Isthmohyla calypsa

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Isthmohyla calypsa is a critically endangered frog, possibly extinct, in the Hylidae family. It lives in humid, lower mountain forests along fast streams at about 1,500 to 2,100 meters above sea level in southern Costa Rica and Panama. It appears to be gone from Costa Rica, and its status in Panama is unclear but likely declined. When it was described in 1996, it was confused with Isthmohyla lancasteri, a related species found at lower elevations. Adults are small: males about 36 mm and females about 41 mm long from snout to vent. The back is metallic green with darker green or brown blotches and has large, spiny bumps; the limbs are also spiny. The belly is white with scattered black spots, and the groin and thighs are bright white with black spots. The frogs live in primary humid forests along torrential streams. Threats include chytridiomycosis (a fungus) and habitat loss from smallholder livestock farming. It has been recorded in La Amistad International Park and might occur in Volcán Barú National Park.