Oligosoma stenotis

Small-eared skink

Oligosoma stenotis
(Patterson & Daugherty, 1994)

Small-eared skink (Stewart Island). <a href="https://www.flickr.com/photos/theylooklikeus">© Jake Osborne</a>
Image attribution
Small-eared skink (Stewart Island). © Jake Osborne
Herpetofaunal category
NZ Skinks
Species complex
Conservation Status
At Risk - Naturally Uncommon
Common names
Small-eared skink

Length: SVL up to 75mm, with the tail being equal to or longer than the body

Weight: up to 6 grams

Description

A strikingly beautiful skink from the alpine regions of Stewart Island.

Small-eared skinks are characterised by a distinctive black mid-dorsal stripe edged by yellow, which runs from the neck to the base of the tail, the presence of a keeled tail, and its relatively small ear openings. Upper surfaces are yellow-brown to green-brown, with the aforementioned mid-dorsal stripe, a brown band bordered by cream or yellow stripes is present on the sides. The lower surfaces range from grey-brown to yellow with some individuals having sparse dark flecking.

Distinguished from co-occurring Oligosoma species by the presence of the keeled tail, small ear openings, and the prominent mid-dorsal stripe.

Life Expectancy

Unknown.

Distribution

Confined to the alpine regions of Stewart Island.

Ecology and Habitat

A diurnal species, occurring in the alpine zone above the treeline, they are often found associated with boulder field, tussock grassland, and herb field habitats. It is possible that as with some other species of small skink that they may utilise invertebrate burrows as retreat sites (pers. comm Tony Jewell).

Social Structure

Solitary.

Breeding Biology

Viviparous. Little is known about the breeding biology; however, birthing is likely to take place in November with up to 2 live young born.

Diet

As with most of our native skinks, this species is omnivorous feeding on both invertebrates (spiders, insects and amphipods), and small fruits.

Disease

Largely unknown.

Conservation status

The major threats for this species come in the form of predation by mammalian pests (rats, mice, possums, and feral cats). Climate change may also be a cause for concern due to their confinement to alpine habitats.

References

van Winkel, D., Baling, M., & Hitchmough, R. (2018). Reptiles and Amphibians of New Zealand: A Field Guide. Auckland University Press, pp376.