SYNOPSIS. Seven monoxenous Trypanosomatidae, Crithidia fasciculata (Anopheles strain), C. fasciculata (Culex pipiens, Wallace), C. fasciculata (Culex pipiens, Nöller), C. luciliae, C. sp. from Euryophthalmus, “Strigomonas” oncopelti and Blastocrithidia culicis all are catalase‐positive. S. oncopelti is only catalase‐positive when grown in hemin‐media. When grown at elevated temperature, C. fasciculata (Anopheles), C. luciliae and S. oncopelti have greater and C. fasciculata (Culex pipiens, Wallace) reduced catalase activity. C. fasciculata (Culex pipiens, Nöller) and C. sp. from Euryophthalmus show reduced catalase activity at elevated temperature that is of borderline significance. Catalase as a phylogenetic marker is discussed.
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WERTLIEB et al. (1963) studied this question.
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