Abstract
ABSTRACTIn its amoeboid stage, Protacanthamoeba caledonica n. g., n. sp. closely resembles the genus Acanthamoeba, on both light‐ and electron‐microscopical levels, including possession of a centrosphere with a plaque‐shaped centriole‐like body. The cyst wall differs from that of Acanthamoeba in lack of preformed exit pores and in fine structure; the occasional apparent division into exocyst and endocyst is due to irregular splitting. The strain isolated from a Scottish estuary did not grow at 37°C and did not grow normally on agar made with 25% sea water, but cysts remained viable after a week in full‐strength sea water. Protacanthamoeba n. g. is distinguished from Acanthamoeba on the basis of cyst structure, but it is assigned to the family Acanthamoebidae.
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