micro*scope - version 6.0

Arcella, testate amoeba with brown organic lorica, central rounded aperture visible here. The amoeba is in. Differential interference contrast. This image was obtained by Feng Weisong, Gu Xiwen, Yang Jun and Miao Wei (of the Institute of Hydrobiology of the Chinese Academy of Sciences) and David Patterson in the summer of 2002. Image copyright: D. J. Patterson, image used under license to MBL (micro*scope).

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Arcella

From the collection Lake Donghu, China

Description of Arcella: Testate amoebae Species with a more or less circular shell, aperture central, invaginated, in many species surrounded by a tubus or a circle of pores. Test completely organic, composed of box-like building units arranged in a single layer and cemented together resulting in an areolar surface. Size of the building units varies between species. Young shells are colourless, older cells become brown due to iron and manganese storage into the building units. Most species are binucleate, but several species have more; A. megastoma may have up to 200. These nuclei are always vesicular. Several contractile vacuoles. Cell does not fill the test, fixed with small pseudopodia at the shell wall. Lobose pseudopodia emerge from the aperture. Cyst: round, within test. About 50 species and many more varieties and forms. Type species: A. vulgaris Ehrenberg, 1832. Deflandre (1928) in his monograph has subdivided this genus in four artificial sections and four derived groups on the basis of the height/diameter ratio, the presence of angular facets or a flat circular rim.

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Arcella in this collection

Arcella
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Arcella in other collections

Arcella gibbosa, from Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere	Arcella dentata, from Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere	Arcella arenaria, from Protozoan biomonitors in China	Arcella catinus, from Protozoan biomonitors in China	Arcella mitrata, from Protozoan biomonitors in China
Arcella gibbosa, from Protozoan biomonitors in China	Arcella hemisphaerica, from Protozoan biomonitors in China	Arcella megastoma, from Protozoan biomonitors in China	Arcella mitata, from Protozoan biomonitors in China	Arcella vulgaris, from Protozoan biomonitors in China
Arcella hemisphaerica, from ATOL protistology workshop 2005	Arcella gibbosa, from Quissett Pond	Arcella hemisphaerica, from Katz laboratory, cultures and isolates	Arcella hemisphaerica, from Katz laboratory, cultures and isolates	Arcella hemisphaerica, from Katz laboratory, cultures and isolates
Arcella, from Marconi Station	Arcella hemisphaerica, from Eutree - voucher materials	Arcella hemisphaerica, from Eutree - voucher materials	Arcella hemisphaerica, from Eutree - voucher materials	Arcella, from Protsville drawings of freshwater protists
Arcella gibbosa, from Limnic and marine Protists of Northern Germany and the Alps	Arcella discoides, from Limnic and marine Protists of Northern Germany and the Alps	Arcella gibbosa, from Limnic and marine Protists of Northern Germany and the Alps	Arcella gibbosa, from Limnic and marine Protists of Northern Germany and the Alps	Arcella crenulata, from Hawley Bog Project
Arcella, from Cumloden, Massachusetts, USA	Arcella vulgaris, from Lamont Pond, freshwater, New York	Arcella, from Protists from Sao Paulo, Brazil	Arcella, from Protists from Sao Paulo, Brazil	Arcella, from Protists from Sao Paulo, Brazil
Arcella, from Audley Bottom	Arcella vulgaris, from Lake Toolik, Arctic Alaska	Arcella vulgaris, from Cumloden, Massachusetts, USA	Arcella vulgaris, from Yellowstone National Park (Wyoming, USA)	Arcella bathystoma, from Cumloden, Massachusetts, USA
Arcella gibbosa, from Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere	Arcella gibbosa, from Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere	Arcella gibbosa, from Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere	Arcella, from Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere

micro*scope - version 6.0 - March, 2006
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