Microworld

world of amoeboid organisms

Menu

Genus Netzelia Ogden, 1979

Diagnosis: shell ovoid, circular in cross-section; aperture lobed with a thick organic rim or necklace, made of small idiosomes (homemade siliceous elements). Netzelia differs from Difflugia in its ability to build its test completely from idiosomes  with sometimes foreign material (xenosomes) like mineral grains and diatom frustules.

One main shell character which distinguishes Netzelia from Difflugia are the embedded idiosomes which often have a characteristic ‘nail’ shape. The proportion of these elements in the shell matrix is dependent, in part, on the availability of other siliceous material, however, they can construct a complete casing composed of just these elements.The dimensions of the ‘nails’ may vary, although such variation is usually limited to the length of the shaft of the nail, not the diameter of the head (Ogden and Meisterfeld, 1989).

Netzelia oviformis
Position of Netzelia – From Gomaa et al., 2017
Recent posts

Euglypha bryophila

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

Read More »

Vernalophrys

(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

Read More »

Actinosphaeridium spec.

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

Read More »

Euglyphidion

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

Read More »

Leptomyxa spec.

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

Read More »

Zivkovicia spec.

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

Read More »