. The biology of the amphibia. Amphibians. 122 THE BIOLOGY OF THE AMPHIBIA and D. fuscus carolinensis, the male exhibits an increasing ten- dency to lose its vomerine teeth in adult life and to reduce the anterior part of the parasphenoid tooth patches. Leurognathus marmorata intermedia, which has been derived from D. quadra-. Fig. 44.—The reappearance of male characters in both sexes of other species. The nuptial spines, usually characteristic of the male frog, occur in the female Crossodactylus gaudichaudii {A) nearly as well developed as in the male (B). The vomerine teeth are lacking in th
. The biology of the amphibia. Amphibians. 122 THE BIOLOGY OF THE AMPHIBIA and D. fuscus carolinensis, the male exhibits an increasing ten- dency to lose its vomerine teeth in adult life and to reduce the anterior part of the parasphenoid tooth patches. Leurognathus marmorata intermedia, which has been derived from D. quadra-. Fig. 44.—The reappearance of male characters in both sexes of other species. The nuptial spines, usually characteristic of the male frog, occur in the female Crossodactylus gaudichaudii {A) nearly as well developed as in the male (B). The vomerine teeth are lacking in the male Desmognathus fuscus (D) but present in the female (E). In the related Leurognathus marmorata marmorata (C) both sexes lack vomerine teeth. The skulls are viewed ventrally, the forelimbs dorsally. Pt., parasphenoid teeth patches; Vt., vomerine teeth. maculatus, has the vomerine teeth absent in the males like the more advanced species of Desmognathus. In L. m. marmorata this loss occurs in both sexes and is called a "specific character" (Fig. 44). The loss might be considered an adaptation to aquatic life except that the terrestrial D. /. carolinensis and the aquatic L. m. intermedia both show the initial stage in tooth loss. Again,. 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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