Goin, 1970) "Centrolene" petrophilum Ruiz-Carranza and Lynch, 1991 "Centrolene" quindianum Ruiz-Carranza and Lynch, 1995 "Centrolene" robledoi Ruiz-Carranza and Lynch, 1995 "Cochranella" duidaeana (Ayarzagüena, 1992) "Cochranella" euhystrix (Cadle and McDiarmid, 1990) "Cochranella" geijskesi (Goin, 1966) "Cochranella" megista (Rivero, 1985) "Cochranella" ramirezi Ruiz-Carranza and Lynch, 1991 "Cochranella" riveroi (Ayarzagüena, 1992) "Cochranella" xanthocheridia Ruiz-Carranza and Lynch, 1995 Subfamily Hyalinobatrachinae Genus Celsiella Guayasamin, Castroviejo, Trueb, Ayarzagüena, Rada, Vilá, 2009 Genus Hyalinobatrachium Ruiz-Carranza & Lynch, 1991 – "True" Glass Frogs Subfamily incertae sedis Ikakogi Guayasamin, Castroviejo, Trueb, Ayarzagüena, Rada, Vilá, 2009 Camouflage The evolutionary advantage of a partly clear skin and an opaque back was a mystery, as it did not seem to be effective as camouflage. It was found that the colour of the frog's body changed little against darker or lighter foliage, but the legs were more translucent and consequently changed in brightness. By resting with the translucent legs surrounding the body, the frog's edge appears softer, with less brightness gradient from the leaf to the legs and from the legs to the body, making the outline less noticeable. This camouflage phenomenon, in which the frog's edges are softened to match the relative brightness of its surroundings, is referred to as edge diffusion. Experiments with computer-generated images and gelatine models of opaque and translucent frogs found that the translucent frogs were less visible, and were attacked by birds significantly less often. It was found in 2022 that these frogs have the ability to conceal red blood cells concentrated inside their livers, increasing transparency when they are vulnerable. While this would cause massive clotting in most animals (including humans), glass frogs are able regulate the location, density, and packing of red cells without clotting. The findings could advance medical understanding of dangerous blood clotting. Characteristics Glass frogs are generally small, ranging from in length. They appear light green in color over most of their bodies, except for the skin along the lower surface of the body and legs, which are transparent or translucent. The glass frog's transparent skin allows an external view of the viscera—the internal organs present in the body's main cavity—making it so observers can witness the frog's internal processes, such as the heart beating and pumping blood through its arteries. Patterning of glass frogs is varied amongst different species, while some appear as a uniform green color, others display spots that range from yellow to white, mimicking the coloration of their