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Gromia from Schiermonnikoog
“Gromia” from Schiermonnikoog

cf Gromia spec.

Diagnosis: Amoeboid with membranous theca, covered with some agglutinated material; cells ovoid or pyriform, smaller cells oblong. Cytoplasm vacuolated, with large vacuoles, pressed against each other. Many food particles present. One relatively small nucleus with a broad peripheral band of nucleoli. Pseudostome trumpet- or funnel-shaped. Filopodia with rapid bidirectional streaming of small granules, anastomizing but without building a reticulum as known from foraminifera.

Dimensions: cell 120-238 µm (n=4); nucleus

Ecology: Only known from brackish water on the Dutch island Schiermonnikoog. Observed food: diatoms and algae.

Remarks: The taxonomic position of this species is not clear. The structure of the granulopodia resembles that of Arachnula and Leptogromia.

Gromia from Schiermonnikoog
P = pseudostome
Gromia from Schiermonnikoog
Small specimen, with pronounced pseudostome
Gromia from Schiermonnikoog
Arrow points to the edge of the trumpet-shaped pseudostome
Gromia from Schiermonnikoog
Arrow points to the edge of the trumpet-shaped pseudostome
Gromia from Schiermonnikoog
Notice the vacuolated cytoplasm.
Gromia from Schiermonnikoog
Pseudostome with concentric rings
Gromia from Schiermonnikoog
Nucleus between the arrows
Gromia from Schiermonnikoog
P = pseudostome, v = vacuoles
Gromia from Schiermonnikoog
The arrow points to the edge of the trumpet-shaped pseudostome
Gromia from Schiermonnikoog
Ovoid shape
Gromia from Schiermonnikoog
Gromia from Schiermonnikoog
“Gromia” from Schiermonnikoog
Gromia from Schiermonnikoog
Granulopodia
Gromia from Schiermonnikoog
Granulopodia
Gromia from Schiermonnikoog
“Gromia” from Schiermonnikoog
Gromia from Schiermonnikoog
Pseudostome with concentric rings
Gromia from Schiermonnikoog
Gromia from Schiermonnikoog
Gromia from Schiermonnikoog
Notice the vacuolated cytoplasm
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