Abstract
Eastern red-spotted newts ( Notophthalmus viridescens , Salamandridae) are rarely attacked by leeches. This protection is not shared by related salamandrids or by Ambystoma (Ambystomatidae). Tetrodotoxin is not the repellent. The immunity of Notophthalmus to leech parasitism is probably most significant in its aquatic stages, although the terrestrial efts are also protected.