Description
Spores are inoperculate and have one uninucleate sporoplasm without a spherulosome but with haplosporosomes (Fig . 11 ). Spore wall is loosely fitted around the sporoplasm and is covered with fine ridges on the external surface of the wall . Plasmotomy yields uninucleate sporoblasts , each of which becomes a spore with the addition of a wall synthesized on the sporoblast plasmalemma. Found in a fresh water isopod and a marine amphipod. Two named species . OTHER SPECIES Species of the genera Bonamia and Mikrocytos are oyster parasites which have not yet been assigned to a family but are suspected to be Haplosporidia because they possess haplo- sporosomes . However, they have not been observed to form spores , and, therefore, can not be definitively allied with any established group. Species of both genera are small (2 to 6 1-1 m) parasites which multiply in oyster hemocytes and branchial epithelia (Montes et al. , 1994) where they are found in phagosomes or parasitophorous vacuoles. In contrast and where descriptions are of sufficient detail to make a judgement, the established species of Haplosporidia m u It i pI y extracellularly and only the smaller cells are found in hemocytes where multiplication has not been observed (Scro and Ford, 1990) . The cells are simple, containing usually one nucleus or sometimes two nuclei. Rarely , plasmodia with four or five nuclei can be found (Brehelin et al , 1982). The mitotic apparatus is the same as in the established species of Haplosporidia (Pic hot , et al. , 1980) . Haplosporosomes are found in the cytoplasm and , at least in Bonamia sp ., are derived in part from multivesicular bodies (Hine and Wesney, 1992) as in Hap/osporidium nelsoni (Perkins, 1979). HAPLOSPORIDIA Tig Gen No cel ost Mem bod one abs gil Pac fro com TYP & E Aze Bonamia sp. from the oyster Tiostrea chilensis, with paired nuclei and located in hemocyte . Haplosporosome (H) . Provided by P.M. Hine. Bar=1 Aze 1-Jm .
Type species
Claustrosporidium gammari (Ryckeghem , 1930) Larsson , 1987
Figures
Raw text
Spores are inoperculate and have one uninucleate sporoplasm without a spherulosome but with haplosporosomes (Fig . 11 ). Spore wall is loosely fitted around the sporoplasm and is covered with fine ridges on the external surface of the wall . Plasmotomy yields uninucleate sporoblasts , each of which becomes a spore with the addition of a wall synthesized on the sporoblast plasmalemma. Found in a fresh water isopod and a marine amphipod. Two named species . OTHER SPECIES Species of the genera Bonamia and Mikrocytos are oyster parasites which have not yet been assigned to a family but are suspected to be Haplosporidia because they possess haplo- sporosomes . However, they have not been observed to form spores , and, therefore, can not be definitively allied with any established group. Species of both genera are small (2 to 6 1-1 m) parasites which multiply in oyster hemocytes and branchial epithelia (Montes et al. , 1994) where they are found in phagosomes or parasitophorous vacuoles. In contrast and where descriptions are of sufficient detail to make a judgement, the established species of Haplosporidia m u It i pI y extracellularly and only the smaller cells are found in hemocytes where multiplication has not been observed (Scro and Ford, 1990) . The cells are simple, containing usually one nucleus or sometimes two nuclei. Rarely , plasmodia with four or five nuclei can be found (Brehelin et al , 1982). The mitotic apparatus is the same as in the established species of Haplosporidia (Pic hot , et al. , 1980) . Haplosporosomes are found in the cytoplasm and , at least in Bonamia sp ., are derived in part from multivesicular bodies (Hine and Wesney, 1992) as in Hap/osporidium nelsoni (Perkins, 1979). HAPLOSPORIDIA Tig Gen No cel ost Mem bod one abs gil Pac fro com TYP & E Aze Bonamia sp. from the oyster Tiostrea chilensis, with paired nuclei and located in hemocyte . Haplosporosome (H) . Provided by P.M. Hine. Bar=1 Aze 1-Jm .