Difference between revisions of "The oldest fossil foraminifera"
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(1999). 1. Holotype: arrow (a) points to a probable bud; arrow (b) may be a septum. 2. Paratype: arrow points to | (1999). 1. Holotype: arrow (a) points to a probable bud; arrow (b) may be a septum. 2. Paratype: arrow points to | ||
aperture. 3. Authors’ reconstruction (after [http://www.es.ucl.ac.uk/Grzybowski/ngen.pdf Kaminski 2004]) </font>]] | aperture. 3. Authors’ reconstruction (after [http://www.es.ucl.ac.uk/Grzybowski/ngen.pdf Kaminski 2004]) </font>]] | ||
| − | '''''Tithanoteka''''' Gaucher & Sprechmann 1999 is probably the oldest fossil foraminifera discovered in the Upper Vendian of Uruguay. Its test is "free, spheroidal to vase shaped, with walls composed of agglutinated rutile grains. The length of the | + | '''''Tithanoteka''''' Gaucher & Sprechmann 1999 is probably the oldest fossil foraminifera discovered in the Upper Vendian of Uruguay. Its [[SHELL|test]] is "free, spheroidal to vase shaped, with walls composed of agglutinated rutile grains. The length of the |
neck increased logarithmically with maximum diameter, the largest resembling long-necked bottles. Wall is single layer, with organic cement. The rutile grains are wellsorted, with grain size fine to medium silt. Grain size is dependent on maximum diameter, with the largest specimens containing the coarsest grains. Grains are arranged with their long axes parallel to the surface of the test, probably acting as spines. Apertural end open." (cited after Gaucher & Sprechmann 1999 from [http://www.es.ucl.ac.uk/Grzybowski/ngen.pdf Kaminski 2004]) | neck increased logarithmically with maximum diameter, the largest resembling long-necked bottles. Wall is single layer, with organic cement. The rutile grains are wellsorted, with grain size fine to medium silt. Grain size is dependent on maximum diameter, with the largest specimens containing the coarsest grains. Grains are arranged with their long axes parallel to the surface of the test, probably acting as spines. Apertural end open." (cited after Gaucher & Sprechmann 1999 from [http://www.es.ucl.ac.uk/Grzybowski/ngen.pdf Kaminski 2004]) | ||
