Microworld

world of amoeboid organisms

Menu
Choanocystis pertusa
From Siemensma, 1991

Choanocystis pertusa (Dürrschmidt, 1987) Siemensma, 1991

Diagnosis: Periplast, 50-60 µm in diameter (measurement based on whole mount), with two types of scales; details of protoplast unknown. Spine scales, 15-25 µm long, consisting of shaft and base-plate. Shaft, 0.2 µm thick, apparently solid or only partly hollow. Spines slightly tapering towards the distal end, apex with 4 margi­nal teeth. Shaft seated eccentrically to a heart-shaped base-plate, 1.4 µm in diameter. Plate scales, 5.6-6 x 3.3 µm, elliptical, sometimes slightly curved. Scale ornamenta­tion consists of n µmerous radial slits, 0.56 µm long and 0.07-0.14  µm wide, directly situated on both sides of the axial thickening, which is 3.0  µm long. Rest of the scale smooth.

Remarks: It is not possible to distinguish between C. granulata and C. pertusa with reference to the spine scales alone, though these of C. pertusa are 1/4 longer than those of C. granulata. The slit-pattern on the otherwise smooth plate scales, is the most characteristic feature of C. pertusa and plate scales are about twice as large as those of C. granulata.

Distribution: Sri Lanka.

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

Main cell body is surrounded by debris Haplomyxa sp. The cell body was hidden by debris and only once the whole cell was naked and

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 »

Lieberkuehnia spec.

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

Read More »