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A Comparison of the Gill-Arch System and Fins of Three Genera of Larval Salamanders, Rhyacotriton, Gyrinophilus, and Ambystoma

Barry D. Valentine and David M. Dennis
Copeia
Vol. 1964, No. 1 (Mar. 26, 1964), pp. 196-201
DOI: 10.2307/1440850
Stable URL: http://www.jstor.org/stable/1440850
Page Count: 6
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A Comparison of the Gill-Arch System and Fins of Three Genera of Larval Salamanders, Rhyacotriton, Gyrinophilus, and Ambystoma
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Abstract

Larvae of Rhyacotriton, Gyrinophilus, and Ambystoma are representative of groups of salamanders inhabiting, respectively, mountain brooks, stream, and ponds. Mountain brook dwellers differ from stream and pond dwellers by their modified and reduced gill rami, the loss of the second row of gill fimbriae, the heavy gular fold, and the restriction of the fins posterior to the vent. Stream dwellers differ from pond dwellers by their shorter, heavier gills, reduced gill rakers, less biconvex gular fold, more depressed body, more extensive fins, absence of balancers, etc. The distinction betwean highly specialized mountain brook species and stream species has not been recognized previously.

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