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The class name
Tribophyceae has succeeded Xanthophyceae to correspond to type genus Tribonema, instead of the color yellow
(xantho-)(Hibberd
1981). Previously the few known taxa
were placed in the Chlorophyceae because of their frequently green color.
The class Tribophyceae
currently includes ~ 100 genera and 600 species (Johnson 2011). They contain chlorophylls a and small
amounts of c1 and c2 in discoid chloroplasts. The principal accessory pigments include
the blue-absorbing yellow pigments B-carotene, vaucheriaxanthin,
diadinoxanthin, and heteroxanthin (van den Hoek et al. 1995).
As members of the heterokonts
– protists with two dissimilar flagella – the Tribophyceae produce the
polysaccharide chrysolaminaran (but not starch), soluble in aqueous solution,
and stored in vacuoles.
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References: |
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Johnson, L. 2011. Phylum Xanthophyta (Tribophyta)(Yellow-Green Algae). In: The Freshwater Algal
Flora of the British Isles, 2nd edition. John, D.M., B.A. Whitton, and A.J.
Brook, Eds. (878 pp).
van den Hoek, C., D.G. Mann, and H.M. Jahns 1995. Algae – An Introduction to Phycology. Cambridge University Press (623
pp.)
.
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