Microworld

world of amoeboid organisms

Menu

Pterocystis discoidea, Rote Wasser, Germany – Photomicrograph Eckhard Voelcker

Pterocystis discoidea  (Dürrschmidt, 1985)
  
Diagnosis: Periplast 10-15 µm, protoplast unknown; spine-scales circular or broad oval, 3.41-4.1 µm in diameter, dish-shaped with a broad structureless border and a central part with radiating ribs; emitted from a strongly rudimentary shaft; plate-scales relatively small, elliptical and thin 0.75 X 0.6 -1.1 µm; central rib slightly shifted to one pole.

Ecology: only known from Sphagnum and a small pond. Chile (Dürrschmidt, 1985), Germany (Eckhard Voelcker, 2014, pers. comm.)
  
Pterocystis discoidea - Ferry Siemensma

Pterocystis discoidea, a spine-scale, b plate-scale – after Siemensma, 1991

Pterocystis discoidea, Rotes Wasser, Germany – Photomicrograph Eckhard Voelcker
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 »