world of amoeboid organisms

Menu

 

Difflugia claviformis
Difflugia claviformis, front and side view, 424 µm

Difflugia claviformis (Penard, 1902)

Diagnosis: test pyriform, compressed, with a distinct aboral protuberance, colorless, composed of small to large pieces of quartz; pseudostome surrounded by small particles.

Dimensions: Penard (1902) 380-450 µm; my measurements: 380-434 µm.

Ecology: In sediments of ditches.

Remarks: Shells of Difflugia claviformis seem to be rare. I found this species only in the sediment of a ditch in the nature reserve Naardermeer in the Netherlands. I am not convinced that this is a separate species. I always found it together with specimens of Difflugia nodosa. Probably both species are identical. Further records are necessary.

Difflugia claviformis
Tests 412 and 403 µm high; Naardemeer, Netherlands.

I’m not convinced that the species below belong to D. claviformis.

Difflugia claviformis
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 from every shell I’ve seen before. One shell was symmetrical and the other asymmetrical.
Difflugia claviformis
Difflugia claviformis
Pseudostome and neck
Difflugia claviformis
Difflugia claviformis
The same Difflugia compared with some other species in the same sample from Lolo Pass, 98-461 µm.
Difflugia claviformis
Recent posts

Spiculophrys

Genus Spiculophrys Zlatogursky, 2016 Diagnosis: Centrohelids lacking silica scales but with numerous thin, pointed organic (without any traces of silica) scales tapering towards acute apices. 18S

Read More »

Acanthocystis drakena

From Zlatogursky, 2016 Acanthocystis drakena Zlatogursky, 2016 Diagnosis: Cells are 21.1-30.5 µm (ca. 26.7) in diameter. Cell is covered with oval plate-scales having a margin

Read More »

Choanocystis symna

From Zlatogursky, 2014 Choanocystis symna Zlatogursky, 2014 Diagnosis: Cell body ca. 6.7 µm in diameter. Axopodia three–five times longer than a cell diameter. Plate-scales dumbbell-shaped

Read More »

Acanthocystis costata

From Zlatogursky, 2014 Acanthocystis costata Zlatogursky, 2014 Diagnosis: Cell body ca 9.5 µm in diameter. Axopodia 2–3 times longer than cell diameter. Length of spine-scales

Read More »

Kinetocyst

Left: ultra-structure of a kinetocyst of Raphidiophrys contractilis); right: two kinetocysts in an axopodium. Kinetocysts In centrohelid heliozoa, extrusomes are called kinetocysts, and are present

Read More »

Yogsothoth carteri

Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;

Read More »