Difflugia umbilicata

 

D. umbilicata, a frontal view, b lateral view (245 µm); c two tests from the same location, each 179 µm

 

Difflugia umbilicata Penard, 1902

= Difflugia pyriformis var. umbilicata Penard, 1902

Diagnosis: Shell elongated ovoid; fundus usually crowned by a bud-shaped ornament; shell composed of quartz particles, sometimes mixed with fragments of diatom shells; pseudostome circular.

Dimensions: Penard: length 200-275 µm; my measurements 179-245 µm.

Ecology: I found this species occasionally in sediment of a ditch in the nature reserve Naardermeer, the Netherlands.

Remarks:

 

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 »