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Prötzel, Lambert, Andrianasolo, Hutter, Cobb, Scherz and Glaw, 2018
This recently described chameleon species is only known from a small strip of rainforest near Vohidrazana in central eastern Madagascar. The small forest area belongs to the rainforest corridor of Ankeniheny-Zahamena and is unfortunately very threatened by deforestation and slash-and-burn despite protection efforts. Vohidrazana is a bit remote and it takes a few hours to walk uphill on narrow paths to get there from the route nationale 2 from direction Andasibe. Accordingly, the forest is rarely visited by travellers.
Look and size:
The main characteristic of the species is its size: With a total length of only 9.4 cm from the tip of the nose to the tip of the tail Calumma roaloko is the smallest chameleon of the genus Calumma. The optically divided scaling is just as striking: In males, the upper half of the body is bright green, the lower half greyish-white to beige. The Malagasy name roaloko describes this phenomenon exactly: roaloko is Malagasy for “two colors”. The females of the species are also two-coloured but in muted brown and beige tones. The nose of the females can be yellow.
In both sexes, a white stripe runs along the entire upper lip to the small occipital lobes, which connect to the flat helmet and show a small indentation in the middle. Both also have a dark stripe running across the eyelids and a flexible, soft nasal projection. It is slightly more pronounced in males than in females. The dorsal crest is reduced to a maximum of two small conical scales in the front area, not present at all in many individuals.
Good to know:
The species was previously classified as Calumma nasutum. As has been known for some years, a whole series of partly undescribed species from the smallest areas of Madagascar hide under this species name.
We have collected the data given above over several years with thermometers and hygrometers at the finding places of the chameleons. "Average temperature" means that values of a whole month have been calculated to one average value per month. For example all measured minimum temperature values of February have been calculated to one average minimum temperature for February. In plain language, this means single peak values of a day may be a little higher or lower than the average minimum and maximum temperatures. It is possible that a location has an average maximum temperature of 29°C, but one day during that month it had 33°C or even 35°C there.
The region around Andasibe with the belonging forests Mantadia and Analamazaotra is located in Madagascar's eastern highlands at elevations between 900 and 1250 m above sea level. Thus temperatures sometimes reach temperatures above 25°C, but thermometers rarely climbs above 30°C or only in sunny places. At night, temperatures always drop to 10° to 15°C.
Humidity in Andasibe's rainforest is high all year long. During rainy season, it rains intensively every day, sometimes rain even lasts for days. But also dry season does not differ much besides the fact of cooler temperatures. It still rains at least every other day, in most years more often. Rain, humidity and temperature drop at night are the key features of the region around Andasibe.
We have measured UVB data with a Solarmeter 6.5 in spring (March, April) at the peak of activity of chameleons in Madagascar. We always measured the values that a chameleon could maximally reach in its habitat.
The following photos show parts of the habitat of Calumma roaloko in the region around Vohidrazana. The species prefers very shrubby bushes and very dense, mossy branches. Probably the animals are more difficult for predators to catch due to their size and agility in such dense habitats.
In the following you will find some 360° pictures from the region around Vohidrazana. With the mouse, you can rotate in all directions. If you click on the Theta logo, the images will open in an enlarged view in a separate window. There is also the possibility to execute the pictures in full-screen mode. Have fun watching!
Regenwald im Schutzgebiet Maromizaha, Region Alaotra-Mangoro, östliches Hochland, Madagaskar, April 2018 – Spherical Image – RICOH THETA