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Isthmohyla rivularis


Latin Name: Isthmohyla rivularis (meaning ‘of a stream’)

Location: Monteverde, Costa Rica

Size: 34mm (males), 37 mm (females)

Status: Critically Endangered: http://www.iucnredlist.org/details/55627)

This small nocturnal tree frog lives along fast flowing streams in remote areas of the Monteverde Cloud Forest in Costa Rica. Active at night, the males call from the shelter of vegatation along the edge of the streams. Females come to the streams to spawn. The spawn of this frog has yet to be described. The species was once abundant at the Cloud Forest. However, in the 1980’s the population crashed and the species disappeared without trace along with the iconic Golden Toad, Bufo pereglines. Until recently, the species was thought to have become extinct.

Redescovering an extinct frog: http://www.wildlifeextra.com/go/news/extinct-frog935.html

Manchester Unilife feature: http://www.staffnet.manchester.ac.uk/medialibrary/unilife/vol5-issue1.pdf:

Picture 292In 2007 a single male specimen was re-discovered in a dense tropical valley within the Monteverde Reserve. A year later an expedition was launched to try and find out if a viable population of this rare frog still existed. Further males were discovered and a single female full of eggs. Since the re-discovery, several other specimens have been located, but it is clear that the future for the very fragile population hangs precariously in the balance.


Video of finding a male Isthmohyla rivularis click here: http://news.bbc.co.uk/1/hi/sci/tech/7609588.stm

Video of finding the female Isthmohyla rivularis click here: http://news.bbc.co.uk/1/hi/sci/tech/7609780.stm

Tadpole of Isthmohyla rivularis

Tadpole of Isthmohyla rivularis

The tadpoles of Isthmohyla rivularis are brown and gold and have large mouths which allow them to hold onto rocks to stop them being washed away in the fast-flowing streams where they develop.