Eocercomonas

Eocercomonas ramosa is a heterotrophic flagellate living from the group of Cercomonadida. It is the only species of the genus Eocercomonas.

Characteristics of the genus

There are moving, usually fusiform Cercomonaden, the rear scourge has nachschleift and backward. The genus differs from the closely related genera Cercomonas and Paracercomonas by the following features: it has a dorsal, posterior microtubule band and a nuclear fibrous, striated root. From Cercomonas distinguishes the lack of a core extension to the centrioles out there missing at both centrioles cartwheels, and both centrioles possess a proximal transverse plate. From the front centriole reaches back a long, fibrous, striated root to the nucleus. Mitochondrial cristae have the shape of round tubules. Furthermore, the type is defined by three diagnostic sequence sections in the 18S rRNA.

Characteristics of the type

Eocercomonas ramosa is sliding, spindle-shaped cells 5 to 15 microns in length. The proximal part of the anterior flagellum is surrounded by a cytoplasmic sheath. It is usually more than twice as long as the cell body in the floating state. The posterior flagellum is usually not visible and rear stands only slightly above the cell addition. The contractile vacuole is located in the front range of cells. At the stage of food intake, they form highly branched, very slender pseudopodia. You can join together to form consortia. In the flagellum apparatus, the dorsal anterior root set on wide apart on the anterior centriole.

Dissemination

The trunk on which the first description is based was taken from a freshwater lake in Antarctica.

System

The genus Eocercomonas was separated in 2006 from the genus Cercomonas and forms the sister group:

Clade A1 = Cercomonas

Clade A2 = Eocercomonas

Clade B1 = Paracercomonas

Two unnamed Cercomonaden

Documents

• Serguei A. Karpov, David Bass, Alexander P. Mylnikov, Thomas Cavalier- Smith: Molecular Phylogeny of Cercomonadidae and Kinetid Patterns of Cercomonas and Eocercomonas Gen. nov. ( Cercomonadida, Cercozoa ). Protist, Volume 157, 2006, pp. 125-158, doi: 10.1016/j.protis.2006.01.001