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

Rhizaspis armata

R. armata, 68 µm long, excl. spines – Laegieskamp Rhizaspis armata (Lauterborn, 1901) Dumack et al., 2021 Basionym: Pamphagus armatum Lauterborn, 1890 Diagnosis: Theca membranous,

Read More »

Rhizaspis spinosa

The original description with original drawings, Penard, 1890. Rhizaspis spinosa (Penard, 1890) Dumack et al., 2021 Basionym: Trinema spinosum Penard, 1890 Diagnosis: Theca membranous, ovoid

Read More »

Difflugia “pseudoclaviformis”

Difflugia “pseudoclaviformis”, front and side view, 424 µm Difflugia “pseudoclaviformis” Diagnosis: Shell pyriform, compressed, with a more or less pronounced aboral protuberance; shell composed of

Read More »

Difflugia from Lolo Pass

Shells 461-448 µm, stacked image. I found this large en remarkable shells in sediment of a small mountain lake near Lolo Pass, Montana USA. It differs

Read More »

Foraminifer drome

Unknown species, collected from the river Drôme, France, 2021 Unknown species September 2021, I found about ten specimens of an agglutinated foraminifer in a sample

Read More »

Cyclopyxis spec

Cyclopyxis spec., 168 µm Cyclopyxis spec. Diagnosis: Shell circular in ventral and dorsal view, more or less hemispherical in lateral view (height/diameter ≈ 0.5); lateral

Read More »

Difflugia fallax

Difflugia fallax, from Penard, 1902 Difflugia fallax Penard, 1890 Diagnosis: Shell hyaline or yellowish-greenish, black at low magnification, round in cross section, formed of a

Read More »

Zivkovicia compressoidea

Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942 Zivkovicia compressoidea  (Jung, 1942) new.comb. Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed,

Read More »

Zivkovicia flexa

Z. flexa, from Cash and Hopkinson, 1909 Zivkovicia flexa  (Cash and Hopkinson, 1909) Ogden, 1983 Basionym: Pontigulasia compressa var. flexa  Cash and Hopkinson, 1909 Diagnosis:

Read More »