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The Ascetosporea are a group of that are of animals, especially marine . The two groups, the haplosporids and paramyxids, are not particularly similar morphologically, but consistently group together on molecular trees, which place them near the base of the Cercozoa. Both produce without the complex structures found in similar groups (such as polar filaments or tubules).
Haplosporid spores have a single cell nucleus and an opening at one end, covered with an internal diaphragm or a distinctive hinged lid. After emerging, it develops within the cells of its host, usually a marine Mollusca or annelid, although some infect other groups or freshwater species. The trophic cell is generally . Paramyxids develop within the digestive system of marine invertebrates, and undergo internal budding to produce multicellular spores.
A 2009 study concluded that Haplosporidium species form a paraphyletic group and that the taxonomy of the haplosporidians needs a thorough revision.
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