. The biology of the amphibia. Amphibians. SEX AND SECONDARY SEX CHARACTERS 123 it has recently been shown that the males of some and possibly all species of Eurycea hypertrophy the teeth in both jaws from short bicuspid teeth, characteristic of most metamorphosed Amphibia, to elongate monocuspid ones (Fig. 45). It had Sph. Fig. 45.—Secondary sex differences in the skull, especially in the teeth, of the two-lined salamander Eurycea bislineata bislineata. A. Female. B. Male. Devi,., dentary; Fr., frontal; Mx., maxillary; Na., nasal; Op., operculum; Par., parietal; Per., periotic; Pm
. The biology of the amphibia. Amphibians. SEX AND SECONDARY SEX CHARACTERS 123 it has recently been shown that the males of some and possibly all species of Eurycea hypertrophy the teeth in both jaws from short bicuspid teeth, characteristic of most metamorphosed Amphibia, to elongate monocuspid ones (Fig. 45). It had Sph. Fig. 45.—Secondary sex differences in the skull, especially in the teeth, of the two-lined salamander Eurycea bislineata bislineata. A. Female. B. Male. Devi,., dentary; Fr., frontal; Mx., maxillary; Na., nasal; Op., operculum; Par., parietal; Per., periotic; Pmx., premaxillary; , prearticular; , pre- frontal; Pt., pterygoid vestige; Qu., quadrate; Sept., septomaxilla; Sph., sphe- nethmoid; Sq. squamosal. previously been pointed out that the males of most plethodontids have the premaxillary teeth elongate, monocuspid, and directed more or less forward (Fig. 46). A possible use for the latter modification was found in courtship of Eurycea bislineata (Noble, 1929) where during the initial stage the male rubs the female. 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
