All life cycle stages have isolated nuclei. The sporogony yields 4-16, most frequently 12, sporoblasts. A fragile sporophorous vesicle is formed by the sporont.
Spores are lightly pyriform, with both poles blunt, often with one surface slightly convex.
The host is the cladoceran Daphnia magna . The primary site of infection is the fat body, but infection was also observed in the hypodermic cells and the ovaries. Transversely sectioned polyribosomes appeared as characteristic circular configurations of 9 ribosomes. Teratological development, including incomplete separation of sporoblasts, macrospores with supernumerary polar filament coils, and disturbed coiling, was observed. The identification of the species and the genus position are briefly discussed.