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Telescopus

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Telescopus
T. semiannulatus in an acacia, central Tanzania
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Subfamily: Colubrinae
Genus: Telescopus
Wagler, 1830
Type species
T. fallax
Synonyms
  • Tarbophis Fleischmann, 1831

Telescopus, the Old World catsnakes, is a genus of 12 species of mildly venomous opisthoglyphous snakes in the family Colubridae.

Geographic range

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Species of the genus Telescopus are found from the Balkans and Pakistan through to southern and western Africa, plus two species in northern Eurasia.

Description

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The genus Telescopus is characterised by having a slender slightly flattened cylindrical body and attaining a total length (including tail) of between 80–180 cm (about 2.5–6 feet). They have medium-large eyes with vertical pupils, a typical feature of nocturnal reptiles, and have smooth dorsal scales. The dentition of the genus is as follows; typically 10–12 maxillary teeth, with a space before a pair of grooved fangs at the rear of the mouth, approximately level with the eyes. The anterior mandibular teeth are usually longer than the posterior mandibular teeth, perhaps to aid the arboreal species in catching and holding prey whilst in trees. The species are mostly drab, spotted snakes, but include the spectacular tiger snake (T. semiannulatus), which is orange in color with black saddles along its back.[1]

Habitat and Behaviour

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The genus Telescopus includes both arboreal and terrestrial species, and can be found from sea level up to 2,000 metres (about 6,600 feet) above sea level. They are nocturnal hunting snakes with a distinct head and large eyes.

Diet

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The primary prey species of Telescopus are small lizards, including geckos, although some members of the genus may occasionally prey on small birds, rodents and amphibians.

Reproduction

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All species in the genus Telescopus are oviparous, laying clutches of 5–15 eggs.

Venom

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All species in the genus Telescopus are venomous, with the venom being of a neurotoxic nature; however, they are not considered particularly harmful to man. This is because the opisthoglyphous venom-delivery system is not as efficient as the delivery systems found in Elapidae and Viperidae. However, some members of the genus Telescopus such as T. dhara have particularly large venom glands, and the venom toxicity in some species has been compared to that of the Acanthophis species. For these reasons, it is advisable that all Telescopus species be handled with caution. It is also important to consider that allergic reactions are possible after a bite, and such reactions would significantly worsen the effects of an envenomation.

Species

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Telescopus beetzi – Beetz's tiger snake, also known as the Namib tiger snake

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Telescopus.

References

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  1. ^ Boulenger GA (1896). Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the Colubridæ (Opisthoglyphæ and Proteroglyphæ), .... London: Trustees of the British Museum. (Taylor and Francis, printers). xiv + 727 pp. + Plates I- XXV. (Genus Tarbophis, p. 47).

Further reading

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  • Wagler J (1830). Natürliches System der Amphibien, mit vorangehender Classification des Säugthiere und Vögel. Ein Beitrag zur vergleichenden Zoologie. Munich, Stuttgart, and Tübingen: J.G. Cotta. vi + 354 pp. + 1 plate. (Genus Telescopus, p. 182). (in German and Latin).
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