Microworld

world of amoeboid organisms

Menu

Eiffelospina bifurcata

After Thomsen, 1978

Eiffelospina bifurcata (Thomsen, 1978) Cavalier-Smith, 2012

basionym Pinaciophora bifurcata Thomsen (1978)
(synonym Rabdiophrys bifurcata Roijackers and Siemensma, 1988)

Diagnosis: Periplast c. 20 X 12 µm when flattened, covered with scales of two kinds. Details of protoplast unknown. Plate-scales circular, 2.0-2.5 µm in diameter. A small number of differently sized larger perforations penetrate the distal plate, mainly clustered around the center of the scales. The major part of the distal scale surface is occupied by hexagonally close-packed fine perforations. A narrow band along the scale edge is patternless. The lower scale plate – visible through the larger distal plate perforations – appears to be patternless. The two scale plates are fused peripherally, elsewhere connected by intercalary material appearing as black dots with some tendency towards a hexagonal arrangement. Spine-scale 2.5-3.0 µm long and 0.8-0.9 µm wide at the distal bifurcate end (0.6-0.7 µm wide proximally and c. 0.2 µm at the narrowest point). The spine-scales are flattened distally into a very conspicuous bifurcation (hence the specific epithet). The triangular area between the branches is the only non-perforated part of the whole spine-scale. Proximally a number of struts attach the spine proper to an oval base plate. Large holes appear between these struts.
Type location: Dybso Fjord (Denmark). Surface water sample.

Recent posts

Metaheleopera

M. ovalistoma – after Bartos, 1963 Metaheleopera  Bartos, 1963 Diagnosis: Shell clearly narrowing towards the pseudostome, which can be seen even more clearly on the narrower sides

Read More »

Matsakision radixicola

M. radixicola – after Chardez, 1974 Matsakision radixicola  Chardez, 1974 Diagnosis: Shell ovoid, slightly compressed, transparent; pseudostome oval, truncated perpendicularly, with a slight neck. Shell

Read More »

Matsakision cassagnaui

M. cassagnaui – after Bonnet, 1967 Matsakision cassagnaui  Bonnet, 1967 Diagnosis: Shell hyaline, elongated ovoid, very little compressed, truncated perpendicularly or very slightly obliquely in

Read More »

Matsakision

Matsakision – after Bonnet, 1967 Matsakision   Bonnet, 1967 Diagnosis: Shell hyaline, elongated ovoid, very little compressed, truncated perpendicularly or very slightly obliquely in the region

Read More »

Arcella marginata

Arcella marginata, after Deflandre, 1929 Arcella marginata Daday, 1905 Diagnosis: Shell roughly hemispherical, rather overhanging, with a flattened, smooth edge. In dorsal view showing a

Read More »

Arcella lobostoma

Arcella lobostoma, after Deflandre, 1929 Arcella lobostoma Deflandre, 1929 Diagnosis: Shell hemispherical. In ventral view, irregular circular outline, often a little elliptical; pseudostome irregularly lobed:

Read More »