Sinistermonas sinistrorsus nov. spec., 2015

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 : 68-69

publication ID

https://doi.org/ 10.4467/16890027AP.15.005.2192

DOI

https://doi.org/10.5281/zenodo.12522349

persistent identifier

https://treatment.plazi.org/id/0B708784-E66C-893F-FCBA-FAF127C2D00F

treatment provided by

Felipe

scientific name

Sinistermonas sinistrorsus nov. spec.
status

sp. nov.

Sinistermonas sinistrorsus nov. spec. ( Figs 1m View Fig , 4l View Fig )

Diagnosis: Sinistermonas . Cells ovoid, 5 to 8 µm long, rigid, slightly dorso-ventrally flattened. Two flagella of unequal length, beating always to left in small excursion. Move by gliding.

Observation: Cells are ovoid, 5 to 8 µm long, rigid, slightly dorso-ventrally flattened, and with two flagella of unequal length in the same strength. The anterior flagellum emerges sub-apically near the right margin of the cell and directs forwardly to the left direction. It is 1 to 1.5 times the length of the cell and beats always to the left direction in a small excursion. The posterior flagellum emerges near the anterior flagellum and trails behind the cell. It is 2.5 to 3.5 times the length of the cell. The nucleus is located anteriorly. The cells move fast by gliding with the beating of the anterior flagellum. Relatively rare. Description based on observations of five cells.

Remarks: Sinistermonas is similar to Protaspa in being flattened, and having two flagella emerging subapically and anteriorly located nucleus, but it lacks nuclear caps. This species is mostly similar to Protaspa gemmifera , but can be distinguished by its smaller size, and the lack of reserve materials and nuclear caps. It is also different in the position of flagellar insertion. Sinistermonas sinistrorsus is distinguished from Protaspa simplex 1992 because P. simplex lacks the distinguishing characters of Protaspa . It is similar to Cyranomonas australis ( Lee 2002b) in general appearance and cell size, but can be easily distinguished by the flexible body of Cyranomonas and also the position of flagellar insertion. The anterior flagellum of C. australis emerges from the anterior end of the cell, and the posterior flagellum inserts just below the anterior flagellum.

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