Abstract

Three cell types were present in Armadillidium vulgare hemolymph. Hyaline cells, 8.2 to 12.0 μm in size with a few fine granules in the cytoplasm, comprised 42% of the cells. Twelve percent of the cells were nonexplosive granulocytes, 8.8 to 15.0 μm, with many cytoplasmic granules of medium size. A third cell type, an explosive 7.2- to 12.0-μm granulocyte with coarse cytoplasmic granules, comprised 46% of the cells. Within 48 hr after adult specimens of A. vulgare were fed eggs of the acanthocephalan, Plagiorhynchus cylindraceus, isopod hemocytes aggregated in the intestinal epithelium surrounding penetrating acanthors. Encapsulation and death of the parasite routinely followed. No significant difference in hematocrit values or in differential hemocyte counts occurred between infected and uninfected control isopods.

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