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Thyroxin-Induced Metamorphosis of the Neotenic Salamanders Eurycea tynerensis and Eurycea neotenes

1952; American Society of Ichthyologists and Herpetologists; Volume: 1952; Issue: 4 Linguagem: Inglês

10.2307/1439269

1938-5110

James Kezer,

Venomous Animal Envenomation and Studies

and the pattern of their distribution suggest that they have evolved from a common form, each becoming modified during an unknown period of isolation. Comparison of the intestinal contents of the specimens of Graptemys barbouri and G. pulchra from the Escambia River suggests that they may be different in their food preferences. The intestine of barbouri contained snail shells almost exclusively; that of pulchra almost exclusively clam shells. Research in progress on the structure of the skulls and the ecology of these turtles promises to furnish material essential to an interpretation of their origin and evolution. The ranges are inadequately defined. Workers in Alabama and Georgia can contribute much needed information by collecting turtles of these species.