Microworld

world of amoeboid organisms

Menu
Choanocystis lepidula

Choanocystis lepidula (Penard, 1904) Siemensma & Roijackers, 1988

Diagnosis: Cell diameter 10-18 µm, periplast up to 23 µm; spine scales 7.1-9.5 µm long; shaft cylindrical, 0.22 µm thick and with an abruptly cut off apex; shaft curved proximally and seated at the apex of an invagination of the basal plate; basal plate 1.7-1.8 µm in diameter and surrounded by an upwardly bent rim, ca. 0.1 µm thick; basal plate extends for a short distance along the shaft; plate scales 4.2-5.2 x 2.3 µm, ovoid to oblong, with a central depression, ornamented with irregularly distributed granules and with a narrow longitudinal rib.

Remarks: I have seen many proximally curved spine scales, but also many more or less straight shafts were observed. Therefore, it is likely that not all specimens have the typical habitat as shown by Penard’s (1904) single figure. Two related species are Choanocystis perpusilla and C. rotundata. The first differs from C. lepidula in having two teeth on its apex. The plate-scales of C. rotundata are smooth, whereas those of C. lepidula have a longitudinal rib.

Choanocystis lepidula
Choanocystis lepidula, with the typical proximally curved spine-scales arranged around the axopodia – Laegieskamp.
Choanocystis lepidula
Choanocystis cf. lepidula
Recent posts

Penardochlamys arcelloides

P. arcelloides – after Penard, 1904 Penardochlamys arcelloides  (Penard, 1904) Deflandre, 1953 Diagnosis: Colorless or very slightly yellowish envelope, bag or cauldron-shaped, very thin, chitinous,

Read More »

Reticulomyxa hannae

R. hannae, plasmodium – photomicrograph Steffen Clauss Reticulomyxa hannae Völcker and Clauß, 2020 Diagnosis: Trophozoites surrounded by a very thin mucous envelope, with slowly moving plasmodia, variable

Read More »

Velamentofex saxonensis

V. saxonensis, feeding (photomicrograph Steffen Clauss) Velamentofex saxonensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 30-95 μm, granuloreticulopodia up to 1000 μm long. with a hyaline, thin

Read More »

Velamentofex tyrolensis

V. tyrolensis (photomicrograph Steffen Clauss) Velamentofex tyrolensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 98-125 μm, with reticulopodia up to 300 μm long, with a hyaline,

Read More »

Velamentofex berolinensis

V. berolinensis Velamentofex berolinensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 50-300 µm, with a hyaline, extremely flexible, membranous test. Nuclei numerous, 11.6-16.2 µm in diameter,

Read More »

Lieberkuehniidae

 Lieberkuehniidae  Siemensma, Holzmann, Apothéloz-Perret-Gentil, Clauß, Voelcker, Bettighofer, Khanipour Roshan, Walden, Dumack and Pawlowski, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test very flexible, elongated to broadly

Read More »