Polemon gabonensis

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Subordo: Serpentes
Infraordo: Caenophidia
Superfamilia: Elapoidea

Familia: Atractaspididae
Subfamilia: Aparallactinae
Genus: Polemon
Species: Polemon gabonensis
Subspecies (2): P. g. gabonensis – P. g. schmidti
Name

Polemon gabonensis (Duméril, 1856)

Holotype: MNHN.

Type locality: “Gabon”.
Combinations

Elapomorphus gabonensis Duméril, 1856: 468 [original combination]
Miodon gabonensis — Boulenger, 1896: 252 [subsequent combination]

References
Primary references

Duméril, A.H.A. 1856. Note sur les reptiles du Gabon. Revue et Magasin de Zoologie Pure et Appliquée Series 2, 8: 369–377, 417–424, 460–470, 553–562. BHL

Links

Uetz, P. & Hallermann, J. 2022. Polemon gabonensis. The Reptile Database. Accessed on 28 June 2019.

Vernacular names
English: Gaboon Snake-eater

Polemon gabonensis, or the Gaboon snake-eater, is a species of venomous rear-fanged snake in the family Atractaspididae.[3] It is endemic to Africa.[4]

Geographic range

It is found in Benin, Cameroon, Central African Republic, Democratic Republic of the Congo, Nigeria, and Togo.[5]
Description

Dorsally dark brown or olive, with three darker stripes, or all blackish. Upper lip white. A pale brownish band across the occiput. Ventrals, subcaudals, and terminal caudal scute white.

Adults may attain a total length of 51 cm (20 inches), with a tail 23 mm (⅞ inch) long.

Dorsal scales smooth, without apical pits, arranged in 15 rows. Ventrals 214-249; anal plate divided; subcaudals 16-24, also divided (in two rows).

Diameter of eye ⅓ to ½ its distance from the mouth. Rostral broader than high, barely visible from above. Internasals as long as or slightly shorter than the prefrontals. Frontal slightly broader than the supraocular, 1⅓ to 1½ times as long as broad, as long as its distance from the rostral, much shorter than the parietals. Nasal entire or imperfectly divided. One preocular, in contact with the nasal. One or two postoculars. Temporals 1+1. Seven upper labials, third and fourth entering the eye. First lower labial forming a suture with its fellow behind the mental. Four lower labials in contact with the anterior chin shield. Two pairs of chin shields, the anterior pair longer than the posterior pair.[6]
Subspecies

Two subspecies are recognized including the nominate race.

Polemon gabonensis gabonensis (A.H.A. Duméril, 1856)
Polemon gabonensis schmidti (de Witte & Laurent, 1947)[7]

Etymology

The subspecific name, schmidti, is in honor of American herpetologist Karl Patterson Schmidt.
Footnotes

Boulenger, G.A. 1896. Catalogue of the Snakes in the British Museum (Natural History), Volume III. Trustees of the British Museum. London. p. 252.
The Reptile Database. www.reptile-database.org.
"Polemon". Integrated Taxonomic Information System. Retrieved 5 September 2007.
Polemon at the Reptarium.cz Reptile Database. Accessed 5 May 2009.
The Reptile Database. www.reptile-database.org.
Boulenger, G.A. 1896. Catalogue of the Snakes in the British Museum (Natural History), Volume III. Trustees of the British Museum. London. pp. 249-250, 252.

The Reptile Database. www.reptile-database.org.

References

Duméril, A.H.A. 1856. Note sur les reptiles du Gabon. Revue et Magasin de Zoologie Pure et Appliquée (2) 8: 369-377, 417-424, 460-470, 553-562. (Elapomorphus gabonensis, p. 468.)
de Witte, G.F. & R.F. Laurent. 1947. Revision d'un groupe de Colubridae africains: genres Calamelaps, Miodon, Aparallactus, et formes affines. Mém. Mus. Roy. Hist. Nat. Belgique (sér. 2) 29: 1-134.