Abstract Kabataia gen. Based on a fine structural study, a new genus, Kabataia gen. It develops in trunk muscles of a South-East Asian freshwater fish, Pangasius sutchi . Sporoblasts and early spores are characterized by a dense globule at the site of the posterior vacuole.
Mature spores are of a rather variable shape.
Their exospore is raised into small, irregular fields. The polaroplast is relatively small and its posterior part consists of flat vesicles with dense contents. Kabataia inflicts heavy damage on muscle tissue. The sarcoplasm within which Kabataia develops is reduced to an amorphous mass with tubule-like fibrils, microfibrils and small vesicles.