Haplosporidium
''Haplosporidium'' is a genus under order Haplosporida. WoRMS (2021). Haplosporidium Lühe, 1900. Accessed at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=391857 on 2021-12-28 They are a group of eukaryotes that are parasites of marine invertebrates, causing multiple disease which has high mortality to its host, including the notorious disease MSX, which caused massive oyster mortalities in Delaware Bay in 1957 and two years later in Chesapeake Bay. There are four genus under order haplosporida, according to thHand book of the Protists(2017) The principal characteristics of this genus are spores with an apical-hinged operculum and a variety of extensions externally (tails, filaments, extensions, wrapping, folds, and epispore extensions) formed by the same material of the spore wall. The number of ornaments is variable according to the different species. The internal uninucleated endosporoplasm contains a spherulosome (structure formerly designated by the name “sphe ...
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