Physiological Characterizations of Acanthamoeba Strains

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Abstract
Thirty‐seven strains of Acanthamoeba are described using 69 physiological characters. The characterizations of the strains are based on quantitative estimates of growth responses which were standardized to eliminate any effects of differences in growth rates of the strains. Thirty‐six distinct patterns are generated using numerical profiles, but it is possible to distinguish within this total diversity 20 sub‐generic groups which, although not completely congruent with the morphological species, are consistent with other non‐morphological characters. Evidence is presented that Acanthamoeba is a coherent, well‐founded genus, but it is not desirable to recognize formal taxa at the sub‐generic level.