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

Haplomyxa saranae

Haplomyxa saranae Dellinger, 2014 Diagnosis: cell body from small rounded (0.1 mm) to large elongated shape (up to 3.5 x 0.3 mm), usually flat but

Read More »

Haplomyxa spec.

Main cell body Haplomyxa spec. Description: The cell has a central body from which numerous granuloreticulopodia emerge. The cell body can be small or large,

Read More »

Haplomyxa spec.

Haplomyxa spec. These video’s show an undescribed Haplomyxa species which was collected from a mesotrophic freshwater pond in the Netherlands, January 2020, and kept in Petri

Read More »

Chlamydophrys-schaudinn

Fritz Schaudinn (1871 – 1906) was a German zoologist. He was the co-discoverer of the causative agent of syphilis and did research on amoebas, particularly

Read More »

Alabasta longicollis

Alabasta longicollis, after Penard, 1890 Alabasta longicollis  (Penard, 1890) Diagnosis: Test pyriform, very elongated (3 times as long as wide), transparent, very little compressed, embedded

Read More »

Alabasta kivuense

Alabasta kivuense, after Gauthier-Lièvre and Thomas, 1961 Alabasta kivuense  Gauthier-Lièvre and Thomas, 1961 Diagnosis: In frontal view, the test is finger-shaped with subparallel sides, the

Read More »