world of amoeboid organisms

Menu

Stratorugosa  Melton et Tekle, 2018

Diagnosis: Flattened flabellate amoebae forming lobate subpseudopodia. During locomotion, the uroidal part of the cell is dragged forward. Contains a perinuclear MTOC, and microtubules wrap around the nucleus.
Type species: Stratorugosa tubuloviscum

Stratorugosa tubuloviscum Melton et Tekle, 2018

Diagnosis: Cells rugose and sometimes striate. Cells broadly fan-shaped, triangular, to spatulate during locomotion. A knob-shaped or elongated uroid frequently present while moving. Cells changing direction bi- to tri-lobate. Lobose or finger-like subpseudopodia sometimes present at anterior or posterior positions. Average locomotive cell sizes 89.8 µm (range from 47.5 µm to 134.9 µm) in length and 72.6 µm (range from 34.7 µm to 122.1 µm) in width. Floating cells with many radiating pseudopodia up to 60 µm in length. Cells uninucleate (average: 10.6 µm; range: 8.5 µm to 13 µm; oval to round in shape) with a single, central and spherical to oval-shaped nucleolus under the light microscope (average 6.5 µm; range: 5.5 µm to 7.9 µm); the nucleolus was never fragmented in pieces. MTs fibrillar, organized in a prominent, perinuclear MTOC always juxtaposed directly behind the nucleus, wrapped around the nucleus, and never extend throughout the whole granuloplasm or into the hyaloplasm.

Type location: Exact type locality is unknown as this sample came from a freshwater Amoeba proteus Ward’s Scientific Culture.

Differential diagnosis: While this amoeba most closely resembles a slow moving, rugose Thecamoeba, it can be differentiated from Thecamoeba species by the presence of fibrillar MTs and an MTOC, its broad fan shape and anterior and posterior lobose or finger-like subpseudopodia during locomotion, and a peculiar locomotive mechanism with two sections, front and back (uroidal), of the cells moving in a pulling and piggy back movement, respectively.

Recent posts

Polychaos spec.

Polychaos spec. Polychaos spec. Diagnosis: Large amoeba with an irregular more or less polypodial shape during slow locomotion; uroid finely papillated, usually very large fasciculate

Read More »

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 »