Comprehensive DescriptionRead full entry
Description of CanningiaThe type species is C. spinidentis Weiser, Wegensteiner and Zizka, 1995 in tissues µmainly fat body and malphigian tubules) of larvae and adults of fir bark beetle, Pityokteines spinidens (Coleoptera, Scolytidae). Monomorphic, monokaryotic throughout the life cycle. Meiosis uncertain, probably absent. Transmission transovarial and by ingestion of spores. Merogony: broadly oval cells, 3-5 µm in size, uninucleate. No plurinucleate forms known. Sporogony: sporonts are single, uninucleate cells in direct contact with host cell cytoplasm, bearing a thin layer of future exospore material. Spores, 1.9 - 2.0 x 0.8 - 1.0 µm, elongate oval to tubular, sometimes slightly curved, uninucleate. Polaroplast bipartite, anterior part of thinner, flat lamellar sacs, posterior part of shorter, broader lamellar sacs Polar tube isofilar with 5 -7 coils in a single rank. The anchoring disc of the filament is globular, situated subapically and bulging into an indentation of the spore wall.