Microworld

world of amoeboid organisms

Menu

Pterocystis scaposa

From Siemensma, 1991

Pterocystis scaposa  (Dürrschmidt, 1987) Siemensma, 1991
  
Diagnosis: Periplast, ca. 10 µm in diameter (measurement based on whole mount); details of protoplast unknown. Scales of two types. Plate scales, 1.2-1.5 X 0.6-0.8 µm, are patternless, except for a vestigially developed axial thickening. Spine scales, (1.1) 1.9-2.3 (7.2) µm long, consist of shaft, base-plate and lateral wings. Shaft narrow, non tubular, tapering to a blunt apex. Wings, ca. 0.08 µm broad, to be found on either side of the shaft. They are broadest just beyond the base-plate but then narrow gradually towards the distal end of the shaft. Base-plate, ca. 0.5 µm in dia­meter, reniform or heart-shaped, surrounded by a narrow peripheral rim.

Ecology: from the Banado Cruces, southern Chile (Dürrschmidt, 1985). Distribution: Chile, Sri Lanka.

Remarks: A. scaposa is remarkable in that two otherwise always separate charac­teristics are combined in its spine scales: lateral wings and heart-shaped base-plates.

Variation within A. scaposa is most noticeable with regard to the size of the spine scales. Whereas those from the majority of the Chilean habitats and from Sri Lanka vary from 1.9 to 2.3  µm, those from a swamp near Puerto Montt, Chile are 1.2 µm long. There is, however, no reason to believe that this difference should be considered anything but infraspecific variation. It may indicate the presence of different clones, or different stages in the cell or life cycle.

Recent posts

Euglypha bryophila

Euglypha bryophila, after Brown, 1911 (L), from Ecuador (R) Euglypha bryophila  Brown, 1911 Diagnosis: (Original description) The test is very regular in form and subject

Read More »

Vernalophrys

(A) A Scenedesmus cell (arrow) is engulfed by a trophozoite. (B) Several Scenedesmus cells adhere to the surface of a plasmodium that has numerous vacuoles

Read More »

Actinosphaeridium spec.

Actinosphaeridium spec. Diagnosis: Cell surrounded by a membranous shell, with an outer mucous layer. Filopodia with granules, sometimes branching. Cell stalked. Ecology: I found this

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 »