Comprehensive Description

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Description of Alloglugea

The type species is A. bufonis Paperna and Lainson, 1995 in Bufo marinus (Amphibia, Anura). It develops in single or aggregated xenomas, each up to 250 µm diameter in the lamina propria of the intestine. The enlarged host cells are bordered by a thin plasma membrane overlain by fibroblasts and the parasites develop at the periphery around a central hypertrophic host cell nucleus. Monomorphic, monokaryotic throughout life cycle. Meiosis unknown. Transmission probably by ingestion of spores or cannibalism by tadpoles. Merogony: multinucleate stout plasmodia with diffuse nuclei differentiate into elongate forms with compact nuclei. Sporogony: ribbon-like plasmodia with a single or double row of compact nuclei fragment into sporoblasts, possibly via binucleate segments. No sporophorous vesicles. Spores: 1.3-1.6 x 0.6-0.8 µm (fixed), ovoid but with anterior end depressed over polar sac. Polaroplast vesicular. Polar tube isofilar with about 5-6 coils and whorled membranes (posterosome?) terminally. Cytoplasm invaginated into the region of whorled membranes. Spores released from xenomas are phagocytised by macrophages, which persist in spleen and liver in newly metamorphosed toads but infection is gradually lost in adults.

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