Amastigomonas debruynei de Saedeleer 1931

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 : 61

Amastigomonas debruynei de Saedeleer 1931 ( Fig. 2t )

Observation: Cells are 5 to 6.5 µm long, dorso-ventrally flattened and flexible. The anterior flagellum is shorter than the cell, emerges from the tip of a laterally directed sleeve and beats in a small angle. The posterior flagellum is slightly longer than the cell, lies in a groove along the margin of the cell, trails under the cell and occasionally protrudes behind the cell. Strands of cytoplasm may be drawn out behind the cell. The nucleus is situated in the anterior left of the cell. The cells move by gliding. Rarely observed.

Remarks: In this study the criteria for identifying morpho-species within Amastigomonas given by previous authors ( Molina and Nerad 1991, Mylnikov 1999, Lee and Patterson 2000) is used. According to Ekebom et al. (1996) and Lee and Patterson (2000), Amastigomonas debruynei has synonyms; Thecamonas trahens , A. borokensis and A. caudata . This species has been reported from marine sites in Australia, North Atlantic, Brazil, Arctic Canada, Denmark, England, Gulf of Finland, Greenland, Hawaii, Korea and Panama with lengths of 3–7.5 µm ( Larsen and Patterson 1990; Vørs 1992a, b, 1993a, b; Patterson et al. 1993; Ekebom et al. 1996; Tong 1997a, b; Tong et al. 1998; Lee and Patterson 2000; Al-Qassab et al. 2002; Lee et al. 2003; Lee 2002b, 2006b). It appears to be cosmopolitan. Further works are required to clarify the identities of species in this genus.

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.