Spirillinida

Spirillinida
Systematics
without rank:	Sar
without rank:	Rhizaria
without rank:	Retaria
without rank:	Foraminifera (Foraminifera)
without rank:	Tubothalamea
Order :	Spirillinida
Scientific name
	Spirillinida
	Hohenegger & Piller , 1975

The Spirillinida are an order of shell-bearing, marine unicellular organisms from the group of foraminifera .

features

The species of the order secrete their housing made of low magnesium calcite (<5 mol% magnesium ), which is composed of individual, few or a mosaic of crystals . The housings are perforated or imperforate, planispiral to highly trochospiral and multi-chambered. The first chamber, the proloculus , is spherical, the second tubular and either un- or few-chambered. The individual chambers are sometimes further subdivided.

Systematics

The order has been documented by fossils since the Upper Triassic . It contains two families , but there is no superfamily.

proof

Barun K. Sen Gupta: Systematics of modern Foraminifera , In: Barun K. Sen Gupta (Ed.): Modern Foraminifera . Springer Netherlands (Kluwer Academic), 2002, ISBN 978-1-4020-0598-5 , pp. 27 .
Alfred R. Loeblich, Jr., Helen Tappan: Foraminiferal genera and their classification , E-Book des Geological Survey Of Iran , 2005, Online