WebThe larger upper portion of the frustule is called the epitheca. The smaller lower piece is the hypotheca. The epitheca fits over the hypotheca like the lid fits over a shoe box. The singular algal diatom cell lives protected inside the frustule halves like a pair of shoes snuggled within a shoe box. WebIn addition, the hypotheca must fit inside the epitheca. So, with each mitotic division, the daughter cell inheriting the parental epitheca forms a new hypotheca of the same size as the original one, but the daughter inheriting the parental hypotheca now uses it as an epitheca and produces a slightly narrower hypotheca inside it.
Plant Life: Diatoms - Blogger
WebWhat is Epitheca and Hypotheca? is that epitheca is (microbiology planktology) the upper half of the theca of a thecate protist such as a diatom or dinoflagellate while hypotheca is (microbiology planktology) the lower or posterior half of the theca of a thecate protist such as a diatom or dinoflagellate. How does a diatom move? Webnoun. epi· theca. "+. 1. : an external calcareous layer investing the lower portion of the theca of many corals. 2. : the outer or upper half or valve of the diatom frustule … internet offered at my address
Hypotheca Glossary - Diatoms of North America
WebApr 4, 2024 · The epitheca covers the hypotheca. It resembles the shape of a soapbox. Their cell wall has a presence of cellulose and this makes their cell wall transparent in nature. They are a pennate and centric type of symmetry. Their resting spores are known as stratospheres. 2. What do you understand by Diatomaceous Earth? WebThe cells are normally protected by a wall called a frustule,composed of silica (SiO2) and surrounded by mucilage. The frustula is composed by two valves epithecaor epivalve (larger) and hypothecaor hypovalve (smaller). The loops inserted between the valves are the Girdle bands or cingulum. Figure 1. (Diatom frustule ) Figure 2. WebThe epitheca of T. cephalotus is round (Fig. 6b), while more or less ellipsoidal in T. gravidus or T. praelongus. The hypotheca of T. cephalotus has short antapical horns, while T. gravidus or... new commercial hotel