Tubothalamea

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Class Tubothalamea Pawlowski, Holzmann & Tyszka 2013

Diagnosis: Bi- or multi-chambered test with tubular chambers at least in the juvenile stage; wall agglutinated or calcareous; in ancestral forms the test is composed of a spherical proloculus followed by a spirally enrolled tubular chamber; more evolved forms have multi-chambered tests;

Molecular characteristics: relatively short SSU rRNA gene (2289–2866 nt) and very low GC content (< 30%).

Stratigraphic range: Lower Cambrian – Recent.

  • Order Miliolida (Delage and Hérouard, 1896) emend

Test bi- or multi-chambered, chambers tubular or elongate, some with complex internal structures adapted to host algal endosymbionts; wall generally imperforate, calcareous of high magnesium calcite with randomly oriented crystals refracting light in all directions and resulting in a porcelaneous appearance of the test; may be agglutinated or siliceous in some taxa (Miliammina, Miliammellus).

Test composed of proloculus followed by an enrolled tubular chamber, aperture terminal; wall of low magnesium calcite, optically a single crystal in Spirillinidae and Patellinidae; wall agglutinated in Ammodiscidae.



Source: Pawlowski J., Holzmann M., Tyszka J., 2013. New supraordinal classification of Foraminifera: Molecules meet morphology. Marine Micropaleontology, available online 17 April 2013, http://dx.doi.org/10.1016/j.marmicro.2013.04.002