Some species are straight and needle-like, but most are broader with curved ends €“ rather like a smile. Closterium regulare was first described from Lower Normandy by Brebisson. The ends of the cell are usually tapered and may be pointed or rounded. The desmid is formed of two hemicells that are also mirror images of each other €“ but there . Published in: Reimann, B.

The diatom genus Cylindrotheca Rabenhorst. In two representative heterothallic species, the steps and methods of intercellular communication were fully described. Glycoproteinaceous sex . Cellene er smale, sylindriske, bøyde og avsmalnet i endene. På dansk kalles denne gruppen for månealger. Ofte med en vakuole i spissen med kalkkrystaller.

Unicellular desmid with elongated cells tapering at both ends. Cells usually crescent shape rarely straight.

There are always two chloroplasts containing numerous pyrenoids, separated in the middle of the cell by a clear area that contains the nucleus (which is often visible). Class: Zygnematophyceae. Hosted by the USGS Core Science Analytics and Synthesis. Page designed through the cooperative efforts of interagency ITIS Teams. Thier-Arten der Kreideformation der Erde.

Abe J(1), Hori S, Tsuchikane Y, Kitao N, Kato M, Sekimoto H. Author information: (1)Department of Chemical and Biological Sciences, Faculty of . Some are quite straight and needle-like, while others are much broader with curved ends. Each semicell has a single axial, ridged chloroplast with at least one pyrenoid. Infrakingdom Heterokonta. At first glance, the cell wall seems to be smooth but at high magnification it appears delicately striate. The chloroplast contains an . It lacks the isthmus of the general description above but has at the extreme ends of each semi-cell a small spherical vacuole in which varying numbers of tiny particles can be seen in constant agitated motion.

Desmids can be found in all kinds of shapes. Remarkable features are the tiny crystals that move within the small cavities at the outer ends of the cell. Molecular phylogenic analysis was used to verify the initial species determination based on its morphology, and it was confirmed to be closely related to another identified strain of the species.

Species, Cylindrotheca closterium. Division, CHRYSOPHYTA (HETEROKONTOPHYTA). Order, BACILLARIALES (PENNALES). Geometric shape, rotational ellipsoid. Note the central overlap of the two wall pieces.

Description: Cells elongate-cylindrical and curve rarely straight elongate- fusiform, gradually narrow toward acutely pointe rounded or truncate apices. Girdle bands present in some species. Chloroplasts two (rarely four) per .