Small Free-Living Heterotrophic Flagellates from Marine Sediments of Gippsland Basin, South-Eastern Australia Author Lee, Won Je text Acta Protozoologica 2015 54 1 53 76 https://www.mendeley.com/catalogue/2d9e5f2c-507d-342d-bf76-2776eae6f93a/ journal article 10.4467/16890027AP.15.005.2192 1689-0027 10994295 Mantamonas plastica Glücksman and Cavalier-Smith 2011 ( Figs 1g , 2x–y ) Observation: Cell outline is rhombic to oval. Cells are 3 to 4 µm long, flexible and flattened. The very fine anterior flagellum arises at the anterior end of the cell, is directed to the left and about the cell length. The posterior flagellum arises from a depression about one third of the cell length from the anterior end, appears to lie in a ventral groove or tightly adhere to the cell body and is 2 to 2.5 times the cell length. At times, cytoplasmic strands appear behind the posterior end of the cell. The cells glide slowly on the substrate. Not common and observed at Sts 31 and 41. Remarks: Recently, this species was found from a marine site in England ( Glücksman et al. 2011 ). It can be confused from some other species in Cercomonas because it has a flexible body, strands of cytoplasm from the posterior end of the cell and gliding movements, but can be distinguished by its smaller size, cell shape and flagellar orientation.