Microworld

world of amoeboid organisms

Menu
Pterocystis paliformis
From Siemensma, 1991

Pterocystis paliformis  (Dürrschmidt, 1987) Siemensma, 1991
  
Diagnosis: Periplast 8-15 µm in diameter (measurement based on whole mount); details of protoplast unknown. Scales of two types. The spine scales are almost spade-form, 4.5 µm long and max. 2.3 µm breadth. The shaft is reduced to a short hollow ridge of varying breadth, ending distally with a blunt apex. The lateral wings and the basal wing are narrow rimmed and joined to the spade-like form of the spine scales. The wings on either side of the shaft run almost parallel to it but then narrow abruptly and terminate sub-apically. The area around the “shaft base” is depressed to a concavity. The plate scales, 2.5 X 1.5 µm, are elliptical or ovoid. The scales are thin and narrow- rimmed. The central swelling is rudimentarily developed and slightly shifted to the smaller pole of the scale.

Remarks: A. paliformis is conspicuous by virtue of the remarkable similarity between the plate and spine scales. It appears that the structure, which forms the shaft in the spine scales might be identical with the central swelling in the plate scales. Other corresponding points are the concave depression at the basal end of the shaft and the way the width of the shaft and the central swelling varies in both scale types.

Distribution: Chile, New Zealand.

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 »