Ascetosporea

The Ascetosporea are a group of protists that are parasites of animals, especially marine invertebrates. There are two groups, the haplosporids and paramyxids, which are not particularly similar morphologically but consistently group together on molecular trees, which place them near the base of the Cercozoa.^[1] Both produce spores without the complex structures found in similar groups (such as polar filaments or tubules).

Haplosporid spores have a single 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 mollusc or annelid, although some infect other groups or freshwater species. The trophic cell is generally multinucleate. Paramyxids develop within the digestive system of marine invertebrates, and undergo internal budding to produce multicellular spores.

References

1. ^ Cavalier-Smith, T; Chao, Ee (May 2003), "Phylogeny of choanozoa, apusozoa, and other protozoa and early eukaryote megaevolution", Journal of molecular evolution 56 (5): 540–63, doi:10.1007/s00239-002-2424-z, PMID 12698292 

This protist-related article is a stub. You can help Wikipedia by expanding it.

This article related to parasites or parasitology is a stub. You can help Wikipedia by expanding it.