SUMMARY. Altered tracheal gills were found on some specimens of Phasganophora capitata (Plecoptera: Perlidae) and net‐spinning caddisflies (Trichoptera: Hydropsychidae) collected from streams in New York State. At one location only the basal portion remained of the normally highly‐branched structures. At another location the gills were impregnated with a tar‐like substance. Chlorine and crude oil are the suspected causal agents.
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Karl W. Simpson (1980) studied this question.
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