Microsporidia
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Microsporidia are a group of spore-forming parasitic unicellular fungi. These spores contain an extrusion apparatus that has a coiled polar tube ending in an anchoring disc at the apical part of the s
Xenoma on flatfish caused by Glugea stephani
Dictyocoela diporeiae. A, meront and spore; B, spore wall; C, polar filament
A hyperparasitic microsporidian, Nosema podocotyloidis, a parasite of a digenean which is itself a parasite of a fish.
Protozoa
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Protozoa are a polyphyletic group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic debris. Historically, protozoans wer
Clockwise from top left: Blepharisma japonicum, a ciliate; Giardia muris, a parasitic flagellate; Centropyxis aculeata, a testate (shelled) amoeba; Peridinium willei, a dinoflagellate; Chaos carolinense, a naked amoebozoan; Desmarella moniliformis, a choanoflagellate
Class Protozoa, order Infusoria, family Monades by Georg August Goldfuss, c. 1844
John Hogg's illustration of the Four Kingdoms of Nature, showing "Primigenal" as a greenish haze at the base of the Animals and Plants, 1860
Frederick Chapman's The foraminifera: an introduction to the study of the protozoa (1902)