Apusomonas sp.

Lee, Won Je, 2015, Small Free-Living Heterotrophic Flagellates from Marine Sediments of Gippsland Basin, South-Eastern Australia, Acta Protozoologica 54 (1), pp. 53-76 : 62

Apusomonas sp. ( Figs 1e , 2v )

Observation: Cell is about 7 µm long and dorso-ventrally flattened with a single flagellum. Cell outline is ovate. The mastigophore emerges from a cavity about half of the cell length from the anterior end, is flexible. The flagellum is partly in a sleeve, which arises at the distal end of the mastigophore. The length of the flagel- lum plus the mastigophore is longer the cell. No structure seen on the dorsal and ventral sides. The cell glides closely to the substrate. One cell was observed at St. 38.

Remarks: The cell observed here is assigned to the genus Apusomonas because of its mastigophore and its cell appearance. It was identified to genus because of lack of information. This genus has been usually found from freshwater sites and soils (e.g., Vickerman et al. 1974; Karpov and Zhukov 1980, 1986; Ekelund and Patterson 1997), but recently A. proboscidea was reported from a marine sediment in tropical Australia ( Lee 2006b).

Figures

Fig. 1. a – Chilomastix cuspidata, b – Rhynchopus amitus, c – Spironema multiciliatum, d – Psammosa unguis nov. comb., e – Apusomonas sp., f – Rhynchobodo formica, g – Mantamonas plastica, h – Roombia truncata, i – Thaumatomastix setifera, j – Ancyromonas impluvium nov. spec., k – Helkesimastix faecicola, l – Kurnaimonas celerisnov. spec., m – Sinistermonas sinistrorsus nov. spec., n – Kiitoksia kaloista, o – Protist ‘1’. Scale bar: 10 µm for all figures.

Fig. 2. a – Chilomastix cuspidata, showing general appearance of cell; b – Goniomonas amphinema, showing general appearance of cell; c – G. pacifica, note two flagella diverging; d – Percolomonas similis, note ventral groove; e – Bodo platyrhynchus; f – Neobodo curvifilus; g – N. saliens; h–i – Hemistasia phaeocysticola, note a papillum (arrow); j – Bordnamonas tropicana, showing general appearance and mouth (arrow); k – Rhynchomonas nasuta; l–o – Rhynchobodo simius; l – tubular ingestion organelle (arrow); m, o – showing groove; n – general appearance of cell; p–q – Rhynchopus amitus; r–s – Spironema multiciliatum; t – Amastigomonas debruynei, general appearance of cell; u – Amastigomonas mutabilis, note anterior flagellum projecting from sleeve and recurrent flagellum; v – Apusomonas sp.; w – Psammosa unguis nov. comb., general appearance of cell; x–y – Mantamonas plastica; x – note anterior flagellum (arrow) and y – ventral depression.All micrographs are DIC images. Scale bar: 5 µm for all figures.