Abstract
Abstract Among amphibia tetrodotoxin was found by bioassay only in the family Salamandridae. It was present in substantial concentration (mean value of about 25 μg per g) only in the genus Taricha: T. torosa, T. rivularis, T. granulosa; smaller amounts (1–4 μg per g) were found in Notophthalmus viridescens, Cynops pyrrhogaster, C. ensicauda and trace amounts (less than 0·1 μg per g) in Triturus vulgaris, T. cristatus, T. alpestris, T. marmoratus. This toxin was not detected in fourteen species of the orders Caudata and Salientia. In adult Taricha torosa, tetrodotoxin is concentrated in the skin, ovaries and ova, muscle and blood and is present in trace amounts in the liver, viscera and testes
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