Difflugina

Lesquereusia (le-square-oise-ee-a) spiralis, thelorica of which is built up by a meshwork of short curved transparent rods. These two specimens have just finished dividing and are still connected with their apertures. The individual with the dark coloured shell is the parent cell. The dark colour is caused by deposited metal ions. This specimen was collected in a freshwater pond near Konstanz, Germany. Differencial interference contrast.

Lesquereusia spiralis (Ehrenberg, 1880) Ventral view of this testate amoebae cultured and isolated by Erika Barbero as part of the ATOL project. Image by D. Lahr and S. Murray.

Lesquereusia spiralis (Ehrenberg, 1880) Detail of test structure. This testate amoebae was cultured and isolated as part of the ATOL project by Erika Barbero. Image by D. Lahr and S. Murray.

Lesquereusia spiralis (Ehrenberg, 1880) Detail of organic cement matrix. This testate amoebae was cultured and isolated by Erika Barbero as part of the ATOL project. Image by Dan Lahr and Shauna Murray.

This testate amoeba isolated and cultured by E. Barbero. Image by D. Lahr and E. Barbero.

Quadrulella (quad-roo-lell-a) is a testate amoeba in which the lorica incorporates square plates. Differential interference contrast.

Quadrulella (quad-roo-lell-a) is a testate amoeba. The pyriform shell is composed of quadrangular, non-overlaping siliceous scales. Each scale measures on average 7 X 7 microns. This specimen was collected in a freshwater pond near Konstanz, Germany. Differential interference contrast.

Quadrulella (quad-roo-lell-a) is a testate amoeba. The pyriform shell is composed of quadrangular, non-overlaping siliceous scales. Each scale measures on average 7 X 7 microns. The shell of this dead specimen is filled with transparent quadrangular siliceous scales, built by the cell in his or her lifetime. Differential interference contrast.

Portrait of Hyalosphenia. Amoebae of this genus are characterized by homogeneous proteinaceous tests that are smooth and compressed. Epipodia connect the cell body to the interior of the test. Test may have yellowish tinge. With SEM two tiny lateral pores are seen at the widest part of the test. Distinguishable from the relatively smooth Nebela carinata and N. flabellulum by the absence of lateral ridge and greater length than width respectively. From freshwater pond near Boise, Idaho. Phase contrast.

Hyalosphenia, side of of the compressed test of this amoeba. Oblique illumination.

Portrait of Hyalosphenia. Amoebae of this genus are characterized by homogeneous proteinaceous tests that are smooth and compressed. Epipodia connect the cell body to the interior of the test. Test may have yellowish tinge. With SEM two tiny lateral pores are seen at the widest part of the test. Distinguishable from the relatively smooth Nebella carinata and N. flabellulum by the absence of lateral ridge and greater length than width respectively. From freshwater pond near Boise, Idaho. Oblique illumination.

Flattened testate amoeba, cytoplasm atrtaches to the inside of the test.

Two images at different focal levels of this species of Nebela isolated from Cedar Swamp near Woods Hole, Massachusetts in October 2005 by Hwan Su Yoon and imaged by him.