world of amoeboid organisms

Menu
renzelina reniformis
renzelina reniformis
Frenzelina reniformis, at two diffferent levels

Frenzelina reniformis Penard, 1902

Diagnosis: test membranous, semi-hemispherical or hemispherical, usually with an open ventral face; very small mineral grains, loosely attached to the membrane; test in dorsal view usually elliptical; test not always present; plasmabody broad-elliptical or kidney-shaped; aperture flexible, commonly a short small tube; numerous fine filopodia, often in a bundle; nucleus vesicular with one central nucleolus.

Dimensions: 26-30 µm (Penard); my measurements: shell 18-33 µm.

Ecology: fresh water, in ditches and lakes, between sphagnum and debris. Very common.

Remarks: Naked specimens closely resemble Lecythium-species, which also have a flexible aperture. Naked cells can have a thick layer of mucous to which small particles adhere.

Frenzelina reniformis - Ferry Siemensma
Empty shell, c. 33 µm
Frenzelina reniformis
Drawing: from Penard (1902)
renzelina reniformis
Filopodial network
renzelina reniformis
renzelina reniformis
Two cells from the same location
Frenzelina reniformis
renzelina reniformis
Frenzelina reniformis, just like Penards drawing above (l) and cell attached to the cover glass (r)
Frenzelina reniformis
Frenzelina reniformis
Dividing specimen, without test; kidney-shaped specimen without test
Frenzelina reniformis
Frenzelina reniformis
Small cylindrical aperture and bundle of filopodia
Frenzelina reniformis
Frenzelina reniformis
Pseudostomal view; lateral view
Frenzelina reniformis
Frenzelina reniformis
Cells about 24 µm, almost naked. Both cells from the same wet mount.
Frenzelina reniformis
Frenzelina reniformis, with filopodia, cell c. 28 µm.
Shell almost a complete sphere, with small pseudostome
Frenzelina reniformis
Frenzelina reniformis
The same specimen, changing its aperture within one minute.
Frenzelina reniformis
Frenzelina reniformis naked form
renzelina reniformis
Frenzelina reniformis
Frenzelina reniformis, nucleus visible
Frenzelina reniformis
Naked specimen
Frenzelina reniformis
Two naked specimens from the same wet-mount-culture. Notice the difference in size.
Frenzelina reniformis
Frenzelina reniformis, 26 µm
Frenzelina reniformis
Frenzelina reniformis, with small tubular pseudostome; body 22 µm
Recent posts

Quadrulella scutellata

Quadrulella scutellata, after Wailes, 1912 Quadrulella scutellata  Wailes, 1912 Diagnosis: Test moderately large, hyaline, pyriform, compressed; composed of small siliceous, rectangular plates arranged in irregular

Read More »

Mrabella plicata

M. plicata, after Hoogenraad and De Groot, 1940 Mrabella plicata (Hoogenraad and De Groot, 1940) Diagnosis: Test made of small square plates, between which some

Read More »

Quadrulella alata

Q. alata, after Gauthier-Lièvre, 1957 Quadrulella alata  Gauthier-Lièvre, 1957 Diagnosis: In frontal view, the test is lageniform, with a broadly rounded fundus (subcircular or ovoid)

Read More »

Quadrulella acuminata

Quadrulella acuminata, after Van Oye, 1958 Quadrulella acuminata  Van Oye, 1958 Diagnosis: Test rather pyriform with a stretched base with converging sides, very slightly concave

Read More »