Ploeotia corrugata 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 : 132

Ploeotia corrugata Larsen et Patterson 1990 ( Figs 3e–f , 4n)

Observation: Cell outline ovate to oblong, 11–15 μm long and slightly emarginated posteriorly with a hook-shaped ingestion organelle. The cells are dorsally convex and ventrally flattened with seven ridges on the dorsal side of the cell. The cells have a slight ridge down the middle of the ventral side against which the recurrent flagellum lies. Two flagella are of unequal length. The anterior flagellum is about the cell length and beats rapidly from side to side with an irregular wave motion when gliding. The posterior flagellum is about 1.5 times the cell length and tapers slightly towards the posterior end. The reservoir is on the left ventral side of the cell. The cells move by smooth gliding. Description based on observations of two cells.

Remarks: Ploeotia corrugata differs from other Ploeotia species because it has a combination of an indented posterior end and 7 corrugated ridges on dorsal face. Our cells are in agreement with Larsen and Patterson (1990) and also with Ekebom et al. (1996) and Farmer and Triemer (1994), the latter under the name Lentomonas applanatum . Lentomonas applanatum (Preisig 1979) Farmer et Triemer (1994) and P. corrugata are quite similar because of the overlap of their size ranges and the number of the dorsal ridges, but these two species can not be synomised because of the uncertanity about the protrusion of the ingestion organelle in L. applanatum . This species was reported from marine sites worldwide, and previously reported cell length ranges from 7 to 20 μm ( Larsen and Patterson 1990; Patterson et al. 1993; Farmer and Triemer 1994; Ekebom et al. 1996; Patterson and Simpson 1996; Tong et al. 1998; Lee et al. 2003; Lee 2006a, 2012; Tikhonenkov et al. 2006).

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.