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Biology of the Precambrian Genus Kakabekia: New Observations on Living Kakabekia barghoorniana
Abstract
Kakabekia barghoorniana Siegel, living species of a fossil genus Kakabekia, has now been cultured from Alaskan soil samples obtained from the Mendenhall Glacier near Juneau and from the Point Barrow region above the Arctic Circle. Morphological comparisons, especially of mantle variations, show that fossil and living populations overlap in many details. Cytochemical tests demonstrate that living Kakabekia has no storage forms of lipid or polysaccharide and no phenoloxidase. Some individuals (19-33%) contain heme enzymes but most do not; hence they cannot utilize O2 even in air.
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- Barghoorn ES, Tyler SA. Microorganisms from the Gunflint Chert: These structurally preserved Precambrian fossils from Ontario are the most ancient organisms known. Science. 1965 Feb 5;147(3658):563–575. [Abstract] [Google Scholar]
- Siegel SM, Giumarro C. On the culture of a microorganism similar to the precambrian microfossil kakabekia umbellata barghoorn in nh(3)-rich atmospheres. Proc Natl Acad Sci U S A. 1966 Feb;55(2):349–353. [Europe PMC free article] [Abstract] [Google Scholar]
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