Rhodophyceae (red algae) A class of marine algae, most of them red in colour, whose basic shape is filamentous or membranaceous. They tend to occur at greater depths than the green algae (Chlorophyta) and they are among the oldest groups of eukaryotic algae, known from the Cambrian upwards. Epiphyton (Cambrian to Devonian) formed mounds and Solenopora (Lower Cambrian to Cretaceous) formed nodular masses made up of close-packed tubes. The coralline red algae, e.g. Lithothamnion, are important rock builders, constructing rigid structures and contributing lime mud to sediments.
More From encyclopedia.com
Red Algae , red algae Taxonomic group (phylum) of reddish algae, the Rhodophyta. They are numerous in tropical and subtropical seas. Most are slender, branching… Red Panda , Ailurus fulgens Red ★★★ 1991 , red a colour at the end of the spectrum next to orange and opposite violet, as the colour of blood, fire, or rubies. As a liturgical colour, red is u… Cinnabar , cinnabar The commonest mercury mineral, HgS; sp. gr. 8.0–8.2; hardness 2.0–2.5; trigonal; scarlet-red to brownish-red; vermilion streak; adamantine l… New Red Sandstone , New Red Sandstone Name given to the terrestrial red-bed deposits that overlie the Carboniferous. These deposits are of Permo-Triassic age. Red Lead , red lead • n. a red form of lead oxide used as a pigment.
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like