A key to marine species of Vannella (Sarcodina: Gymnamoebia), with descriptions of new species

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Abstract
A key to all nine described marine species of naked lobose amoebae classified in the genus Vannella Bovee, 1965, is presented. All six species studied with the electron microscope have the characteristic surface structure found also in freshwater members of the genus. The key includes five species isolated from British waters, including three new species; a fourth new species is from the Persian Gulf area. Generic identification of Vannella, even in mixed material, can be made readily with the electron microscope, which is sometimes necessary for positive distinction from Platyamoeba. Further identification to species is a light-microscopical procedure. Members of this genus are cultured on bacteria, which are probably their main food in nature.