Testate amoeba darkfield photomicrograph
The Rhizaria are a species-rich supergroup of mostly unicellular eukaryotes. A multicellular form has recently been described. This supergroup was proposed by Cavalier-Smith in 2002. They vary considerably in form, but for the most part they are amoeboids with filose, reticulose, or microtubule-supported pseudopods. Many produce shells or skeletons, which may be quite complex in structure, and these make up the vast majority of protozoan fossils. Nearly all have mitochondria with tubular cristae. Testate amoebae (thecamoebians, or Testacea) is a polyphyletic group of ameboid protists characterized by the presence of a test. Testate amoebae mainly include the euglyphids (Rhizaria, Cercozoa, Euglyphida) and the arcellinids (Amoebozoa, Arcellinida). Testate amoebae taxa are differentiated by their test characteristics and the type of pseudopodia (lobose, recticulose, or filose). Arcellinid testate amoebae produce lobose (wide) pseudopodia while euglyphid testate amoebae produce filose (slender) pseudopods
Size: 4223px × 3363px
Photo credit: © Scenics & Science / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: amoeba, darkfield, micrograph, microscope, photomicrograph, pond, pseudopodia, shell, testate
