. The biology of the amphibia. Amphibians. A B Fig. 33.—Burrowing toads. Fossorial toads of several different families resemble one another in their narrow, pointed heads and conspicuous 'spades,' the digging tubercles of the hind feet. A. Hemisus marmoratum, a brevicipitid. B. Rhinophrynus dorsalis, a The integument, which is the tissue first to come into contact with the environment, might be expected to show the greatest number of adaptations. But Protopipa and Pipa from the ponds of Guiana have a very different degree of skin rug- osity. Hyla vasta and Eleu- therodactylus inoptat
. The biology of the amphibia. Amphibians. A B Fig. 33.—Burrowing toads. Fossorial toads of several different families resemble one another in their narrow, pointed heads and conspicuous 'spades,' the digging tubercles of the hind feet. A. Hemisus marmoratum, a brevicipitid. B. Rhinophrynus dorsalis, a The integument, which is the tissue first to come into contact with the environment, might be expected to show the greatest number of adaptations. But Protopipa and Pipa from the ponds of Guiana have a very different degree of skin rug- osity. Hyla vasta and Eleu- therodactylus inoptatus live in the tall trees of Hispaniola and yet the first has a rough and the second a smooth skin. Smooth-skinned toads such as Bufo alvarius of Arizona live only near water, while rough-skinned species may be found far from water in the desert. Thus, the structure of the integument apparently restricts the range of the spe- cies, but the correlation be- tween skin structure and environment is not always close. Many Salientia (Figs. 33 and 34) burrow to avoid desiccation. The Spade-foot Toads are equipped with large metatarsal tubercles which are doubtless of great assistance in this. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Noble, Gladwyn Kingsley, 1894-1940. New York : McGraw-Hill
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Keywords: ., bookcentury1900, bookpublishernewyorkmcgr, booksubjectamphibians
