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Popular pages
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Microworld – world of amoeboid organisms
An interesting group of testate amoebae is the genus Difflugia. There have been described hundreds of species, but the question is: how many of them are true species? Most descriptions are inaccurate...
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Arcella – Microworld
Arcella Ehrenberg, 1832 Diagnosis: Test more or less circular with a central invaginated opening, surrounded by a collar in many species. Test completely organic, composed of box-like building units ...
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Arcella gibbosa – Microworld
Arcella gibbosa Penard, 1890 Diagnosis: Shell colorless, yellow or brown, circular in dorsal view and domed or hemispherical in lateral view, with an enlargement at the basis (the keel or basal borde...
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Arcella vulgaris – Microworld
Arcella vulgaris Ehrenberg, 1830 Diagnosis: Shell hemispherical, helmet-shaped, with a distinct basal edge; height of the shell about one-half the diameter. Surface smooth; aperture invaginated, circ...
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Arcella brasiliensis – Microworld
Arcella brasiliensis Cunha, 1913 Diagnosis: Shell circular in apertural view, hemispherical in lateral view, with a distinct marginal rim. Dorsal surface provided with depressions, promoting an undul...
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Arcella gandalfi – Microworld
Arcella gandalfi Féres, Porfírio-Sousa, Ribeiro, Rocha, Sterza, Souza, Soares and Lahr, 2016 Diagnosis: Shell hemispherical with an apical cone in lateral view. The top of this conical extension is c...