The biology of the amphibia (1931) (19761338963)

Title: The biology of the amphibia
Identifier: biologyofamphibi00nobl (find matches)
Year: 1931 (1930s)
Authors: Noble, Gladwyn Kingsley, 1894-1940
Subjects: Amphibians
Publisher: New York : McGraw-Hill
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: York University - University of Toronto Libraries



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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 Pr.Fr. Sph. Fr.
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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; Pr.Art., prearticular; Pr.Fr., 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