Petalomonas marginalis Larsen et Patterson 1990

Aydin, Esra Elif & Lee, Won Je, 2012, Free-living Heterotrophic Flagellates from Intertidal Sediments of Saros Bay, Aegean Sea (Turkey), Acta Protozoologica 51 (2), pp. 119-137 : 129

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).

Figures

Fig. 3. a – Petalomonas marginalis; b – Petalomonas minuta; c – Petalomonas ornata; d – Petalomonas poosilla; e–f – Ploeotia corrugata; e – general appearance of the cell from ventral and (f) dorsal view showing the ridges; g – Sphenomonas angusta; h – Ploeotia vitrea; i – Polyoeca dichotoma; j – Protaspis obliqua; k – Protaspis tegere; l – Salpingoeca marina; m – Pseudophyllomitus granulatus; n–p – ‘Aegoni’, n – postero-lateral view of the cell showing the beak – like structure; o – posterior view of the cell showing the flagellar insertions; p – general view of the cell. Scale bar: 5 μm for all figures.