Microworld

world of amoeboid organisms

Menu
Matsakision cassagnaui
Matsakision – after Bonnet, 1967

Matsakision   Bonnet, 1967

Diagnosis: Shell hyaline, elongated ovoid, very little compressed, truncated perpendicularly or very slightly obliquely in the region of the pseudostome. Pseudostome acrostome or very slightly plagiostome, sub-circular, with a slight neck, which can sometimes be barely noticeable. Shell covered with elliptical scales, sub-circular near the pseudostome, without very clear orientation, not overlapping, although sometimes they may be contiguous, and embedded in a light yellow hyaline cement.
Type species: Matsakision cassagnaui Bonnet, 1967

Type location: Vityna Pass, Peloponnese, Greech. At 1000 m altitude, in sloping fir forest; powdery soil brought in by wind, at the base of mosses and of the fern Asplenium adiantum-nigrum, on limestone rock in the undergrowth.

Remarks: Bonnet (1967) did not observe living cells, but based on the general constitution of the shell he believed that this genus belonged to the Filosea. Matsakision can be distinguished from:
Corythion, by its extremely weak plagiostomy and by the pseudostome in the neck without invagination.
Cyphoderia, by the elliptical shape of the scales and by their completely different arrangement.
Cyphoderiopsis, by the fact that, in this last genus, the scales are circular and of variable size.

Recent posts

Actinosphaeridium spec.

Actinosphaeridium spec. Actinosphaeridium spec. Diagnosis: Cell surrounded by a kind of membranous shell. Filopodia with granules, sometimes branching. Cell not stalked, at least not observed.

Read More »

Euglyphidion

Euglyphidion enigmaticum – after Bonnet, 1960 Genus Euglyphidion Bonnet, 196 Diagnosis: Shell hyaline, ovoid, pseudostome circular or slightly elliptical. Shell loosely covered with two types of

Read More »

Leptomyxa spec.

Leptomyxa sp., slowly retracting in response to the light of the microscope Leptomyxa sp. Diagnose: This is a very large amoeba which I found in

Read More »

Zivkovicia spec.

Zivkovicia spec., 200 µm long; the right image is viewed through the aperture Zivkovicia spec.  Diagnosis: Shell pyriform, circular in oral view, with a clear

Read More »

Pontigulasia pentangulostoma

P. pentangulostoma, after Quin et al., 2008 Pontigulasia pentangulostoma Quin, Y., Xei, S., Gu, Y. and Zhou, X., 2008 Diagnosis: Shell is brown, laterally uncompressed,

Read More »

Flabellula citata

Flabellula citata, from Dykova et al., 2008 Flabellula citata Schaeffer, 1926 Diagnosis: Length in locomotion 15-75 µm; width 25-55 µm. Shape very variable, from a

Read More »