Abstract
Thelohania butleri n. sp. was found in cells of skeletal muscles of the shrimp Pandalus jordani, from Queen Charlotte Sound, British Columbia, Canada. Sporulation stages were studied with the light and the electron microscope. Earliest stages were small and apparently uninucleate. Next were small diplokaryotic cells that possibly arose by fusion of the former. These enlarged and underwent sporogony. Sporogony was a series of three binary divisions, each producing unikaryotic cells. There was no sporogonial plasmodium. The spore was ovoid, 4.8 × 3.1 μm (stained), with a large crescentic nucleus and rounded posterior vacuole. The polar filament was isofilar, doubly coiled, with about 10 turns. This species closely resembles the type T. giardi Henneguy. It is concluded that sporogony by means of three binary divisions and lack of a sporogonial plasmodium may be essential characters of the genus Thelohania Henneguy, 1982.
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