Collared iguana (Oplurus cuvieri)

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Collared iguana on branch
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Collared iguana fact file

Collared iguana description

KingdomAnimalia
PhylumChordata
ClassReptilia
OrderSquamata
FamilyOpluridae
GenusOplurus (1)

The collared iguana (Oplurus cuvieri) is the most common lizard species in the western forests of Madagascar and the largest species in the Opluridae family (3). It is named for the distinctive black collar that stands out against the greyish-brown body, which is speckled with lighter spots (2) (4)

This iguana species has a robust, flattened build, with a chunky head and a relatively short tail, which bears spiny whorled scales down its length (2) (4). Female collared iguanas are duller in colour than males (4).

Also known as
Cuvier's Madagascar swift, Madagascan collared iguana.
Synonyms
Tropidurus cuvieri.
Size
Length: 35 cm (2)
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Collared iguana biology

This spiky-tailed iguana is primarily arboreal, or tree-dwelling, and spends much of its time gripping to trunks and branches, where it remains motionless as it scans the surrounding area for prey. When the collared iguana spots an insect, its primary food source, it ambushes it, moving quickly to capture it on a nearby tree surface or running to the ground to attack. Collared iguanas have also been observed positioning themselves near an ant trail where they can gain an easy meal by picking up the ants one by one. Occasionally, the collared iguana may also eat plant matter, such as flowers found on the ground (7).

The collared iguana lays its eggs after the first heavy rain of the rainy season. The female digs a hole, up to around 12 centimetres deep, in open ground where there is no live vegetation, often on a man-made forest trail. Into this hole the female lays a clutch of two to five eggs, with three or four eggs being the most common clutch size.

The female fills the hole with sandy soil and covers the nest with sand, dead leaves and twigs, so that the laying site blends into the surroundings. The female then immediately leaves the nest site. The eggs remain in the nest for 61 to 71 days at a temperature of 29 to 31 degrees Celsius before hatching (8).

Despite the collared iguana’s efforts at disguising the nest, the eggs are still frequently uncovered and eaten by snakes, such as the Malagasy giant hognose snake (Leioheterodon madagascariensis) (8). When threatened by a bird of prey or a predatory snake, the collared iguana will retreat into a crack or crevice in a tree trunk, and use its armoured tail to form a barrier between itself and the predator (4).

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Collared iguana range

The collared iguana occurs in north-western and central Madagascar and on Grande Comore Island. There are two subspecies: Oplurus cuvieri cuvieri is found in north-western and central Madagascar. Oplurus cuvieri comorensis occurs only on Grande Comore Island, westward of the northern coast of Madagascar in the northern Mozambique Channel (5 (6).

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Collared iguana habitat

The collared iguana inhabits tropical forest and rainforest (4).

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Collared iguana status

The collared iguana is classified as Least Concern (LC) on the IUCN Red List (1).

IUCN Red List species status – Least Concern

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Collared iguana threats

The collared iguana has not yet been assessed by the IUCN and therefore it is not clear whether this species is threatened with extinction, and if so, what threats it faces.

However, the forests of Madagascar face a number of threats which may be impacting on this iguana; this includes the burning of forests for the expansion of agricultural lands and the exploitation of trees for timber and charcoal (9).

The Grande Comore population might soon suffer from competition with the recently introduced invasive agamid lizard Agama agama (6).

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Collared iguana conservation

There are no known conservation measures currently in place for the collared iguana.

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

For further information on conservation in Madagascar see:

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Authentication

Authenticated (03/09/11) by Olivier S.G. Pauwels, Research Associate at the Royal Belgian Institute for Natural Sciences, Brussels, Belgium.
http://www.pauwelsolivier.com/

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Glossary

Subspecies
A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.
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References

  1. IUCN Red List (April, 2012)
    http://www.iucnredlist.org/
  2. Bosch, H. and Werning, H. (1991) Green Iguanas and other Iguanids. TFH Publications, New Jersey.
  3. Randriamahazo, H.J.A.R. (1998) Activity temperature in Oplurus cyclurus, Oplurus cuvieri and Zonosaurus laticaudatus and resting metabolic rates in the latter two species. Amphibia-Reptilia, 19: 215 - 220.
  4. Burnie, D. (2001) Animal. Dorling Kindersley, London.
  5. Burghardt, G.M. and Rand, A.S. (1982) Iguanas of the World: Their Behavior, Ecology, and Conservation. Noyes Publications, Park Ridge, New Jersey.
  6. Münchenberg, T., Wollenberg, K.C., Glaw, F. And Vences, M. (2008) Molecular phylogeny and geographic variation of Malagasy iguanas (Oplurus and Chalarodon). Amphibia-Reptilia, 29: 319-327.
  7. Mori, A. and Randriamahazo, H.J.A.R. (2002) Foraging mode of a Madagascan iguanian lizard, Oplurus cuvieri cuvieri. African Journal of Ecology, 40(1): 61 - 64.
  8. Randriamahazo, H.J.A.R. and Mori, A. (2001) Egg-Laying Activities and Reproductive Traits in Females of Oplurus cuvieri cuvieri. Journal of Herpetology, 35(2): 209 - 217.
  9. The Encyclopedia of Earth (March, 2008)
    http://www.eoearth.org/article/Madagascar_succulent_woodlands
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Image credit

Collared iguana on branch  
Collared iguana on branch

© Nick Garbutt / www.photoshot.com

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