Abstract
A tetracotyliform metacercaria was found in the musculature of the brook stickleback (Eucalia inconstans). It is characterized by a tail‐like appendage on the cyst. The adult was reared in newly hatched chicks, and proved to be Apatemon gracilis pellucidus (Yamaguti, 1933). Attempts to infect snails, Physa, Stagnicola and Helisoma, were unsuccessful.

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