Cercomonas parva ( Hartmann et Chagas, 1910 ) Mignot et Brugerolle, 1975

Lee, Won Je, 2019, Small Free-Living Heterotrophic Flagellates from Marine Intertidal Sediments of the Sydney Region, Australia, Acta Protozoologica 58 (4), pp. 167-189 : 180-181

Cercomonas parva ( Hartmann et Chagas, 1910) Mignot et Brugerolle, 1975

Figs 3b , 4e–f

Description: Cells are about 20 µm and flexible. A structure is seen on the left ventral side of the cell. Two flagella emerge subapically. The anterior flagel- laum is about the cell length and beats freely. The posterior flagellum is 1.3–1.8 times the cell length and appears to adhere tightly to the cell body in a ventral groove. Neither flagellum is acronematic. The cytoplasm contained many small particles. The nucleus is located in the anterior part of the cell. Pseudopodia and strands of cytoplasm were not seen under the cell or behind the posterior end of the moving cell. When the cell is moving, the anterior part of the cell slightly wobbles from side to side. Not often observed.

Remarks: Previously reported cell length is 6.5–20 µm ( Hartmann and Chagas 1910, Lemmermann 1914). The description here is well consistent with the description of Hartmann and Chagas (1910) who described it under the name Cercobodo parva , which was transferred once to Cercomastix by Lemmermann (1914). This species is similar to Cercomonas granulifera sensu Hollande, 1952 which has granules around the nucleus and is 12–15 µm long, but can be distinguished by the posterior flagellum tightly adhered to the cell body and lack of granules around the nucleus.

Figures

Fig. 3. Apusomonadida, Cercomonadida, Protaspidae, Thaumatomonadidae and Protista incertae sedis. (a) Apusomonas proboscidea, (b) Cercomonas parva, (c) Cercomonas sp.1, (d) Cercomonas sp.2, (e) Protaspa flexibilis sp. nov., (f) Thaumatomastix sp., (g) Eoramonas jungensis sp. nov., (h) Gweamonas unicus, (i) Phyllomitus undulans (from Lee 2002a), (j) Protist 1, (k) Protist 2. Scale bar = 10 μm for all figures.

Fig. 4. (a)–(b) Rhynchobodo longiciliatus, (a) general appearance of cell, (b) flagellar insertion into pocket. (c)–(d) Cercomonas sp.1, general appearance, note slender anterior part and hyaline cell body. (e)–(f) Cercomonas parva, (e) genera appearance showing a posterior fla- gellum attached to the body, (f) flexible body. (g)–(h) Cercomonas sp.2, general appearance, note both short flagella and cytoplasms drawn from the posterior part. (i) Cyranomonas australis, showing general appearance of different cells, note flagellar insertion. (j)–(k) Protaspa flexibilis sp. nov., general appearance of different cells, (j) nuclear caps around nucleus. All micrographs are DIC images. Scale bar in (k) = 10 μm for all figures with the exception of (b). Scale bar in (b) = 5 μm.