portrait

Description:

Codosiga (co-dough-sigh-ga) also known as Codonosiga (co-dough-know-sigh-ga), choano-flagellate (collar flagellate) with a single apical flagellum surrounded by a collar of fine pseudopodia. This cell is stressed and has become spherical and the collar has been withdrawn. Normally many cells are attached to the stalk. Phase contrast.