Globigerinida
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Globigerinida

Globigerinina
Temporal range: M Jurassic - Recent
Globigerina.svg
Scientific classification e
Clade: SAR
Phylum: Foraminifera
Class: Globothalamea
Order: Rotaliida
Suborder: Globigerinina
Delage & Hérouard, 1896
Superfamilies

The Globigerinina is a suborder of foraminiferans that are found as marine plankton. They produce hyaline calcareous tests, and are known as fossils from the Jurassic period onwards. The group has included more than 100 genera and over 400 species, of which about 30 species are extant. One of the most important genera is Globigerina; vast areas of the ocean floor are covered with Globigerina ooze (named by Murray and Renard in 1873), dominated by the shells of planktonic forms.

Description

Globigerinids are characterized by distinctly perforate planispiral or trochospiral tests composed of lamellar radial hyaline (glassy) calcite, with typically globular chambers and single interiomarginal aperture. Some however have multiple or auxiliary apertures, and in some the aperture is areal or terminal in location. Some, also, have keels, reinforcing thickenings along exterior angles. An adaptation to the planktonic habit is the development of long narrow spines that support a frothy buoyant ectoplasm.

Superfamilies and families

The Globigerinina are now divided into these superfamilies and families:[1]

References

  1. ^ Rotaliida, World Foraminifera Database, accessed 27 November 2018

External links



  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

Globigerinida
 



 



 
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