Ebriid

Ebria tripartita

The Ebriacea are a small group of heterotrophic flagellates, which consists of only two planktonic species occurring in the sea. Their systematic position has long been unclear, today they are made to the Cercozoa.

Features

The representatives are unicellular, swimming flagellates. The two scourges put on subapical. They possess an inner, solid skeleton of branched or perforated silicate rods. The cells are naked, so they have no outer cell wall. In a work, however, a layer of fibrillar material was observed outside the cell membrane.

Your cell nucleus is large and has a conspicuous nucleolus and the chromosomes are condensed in the interphase.

Dissemination and nutrition

The Ebriacea are found worldwide in coastal marine plankton. They usually only occur in low densities. While Ebria found in cold to temperate waters, is found Hermesium in warm waters. They feed on phytoplankton phagotroph. The type of food intake is unknown, the lack of a cell mouth suggests the food intake by pseudopodia, whose existence is, however, not been conclusively demonstrated.

System

The systematic position of the Ebriacea has long been unclear. In the 20th century they were assigned different names to the Silicoflagellatae, the dinoflagellates, the Sarcomastigophora, the Opalozoa and Neomonada. In the scheme of eukaryotes by Adl et al. 2005, they were designated as incertae sedis within the eukaryotes. Molecular genetic studies on Ebria tripartita showed in 2006 that the group belongs to the Cercozoa. Here they are along with several non-cultivated samples, the sister group of the Cryomonadida.

The Ebriacea tart consist of only two secure ways:

• Ebria tripartita
• Hermesinum adriaticum

The group is fossil since the Cretaceous known, their highest diversity in the Miocene they reached.

Documents

• Sina M. Adl et al.: The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists. The Journal of Eukaryotic Microbiology, Volume 52, 2005, pp. 399-451 (Abstract and full text)
• Mona Hoppe Rath, Brian S. Leander: Ebriid Phylogeny and the expansion of the Cercozoa. Protist, Volume 157, 2006, pp. 279-290, doi: 10.1016/j.protis.2006.03.002

• Cercozoa (Taxon )
• Cercozoa