Abstract
Ultrastructural investigation of the microsporidium, Nosema cuneatum, (Microspora: Nosematidae), a parasite infecting Melanoplus sanguinipes (Orthoptera: Acrididae). Stages in merogony and sporogony are apansporoblastic, occur in a diplocaryon arrangement and undergo binary fission. Nuclei are connected during karyokinesis in a dumbbell-like arrangement. Microtubules within the nucleus are either associated with the kinetochore or extend from spindle plaque to spindle plaque. Merogony stages in the host cytoplasm are surrounded by an intermittent layer. During sporogony, an electron-dense layer is deposited along the parasite plasmalemma. The spore is binucleate and the polar tube is isofilar, with between 10 to 12 polar tube coils in cross-section.
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