Microworld

world of amoeboid organisms

Menu
Pterocystis veliformis
From Siemensma, 1991

Pterocystis veliformis (Dürrschmidt, 1987) Siemensma, 1991

Diagnosis: Periplast, 10—20 µm in diameter (measurement based on whole mount), with two types of scales; details of protoplast unknown. The spine scales are reminis­cent of a sail. The shaft is reduced to a short hollow rib. The lateral wings are continued along the whole length of the shaft reaching the maximum breadth in the lower 3rd of the scale. From here towards the proximal end they are closely anchylosed with the basal wing and form a short patternless stalk, sometimes only present as a concave depression around the proximal shaft end. The lateral wings are ornamented with thin, delicate ribs, which run transverselly or obliquely from the shaft to the outer margin. Ribs are also present on the front part but here they run inwards from the outer margin.

Plate scales are small, 0.9—1.3 x 0.6—0.8 µm, ovoid or, more rarely, elliptical. They are patternless except for an axial thickening which is slightly shifted to the smaller pole of the plate scale, and a narrow peripheral rim. As indicated by SEM micrograph they are not even but with distinctly concave middle parts, elevated submarginal parts and slightly inflexed margins.

Distribution: Chile, Canada.

Recent posts

Velamentofex

Velamentofex tyrolensis Family Velamentofexidae Völcker and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to pyriform, usually surrounded by a broad layer of mucus-like

Read More »

Claparedellus lachmannii

Claparedellus lachmannii, common shape (Riedensee) Claparedellus lachmannii  Khanipour Roshan and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to elongated pyriform or irregularly shaped, with a

Read More »

Claparedellus

Claparedellus lachmannii Genus Claparedellus Khanipour Roshan and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to elongated pyriform or irregularly shaped, with a hyaline, flexible,

Read More »

Haplomyxa spec

Fig. 1: Main cell body of specimen A, partly hidden by debris Haplomyxa sp. Three specimens were observed in a Petri dish, along with two

Read More »

Edaphoallogromiidae

Edaphoallogromia australica Family Edaphoallogromiidae Siemensma, Holzmann, Apothéloz-Perret-Gentil, Clauß, Voelcker, Bettighofer, Khanipour Roshan, Walden, Dumack and Pawlowski, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera with a spherical

Read More »

Lachmanni spec.

“Lachmanni spec., body length 127 µm “Lachmanni” spec. I found two cells, size about 125 µm when ovoid, with an organic-walled membranous test and a

Read More »