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Leptophrys vorax
Leptophrys vorax, 95 µm, characteristic locomotion

Family Leptophryidae Hess, Sausen et Melkonian, 2012

Diagnosis: Limnetic or terrestrial Vampyrellida; predominantly exhibiting the expanded morphotype. Cells spreading on surfaces in the trophic phase, continuously changing their outline and therefore extremely variable in size and shape (e.g. irregular branched, elongate, anastomosing, network-forming). Pseudopodia thin, tapering, occasionally ensiform; sometimes branching or dendritic; often emerging from hyaloplasmatic fringes at the cell margins; sometimes in tufts. Cells move by incessant creeping. Food items are engulfed as a whole (e.g. unicellular or colonial algae, fragments of algal filaments, fungal spores, yeast cells and small metazoans) or opened by local perforation of the cell wall (e.g. fungal conidia by Platyreta germanica). Color of granuloplasm varies with food source; colorless or pale, algivorous members occasionally show yellowish, brownish or orange tint. Size and shape of digestive cysts depend on the food source; cysts sometimes resembling the outline of the prey. Outer, delicate cyst envelope known for Vampyrellidae emend. not observed.

Type genus. Leptophrys

Other genera included: Theratromyxa, Platyreta

Leptophrys vorax
Here the cell moves both to the right and to the left, getting longer and longer, but eventually the right side dominates and the opposite side is pulled out.
Leptophrys vorax
Expanded form, body about 160 µm; notice the anchor points where hyaloplasm is attached to the slide.
Leptophrys vorax
Leptophrys vorax, small form; the white arrow shows the direction of locomotion, the black arrow points to an anchorpoint.
Leptophrys vorax
The same specimen as above. The arrow shows the direction of locomotion.
Leptophrys vorax
Notice the small granules at the edge of hyaloplasm and body.
Leptophrys vorax
Leptophrys sp.: cytoplasmic granules, possibly a kind of membranosomes as in Vampyrella.
Leptophrys vorax
Leptophrys sp. with food (Scenedesmus).
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