Description
HEYWOOD & LEEDALE , 1983 by PETER HEYWOOD and GORDON F. LEEDALE Raphidomonads are biflagellated motile or palmelloid unicells lacking cell walls. Cells are ovoid to almost spherical , occasionally pyriform , occasionally lanceolate . They are often flattened dorsoventrally with a furrow on th e ventral surface . Chloroplasts are few (5) to many in number and contain chlorophylls a and c. An extensive Golgi apparatus often forms a ring over the anterior surface of the nucleus . Some species contain extrusomes (trichocysts or mucocysts). Interp hase nuclei and mitotic chromosomes are comparatively large . Meiosis and fertilization have not been described . Cysts are known for some genera. No fossils have been reported . Freshwater genera ( Gonyostomum, Merotricha, and Vacuo/aria) and marine genera ( Chattonella , Fibrocapsa, Heterosigma, and 0/isthodiscus) are recognized . Raphidomon ads may be locally abundant , giving rise to blooms . The order Raphidomonadida was often termed the Chloromonadophyceae (or some variant of this name) in algal literature; in classifications of the Protozoa the group was usually the Chloromonadida . These names were inappropriate , since the genus Chloromonas is not included within the class or order. We proposed (Heywood and Leedale, 1985) that the
Type species
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Raw text
HEYWOOD & LEEDALE , 1983 by PETER HEYWOOD and GORDON F. LEEDALE Raphidomonads are biflagellated motile or palmelloid unicells lacking cell walls. Cells are ovoid to almost spherical , occasionally pyriform , occasionally lanceolate . They are often flattened dorsoventrally with a furrow on th e ventral surface . Chloroplasts are few (5) to many in number and contain chlorophylls a and c. An extensive Golgi apparatus often forms a ring over the anterior surface of the nucleus . Some species contain extrusomes (trichocysts or mucocysts). Interp hase nuclei and mitotic chromosomes are comparatively large . Meiosis and fertilization have not been described . Cysts are known for some genera. No fossils have been reported . Freshwater genera ( Gonyostomum, Merotricha, and Vacuo/aria) and marine genera ( Chattonella , Fibrocapsa, Heterosigma, and 0/isthodiscus) are recognized . Raphidomon ads may be locally abundant , giving rise to blooms . The order Raphidomonadida was often termed the Chloromonadophyceae (or some variant of this name) in algal literature; in classifications of the Protozoa the group was usually the Chloromonadida . These names were inappropriate , since the genus Chloromonas is not included within the class or order. We proposed (Heywood and Leedale, 1985) that the