized including the nominate race.
Sibynophis collaris, commonly known as the common many-toothed snake,Betty's many toothed snake or the collared black-headed snake, is a species of colubrid snake endemic to South and East Asia.
Günther's black snake, Bothrolycus ater, is a species of poorly known lamprophiid snake endemic to central Africa. It is the only member of the genus, Bothrolycus. This snake is notable as one of the few snakes with notable sexual dimorphism, as well as possessing a small pit anterior to the eye. While superficially similar to the thermal pits of vipers, its function remains unknown.
Hypoptophis is a monotypic genus created for the rear-fanged (opisthoglyphous) venomous snake species, Hypoptophis wilsonii. The species, which is endemic to Africa, is in the subfamily Aparallactinae of the family Atractaspididae. There are no subspecies that are recognized as being valid.
Macrelaps is a monotypic genus created for the rear-fanged (opisthoglyphous) venomous snake species, M. microlepidotus, endemic to South Africa. No subspecies are currently recognized.
The Cameroon racer, Poecilopholis cameronensis, is a species of rear-fanged venomous snake endemic to Africa. Poecilopholis is a monotypic genus created for this species.
Aparallactus lineatus, or the lined centipede-eater, is a species of venomous rear-fanged snake in the family Atractaspididae.
Aparallactus niger is a species of venomous rear-fanged snake in the family Atractaspididae. It is endemic to Western Africa.
Micrelaps boettgeri, commonly known as Boettger's two-headed snake, is a species of venomous rear-fanged snake in the family Atractaspididae. The species is endemic to Africa.
Polemon acanthias, or Reinhardt's snake-eater, is a species of venomous rear-fanged snake in the family Atractaspididae. It is endemic to Africa.
Polemon barthii, or the Guinea snake-eater, is a species of rear-fanged venomous snake in the family Atractaspididae. The species is endemic to Africa.
Polemon christyi, also known commonly as Christy's snake-eater and the eastern snake-eater, is a species of venomous rear-fanged snake in the subfamily Aparallactinae of the family Atractaspididae. The species is native to Central Africa and East Africa.
Polemon gabonensis, or the Gaboon snake-eater, is a species of venomous rear-fanged snake in the family Atractaspididae. It is endemic to Africa.
Polemon gracilis, or the graceful snake-eater, is a species of venomous rear-fanged snake in the family Atractaspididae. It is endemic to Africa.
Polemon neuwiedi, called commonly the Ivory Coast snake-eater or Neuwied's polemon, is a species of venomous rear-fanged snake in the family Atractaspididae. The species is endemic to West Africa.
Polemon notatus is a species of venomous rear-fanged snake in the family Atractaspididae. It is endemic to Africa.
Aparallactus capensis, or the Cape centipede-eater, is a species of venomous rear-fanged snake in the Atractaspididae family.
Aparallactus guentheri, or the black centipede-eater, is a species of venomous rear-fanged snake in the family Atractaspididae. The species is endemic to Africa.
Aparallactus lunulatus, or the reticulated centipede-eater, is a species of venomous rear-fanged snake in the family Atractaspididae, which is endemic to Africa.
Aparallactus nigriceps, or the Mozambique centipede-eater, is a species of venomous rear-fanged snake in the family Atractaspididae.
Aparallactus werneri, or the Usambara centipede-eater, is a species of venomous rear-fanged snake in the family Lamprophiidae. The species is endemic to Tanzania.
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