Microworld

world of amoeboid organisms

Menu
Rabdiaster reticulata
Rabdiaster reticulata
R. reticulata, (l.) from Siemensma (1991) and (r.) Nicholls (1902)

Rabdiaster reticulata (Thomsen, 1979) Mikrjukov, 1999. emend. Nicholls, 2012
( = Pinaciophora reticulata Thomsen, 1979)
( = Rabdiophrys reticulata (Thomsen, 1979) Roijackers & Siemensma, 1988)

Diagnosis: Cells 15 – 25 µm in diameter, with tubular spine-scales 2 – 6 µm long with a solid disc-like base 0.5 – 0.7 µm in diameter and about 0.1 µm thick. The middle region of the spine shaft with parallel walls in optical cross-section, about 0.35 µm in diameter; some spines with internal short, curved rib-like thickenings at irregular intervals throughout the length of the spine shaft. Distal end of the spine-scales flared to about 0.35 – 0.65 µm in diameter with a scalloped rim ornamented with 3-5 tooth-like projections. Plate-scales, 2.5 – 3.2 µm in diameter, comprised of a double layer of siliceous sheeting, unornamented or with a few small depressions in the distal sheet (visible in TEM images of obliquely oriented scales). The space between the double layer is filled with a maze-like pattern of ribs and/or hexagonal or polygonal meshes revealed in TEM images as electron-dense dark lines and forming an elaborate ribbed network  with the largest and more completely structured meshes located near the centre of the scale. Aberrant plate-scales  with non-circular outlines (smaller with rounded polygonal outlines) occasionally present.

Type location: Marine, Dybso Fjord (Denmark).

Rabdiaster reticulata
Rabdiaster reticulata
R. reticulata, from Nicholls (1902)
Recent posts

Velamentofex

Velamentofex tyrolensis Family Velamentofexidae Völcker and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to pyriform, usually surrounded by a broad layer of mucus-like

Read More »

Claparedellus lachmannii

Claparedellus lachmannii, common shape (Riedensee) Claparedellus lachmannii  Khanipour Roshan and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to elongated pyriform or irregularly shaped, with a

Read More »

Claparedellus

Claparedellus lachmannii Genus Claparedellus Khanipour Roshan and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to elongated pyriform or irregularly shaped, with a hyaline, flexible,

Read More »

Haplomyxa spec

Fig. 1: Main cell body of specimen A, partly hidden by debris Haplomyxa sp. Three specimens were observed in a Petri dish, along with two

Read More »

Edaphoallogromiidae

Edaphoallogromia australica Family Edaphoallogromiidae Siemensma, Holzmann, Apothéloz-Perret-Gentil, Clauß, Voelcker, Bettighofer, Khanipour Roshan, Walden, Dumack and Pawlowski, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera with a spherical

Read More »

Lachmanni spec.

“Lachmanni spec., body length 127 µm “Lachmanni” spec. I found two cells, size about 125 µm when ovoid, with an organic-walled membranous test and a

Read More »