Free-living Heterotrophic Flagellates from Intertidal Sediments of Saros Bay, Aegean Sea (Turkey) Author Aydin, Esra Elif Author Lee, Won Je text Acta Protozoologica 2012 51 2 119 137 https://www.mendeley.com/catalogue/6cf3745c-7fc3-3086-8e0b-e266c329ac0d/ journal article 10.4467/16890027AP.12.010.0514 1689-0027 13192960 Petalomonas marginalis Larsen et Patterson 1990 ( Figs 3a , 4m ) Observation: Cells are 23–25 μm long, oblong but with a narraw anterior part. A small ingestion apparatus is visible subapically near the canal. The cells have a strongly ridged dorsal groove, which runs along the right lateral side of the cell. One flagellum emerges from the flagellar canal and is slightly longer than the cell. The reservoir is located on the right ventral side of the cell and the nucleus is in the middle or posterior part of the cell. The cells move by gliding. Description based on two cells. Remarks: Generally, our observations are in good agreement with those of Larsen and Patterson (1990) and Lee (2006a) . This species is easily distinguished from other species in the genus Petalomonas by the ridged groove and the visible ingestion apparatus. It has been previoulsy reported from Fiji , the German Bight of the North Sea and Australia with cell length of 20–45 μm ( Larsen and Patterson 1990 , Hoppenrath 2000 , Lee 2006a ).