Microworld

world of amoeboid organisms

Menu

Genus Luffisphaera  Belcher & Swale, 1975

Diagnoses: Cells spherical or elliptical, size range ca. 2.5-3.5 µm. Periplast covered with a single layer of hollow, lattice-work scales. The majority of these consist of a bowl-shaped lower part with a thickened base supporting a cylindrical, fusiform or dome-shaped outer portion. Some scales possess the basal part only. No cilia or basal bodies observed. Single large nucleus present.

Remarks: The nucleus occupies a large part of the cell. It has a conspicuous nucleolus and the double membrane of the wall is clearly visible. The mitochondria, several in each cell, contain microtubular cristae, and a Golgi apparatus and associated vesicles are always present. The cytoplasm contains numerous vesicles and channels of e.r. Several vacuoles which may be food vacuoles are also present, but no recog­nizable contents were seen. The cell membrane is often invaginated to form small channels, perhaps in connection with pinocytosis. There was no indication of either cilia or basal bodies.

The affinities of the organisms are obscure. They might be thought to be spores, but there are no signs of encapsulation and the content’s seem typical of active cells. Despite the apparent absence of cilia there is no evidence of pseudopodial production and the cells are presumably non-motile. Recent studies have shown a great diversity of scale structure among micro-organisms, but the only scales in the least resembling those of Luffisphaera are on Sphaleromantis tetragona Skuja (Manton & Harris 1966), a motile photosynthetic member of the Chrysophyceae or Chrysomonadida, Species of Luffisphaera may be widespread. They are not confined to freshwater since a cell apparently belonging to the group (and most like our form A) has been seen among the marine plankton off the Danish coast (Manton, in the press).

All from Belcher and Swale, 1975

Luffisphaera
a L. cucumiformis; b L. myosurus; c L. ampullacea; d L. lanceolata (from Belcher & Swale, 1975)
Recent posts

Actinosphaeridium spec.

Actinosphaeridium spec. Actinosphaeridium spec. Diagnosis: Cell surrounded by a kind of membranous shell. Filopodia with granules, sometimes branching. Cell not stalked, at least not observed.

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 »

Pontigulasia pentangulostoma

P. pentangulostoma, after Quin et al., 2008 Pontigulasia pentangulostoma Quin et al., 2008 Diagnosis: Shell is brown, laterally uncompressed, parted to neck and body regions

Read More »

Flabellula citata

Flabellula citata, from Dykova et al., 2008 Flabellula citata Schaeffer, 1926 Diagnosis: Length in locomotion 15-75 µm; width 25-55 µm. Shape very variable, from a

Read More »