Hematopoiesis in Three Species of Gastropods Following Infection with Echinostoma paraensei (Trematoda: Echinostomatidae)

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Abstract
Mitotic responses to infection with miracidia of Echinostoma paraensei have been studied histologically in Biomphalaria obstructa, Helisoma trivolvis, and Physa virgata, all of which are incompatible hosts for this trematode. Whereas dividing cells were rare in tissues of non-infected controls, substantial numbers of mitotic figures were counted in most infected snails. In B. obstructa, mitoses were concentrated in the anterior pericardial wall and saccular kidney. In H. trivolvis, most mitoses occurred in the lateral pericardial wall and posterior end of the kidney. Finally, in P. virgata, the pericardial wall was devoid of mitoses, which instead occurred primarily in the mantle and kidney. A variety of cell types were involved in these mitotic responses, including circulating amoebocytes, blast-like cells in the pericardial wall, mesenchymatous cells of the saccular kidney, and in B. obstructa and H. trivolvis, renal epithelial cells.

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