Cyranomonas australis Lee 2002

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 : 125

Cyranomonas australis Lee 2002 ( Figs 1i , 2h )

Observation: Cell 5.5–6 μm long, ovoid in oultline, dorso-venrally flattened and slightly flexible. Two non-acronematic and thickened flagella emerge from the right hand side of the cell. The tapering anterior flagellum is about 1.2 times the cell length and flickers forward. The posterior flagellum is about 1.5 times the cell length and trails behind the cell. The cells move slowly by gliding with the anterior flagellum. Description based on observations of four cells.

Remarks: Our observations are in agreement with the observations of Lee (2002). Cyranomonas australis resembles Rhynchomonas nasuta in gliding and beating behaviour of the anterior flagellum, but can be distinguished by the lack of the bulbous snout which is the characteristic of R. nasuta and by the trailing flagellum not being acronematic. This genus resembles Amastigomonas in general body shape, but Amastigomonas can produce pseudopodia ventrally and has a thin dorsal theca that also encloses the anterior flagellum basally or completely. Both flagella of the genus Amastigomonas may sometimes be difficult to see whereas the flagella of Cyranomonas are visible at all times. Cyranomonas australis resembles Neoheteromita caudratti Howe et al. 2009 , but the genus Neoheteromita has a changeable body shape with an ameboid end. This species has been found from marine sites in Australia, Korea and UK ( Tong 1994; Lee 2001, 2002).

Figures

Fig. 1. a – Actinomonas mirabilis/Pteridomonas danica; b – Amastigomonas mutabilis; c – Ancyromonas micra; d – Bicosoeca conica; e – Bordnamonas tropicana; f – Caecitellus parvulus; g – Cafeteria minuta; h – Cafeteria roenbergensis; i – Cyranomonas australis; j – Developayella elegans; k – Discocelis saleuta; l – Goniomonas amphinema; m – Goniomonas pasifica; n – Kiitoksia ystava; o – Dinema platysomum; p – Anisonema acinus; q – Heteronema exaratum; r – Heteronema ovale; s – Kathablepharis remigera; t – Notosolenus canellatus; u – Massisteria marina; v – Metromonas grandis; w – Neobodo designis; x – Neobodo saliens; y – Percolomonas similis. Scale bar: 10 μm for all figures.

Fig. 2. a – Actinomonas mirabilis/Pteridomonas danica; b – Amastigomonas mutabilis; c – Ancyromonas micra; d – Bicosoeca conica; e – Caecitellus parvulus, note the mouth on the left-hand side; f – Bordnamonas tropicana; g – Cafeteria roenbergensis; h – Cyranomonas australis; i – Developayella elegans; j – Discocelis saleuta; k – Goniomonas amphinema; l – Cafeteria minuta, feeding cell; m – Anisonema acinus, dorsal view, note the ingestion organelle; n – Dinema platysomum, ventral view showing surface striations; o – Goniomonas pacifica; p – Heteronema exaratum, ventral view, general appearance of cell; q – Kathablepharis remigera; r – Massisteria marina; s – Neobodo saliens; t – Neobodo designis; u–v – Heteronema ovale, same cell; u – general appearance; v – extended cell. All micrographs are DIC images. Scale bar: 5 μm for all figures.