Mark Welch, David B. Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biological Laboratory, Woods Hole, Massachusetts.
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A group of little-known marine animals belonging to the phylum Rotifera. Seisonidea is currently classified as the only family within the order Seisonacea and the class Pararotatoria. However, the relationship between Seisonidea and other rotifer groups and allied taxa (including Bdelloidea, Monogononta, Acanthocephala, Gnathostomulida, and Micrognathozoa) is obscure, and advances in molecular phylogenetics, particularly phylogenomics, are likely to revise the present understanding of the evolution of this enigmatic group. There are three described species: Paraseison annulatus and Seison nebaliae, both recorded from the Mediterranean Sea and the Atlantic coast of Europe; and S. africanus, known only from a small number of preserved specimens collected off the coast of Kenya in the Indian Ocean. Seisonids also have been found in the Southern (Antarctic) Ocean and off the coast of California, but these have not yet been identified or formally described. See also: Rotifera
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