Table of Contents
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Morphology
Physical Description
Northern glassfrogs derive their common name from the transparent skin covering their bellies, which allows some of their internal organs to be seen. The pulsating heart, covering of the lungs, and other organs can be seen through the skin of the belly of this species. They have white vocal sacs and gold irises, with an exceptionally short snout. The skin of the dorsum is smooth, having a pale lime green color with many tiny, scattered, dark melanophores and small yellow spots. Their limbs are relatively long and slender with no auxiliary membrane. Their digits have well-developed discs that are moderately expanded; their fingers are about one-half webbed and their toes are three-fourths webbed. The tops of their digits and discs are yellow.
Adults reach 22 - 25mm in SVL, males being slightly smaller than females (Campbell, 1998). In males of this family, a distinct hook or bony spine is visible. Located on the upper arm near the shoulders, it is believed that they use this hook as a weapon to defend their territory and perhaps to inflict wounds on other frogs. The hook is absent or internal in females (Badger, 1995; Campbell, 1998).


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