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

Ditrema spec.

Ditrema spec. Ditrema spec. Diagnosis: Shell as with D. longicollis, but much smaller, surrounded by V-shaped structures that gave it the impression of a star.

Read More »

Rotosphaerida

Pompholyxophrys Pompholyxophrys Pompholyxophrys Rabdiophrys Rotosphaerida Rainer, 1968 Diagnosis: Aciliate predominantly spherical or flattened amoebae from which elongated actin-based filopodia extend; with flat discoid mitochondrial cristae;

Read More »

Centropyxis tabel

Key to Centropyxis species 1 Test in dorsal view circular or almost circular 2 – Test in dorsal view irregular due to various outgrows and

Read More »