world of amoeboid organisms

Planhoogenraadia acuta
P. acuta – from Bonnet, 1977

Planhoogenraadia acuta Bonnet, 1977

Diagnosis: Test colorless, with a cryptostome and flat ventral side. In dorsal view, the test has a navicular shape with rounded anterior and pointed posterior end. In side view, the test shows a strongly curved visor with deep indentations. A thick ventral lip folds quite deep into the interior of the test. In the sagittal plane, its border reaches half of the dorso-ventral distance. Test in diameter roughly circular. In ventral view, the semicircular aperture is almost completely hidden by the visor. The edge of the visor has a regular curvature, with concavity turned towards the rear of the test. The wall of the test is very thin, except at the level of the ventral lip. The test is covered with amorphous silicious plates of medium size.

Dimensions: Length 90-96 µm; width 40 µm; diameter 40 µm.

Ecology: Humic forest soil, Amazon (Venezuela).


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  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 »