Longitudinal division of a naked Frenzelina cell

December 16 I had several specimens of a large naked Frenzelina species in a wet mount which I had kept for over two weeks in de moisture chamber. I could observe a division of one specimen, at least the last part of it. It’s a longitudinal division, which means that the division starts at the “dorsal” side and ends with the division of the mouth or pseudostome.

14:14:55
Beginning of observation; one of two nuclei is visible; there is one pseudostome.
14:19:46
The “isthmus” between both cells gets smaller.
14:20:14
One thick lobopodium is present and one pseudostome.
14:24:37
Each cell develops its own pseudostome. It’s not clear how the original pseudostome splits into two new ones.
14:26:21
The arrow points to the collar of the new pseudostome.
14:30:05
Cells move farther away from each other.
14:32:53
Both cells are separated.
Recent posts

Difflugia ampla

Difflugia ampla, after Rampi, 1950 (l) and Gauthier-Lièvre et Thomas, 1958 (r) Difflugia ampla Rampi, 1950 Diagnosis: Test broadly pyriform, with a wide and rounded

Read More »

Difflugia parva

Difflugia parva, from Gauthier-Lièvre et Thomas, 1958 Difflugia parva  (Thomas, 1954) Ogden, 1983 = Difflugia oblonga var. parva Thomas, 1954 Diagnosis: Test pyriform, tapering evenly from

Read More »