Cochliopodium maeoticum Kudryavtsev, 2006

Diagnosis: Length in locomotion, 12-22 µm (average 17 µm), breadth, 18-32 µm (average 22 µm), length : breadth ratio, 0.54-0.91 (average 0.75). Oval or fan-shaped, with uneven frontal and lateral margins of the hyaloplasm, sometimes with few subpseudopodia. Trailing filaments often present at the posterior margin. Spherical vesicular nucleus, 2-4 µm in diameter (average 3.5 µm), with central nucleolus, 1.5-3 µm in diameter (average 2 µm). Scales consist of a disc-like base plate, 0.8-0.9 µm in diameter, made up by fine rings, a central column of 5 stalks and a complex apical part consisting of 5 spokes which form a basket-like structure and a fine networked disc 0.6-0.7 µm in diameter. From the base of the apical part a tubular cross-striated spine about 50 nm in thickness and 1.5 µm in length arises; each spoke is connected to the spine with a fine filament. Height of the scale 0.5-0.6 µm.

Observed habitat: Gulf of Taganrog (the Azov Sea, southern Russia), bottom sediments, salinity about 2.5%.

Remarks: Differs from species with structurally similar scales, C. spiniferum, C. kieliense, and Cochliopodium sp. 3 (Bark 1973), in the proportions of a scale, the structure of the apical part and the base plate. Locomotive form similar to that of C. minutoidum, but differs from this species in scale structure (5-, not 4-rayed symmetry of the scale, different structure of base plate and apical part, presence of a spine).

Recent posts

Difflugia australis

D. australis after Playfair, 1917 Difflugia australis (Playfair, 1917) Gauthier-Lièvre et Thomas, 1958 Syn.: Difflugia bacillariarum var. australis Playfair 1917 Diagnosis: Test broadly ovate, with

Read More »

Difflugia baradlana

D. baradlana after Varga, 1963 Difflugia baradlana Varga, 1963 Diagnosis: Test ovoid with a very small neck which is about 1/4 of the test length.

Read More »

Difflugia angelica

D. angelica after Gauthier-Lièvre et Thomas, 1960 Difflugia angelica Gauthier-Lièvre et Thomas, 1960 Diagnosis: Test spherical, slightly mammillated. Pseudostome regularly lobed like a star with

Read More »

Difflugia algaephila

D. algaephila after Decloitre, 1977 (l) and Chardez (1980) Difflugia algaephila Decloitre, 1977 Diagnosis: Test ovoid, neatly pointed, with oblique round pseudostome. Dimensions: Length 73-75

Read More »

Difflugia key spherical

Spherical tests Tests that are more or less spherical, some with a collar, but all without spines or other outgrowths. The aperture or pseudostome is

Read More »

Difflugia key compressed

Compressed tests Compressed tests are more or less oval or elliptical in cross-section. The aperture is round or oval or even lobed. This group has no

Read More »