Haemohormidium
''Haemohormidium'' is a genus of parasitic alveolates in the phylum Apicomplexia. They have two hosts in their life cycle: the vertebrate hosts are fish and the invertebrate vectors are leeches. Taxonomy The genus was created in 1910 by Henry who described the type species, ''Haemohormidium cotti'', in the short spined sea scorpion ('' Myxocephalus scorpius'') and the long spined sea scorpion (''Taurulus bubalis''). Its nature was unclear until the electron microscopic studies revealed its relationship to the Apicomplexia. Henry in 1913 abandoned the name but the genus was validated by Wenyon in 1926. The species in the genus '' Babesiosoma'' were initially incorporated into this genus in 1969 but have subsequently been demerged. Some authors consider this genus to be synonymous with ''Dactylosoma''. Henry also in 1910 described a second genus - ''Haematractidium'': this is now considered synonymous with ''Haemohormidium''. It seems that the taxonomy of this group may yet un ...
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Haematractidium
''Haematractidium'' is a genus of parasitic alveolates in the phylum Apicomplexa. It infects the Atlantic mackerel ('' Scomber scombrus''). History This genus was first described by Henry in 1910. Although it is occasionally re described very little is known about it. Taxonomy There is one known species in this genus: ''Haematractidium scombri''. Description The parasite is intra erythrocytic, ameboid, oval or pyriform in shape. There are no vacuoles or reticulation in the cytoplasm. The nucleus has two or more chromatin granules. The parasite has a single membrane. References Apicomplexa genera Parasites of fish {{Apicomplexa-stub ...
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