Granofilosean Unknown 4

I found this amoeboid several times in a freshwater pond (Crailoo, the Netherlands). The cell is small, about 10 µm in diameter, with 3-6 granulopodia, extending from one side of the cell, thus resembling a comet. The granulopodia are retractive. When disturbed by a passing protist, they can retract extremely fast, just like some helizoans do. After a short time, the granulopodia stretch again. All observed specimens (n=4) were surrounded by debris.

Stretched granulopodia

Retracted granulopodia

Recollected in 2020

Ferry Siemensma
Created March 2, 2019
Last updated February 01, 2021

Euglypha bryophila

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Euglypha bryophila, after Brown, 1911 (L), from Ecuador (R) Euglypha bryophila Brown, 1911 Diagnosis: (Original description) The test is very regular in form and subject

Vernalophrys

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(A) A Scenedesmus cell (arrow) is engulfed by a trophozoite. (B) Several Scenedesmus cells adhere to the surface of a plasmodium that has numerous vacuoles

Actinosphaeridium spec.

February 24, 2021

Actinosphaeridium spec. Diagnosis: Cell surrounded by a membranous shell, with an outer mucous layer. Filopodia with granules, sometimes branching. Cell stalked. Ecology: I found this

Euglyphidion

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Euglyphidion enigmaticum – after Bonnet, 1960 Genus Euglyphidion Bonnet, 196 Diagnosis: Shell hyaline, ovoid, pseudostome circular or slightly elliptical. Shell loosely covered with two types of

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February 16, 2021

Leptomyxa sp., slowly retracting in response to the light of the microscope Leptomyxa sp. Diagnose: This is a very large amoeba which I found in

Zivkovicia spec.

February 15, 2021

Zivkovicia spec., 200 µm long; the right image is viewed through the aperture Zivkovicia spec. Diagnosis: Shell pyriform, circular in oral view, with a clear

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