world of amoeboid organisms

Menu

Difflugia smilion Thomas, 1953

Diagnosis: shell bilateral symmetrical, cylindrical, gradually swelling from the aperture for about two-thirds of the body length to the broadest diameter and then tapering in the last third of the body length to a bluntly or sharply, asymmetrically shaped apex, which outline resembles in lateral view the dorsal fin of a shark. Test usually hyaline, composed of quartz particles and diatom frustules, giving it the appearance of a regular smooth surface. Aperture usually circular. Nucleus ovular, with nucleoli arranged close to the nuclear membrane.

Dimensions: Thomas: length 210-220 µm, aperture diameter 30-50 m;

Ecology: in oligotrophic and mesotrophic ponds, between sphagnum; rare.

Remarks: Dubious species. Similar in general shell shape with D. scalpellum but more slender and slightly smaller in size. The spine is slightly out of the axis. It shows some resemblance with the dorsal fin of a shark. The nucleus is hard to detect between all inclusions, but when the test is compressed, it can be observed.
This species also fits the description of D. curvicaulis in shell structure.

Difflugia scalpellum

 

You can label these shells as D. smilion, D. curvicaulis or as D. scalpellum. The drawing to the left is from Penard and shows D. scalpellum.
Difflugia scalpellum
Recent posts

Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »

Tracheleuglypha elongata

T. elongata, A-C after Thomas and Gauthier-Lièvre, 1959; D after Van Oye, 1959 Tracheleuglypha elongata Van Oye, 1959 Diagnosis: Test similar to T. dentata, but

Read More »

Tracheleuglypha acolla

T. acolla, after Bonnet and Thomas, 1960 Tracheleuglypha acolla Bonnet and Thomas, 1955 Diagnosis: Test ovoid, non compressed, round in cross-section, with large oval overlapping

Read More »

Cyclopyxis kahli oblonga

C. kahli f. oblonga , after Tarnogradskii, 1959 Cyclopyxis kahli f. oblonga  (Tarnogradskii, 1959) Centropyxis kahli f. oblonga Tarnogradskii, 1959 Diagnosis:  Test with all the

Read More »

Cyclopyxis leclercqi

Cyclopyxis leclercqi – from Beyens and Chardez, 1986 Cyclopyxis leclercqi Beyens and Chardez, 1986 Diagnosis: Shell circular in apertural view, dorso-ventrally compressed with a swollen

Read More »

Haplomyxa saranae

Haplomyxa saranae Dellinger, 2014 Diagnosis: cell body from small rounded (0.1 mm) to large elongated shape (up to 3.5 x 0.3 mm), usually flat but

Read More »