Milioloidea is one of five superfamilies belonging to the
Miliolida
The Miliolida are an order of foraminifera with calcareous, porcelacous tests that are imperforate and commonly have a pseudochitinous lining. Tests are composed of randomly oriented calcite needles that have a high proportion of magnesium along ...
, (suborder Miliolina in
Loeblich &
Tappan 1988).
Milioloideans produce a coiled test, commonly with two, less frequently three or more, chambers per whorl arranged in varying planes about the longitudinal axis, which later may become involute or uncoil. Advanced forms may have secondary partitions within the chambers.
Species within the Milioloidea are found in Upper Triassic (
Norian
The Norian is a division of the Triassic geological period, Period. It has the rank of an age (geology), age (geochronology) or stage (stratigraphy), stage (chronostratigraphy). It lasted from ~227.3 to Mya (unit), million years ago. It was prec ...
) to recent marine sediments.
References
Further reading
*
*
* Alfred R. Loeblich Jr and Helen Tappan, 1988. Forminiferal Genera and their Classification
*
External links
Miliolacea on www.itis.gov
Valeria I. Mikhalevich et al.
Tubothalamea
Foraminifera superfamilies
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