Monosiga brevicollis Ruinen 1938

Aydin, Esra Elif & Lee, Won Je, 2022, Free-living Heterotrophic Flagellates Lakes in Turkey (Protista) from Two Hypersaline, Acta Protozoologica 61, pp. 85-98 : 87

publication ID

https://doi.org/ 10.4467/16890027AP.22.008.17111

DOI

https://doi.org/10.5281/zenodo.10994594

persistent identifier

https://treatment.plazi.org/id/AF4987FE-FF91-033D-8074-E70AFD2E4B87

treatment provided by

Felipe

scientific name

Monosiga brevicollis Ruinen 1938
status

 

Monosiga brevicollis Ruinen 1938 ( Figs 2o View Fig , 3o View Fig )

Cells are 4–6 µm long and spherical in the resting state. Swimming cells are more ovoid with a sharpened posterior end and a spread out collar. The collar is about 0.5 times the cell length, while the flagellum is 4–5 times the cell length. The cytoplasm is fine-grained to hyaline and contains strongly retractile grains with a vacuole lying in the posterior part of the cell. Description based on the observations of 16 cells. Occurance: every month with the exception of July and August at Meke Lake, temperature 0–21 °C, salinity 107.5– 215 psu, dissolved oxygen 0.25–5.18 mg /L.

Remarks: As mentioned before by Tong et al. (1997), the species identities of this genus are not clear. Their shapes and lengths may change according to swimming or resting states ( Tong et al. 1997). In general, our observations are in agreement with the original description of Ruinen (1938). Four species, of three by Ruinen (1938) and one by Post et al. (1983), were reported from hypersaline environments: i) Monosiga consociatum Kent, ii) M. ovata Kent, iii) M. brevicollis Ruinen , and iv) Monosiga sp. Monosiga brevicollis differs from M. consociatum with its unique cell shape, short collars and more or less shorter flagellum. The extension of the collar is wider at M. brevicollis compared to M. consociatum . Monosiga brevicollis resembles M. ovata in general cell shape, but the length of flagellum and the collar are quite different. The collar is shorter and the flagellum is longer than that of M. brevicollis’ ( Throndsen 1974). Monosiga brevicollis is reported from Portugal to India (Ruinen 1938), as well as eastern and south-eastern Norway ( Throndsen 1974).

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