Glaucophyta
Glaucophyta
Phylum recognized by
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Inhaltsverzeichnis
General Description
Description of Glaucocystophytes
Circumscription:Eukaryotes with cyanelles (reduced cyanobacteria) but with a wide array of trophic forms (flagellates, nonmotile coccoid organisms, palmelloid). Presence or absence of a cellulosic cell wall, presence or absence of a mucilage sheath. Given the variation, monophyly, which is largely based on the cyanelles, requires confirmation. Ultrastructural identity: Considerable variation, mitochondria with flat cristae. With flattened sacs under cell membrane; which in some species may produce scales. Dictyosomes present and may be associated with the nucleus or with the flagellar apparatus, cyanelles present with or without a surrounding wall. Differing numbers of multilayered structures associated with the flagellar anchorage system if flagella are present. Flagella if present may have fine hairs. Nuclear envelope breaks down during mitosis, basal bodies/centrioles not used to nucleate spindle microtubules. Synapomorphy: None available but probably platycristate protists with cyanelles with subsurface layer of sacs.
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