world of amoeboid organisms

Menu
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).
Recent posts

Spiculophrys

Genus Spiculophrys Zlatogursky, 2016 Diagnosis: Centrohelids lacking silica scales but with numerous thin, pointed organic (without any traces of silica) scales tapering towards acute apices. 18S

Read More »

Acanthocystis drakena

From Zlatogursky, 2016 Acanthocystis drakena Zlatogursky, 2016 Diagnosis: Cells are 21.1-30.5 µm (ca. 26.7) in diameter. Cell is covered with oval plate-scales having a margin

Read More »

Choanocystis symna

From Zlatogursky, 2014 Choanocystis symna Zlatogursky, 2014 Diagnosis: Cell body ca. 6.7 µm in diameter. Axopodia three–five times longer than a cell diameter. Plate-scales dumbbell-shaped

Read More »

Acanthocystis costata

From Zlatogursky, 2014 Acanthocystis costata Zlatogursky, 2014 Diagnosis: Cell body ca 9.5 µm in diameter. Axopodia 2–3 times longer than cell diameter. Length of spine-scales

Read More »

Kinetocyst

Left: ultra-structure of a kinetocyst of Raphidiophrys contractilis); right: two kinetocysts in an axopodium. Kinetocysts In centrohelid heliozoa, extrusomes are called kinetocysts, and are present

Read More »

Yogsothoth carteri

Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;

Read More »