Biology:Chilostomellacea

Chilostomellacea Temporal range: L Cretaceous (Barremian)- recent
Scientific classification
Domain:	Eukaryota
(unranked):	SAR
(unranked):	Rhizaria
Phylum:	Retaria
Subphylum:	Foraminifera
Order:	Rotaliida
Superfamily:	Chilostomellacea Brady, 1881
Families
See text

The Chilostomellacea constitute a superfamily of foraminifera within the order, Rotaliida.

The test, or shell, may be trochospiral to planisprial throughout, or just in the early part with the later part uncoiled. Chambers may be somewhat enveloping, and attached forms may uncoil in the adult. In coiled forms, the aperture is interiomarginal, or terminal in uncoiled forms. The test wall is of perforate hyaline (glassy) oblique calcite, appearing optically granular. The group as a whole has its beginning in the Early Cretaceous and continues into the present.

Subtaxa

Eleven families are included in the Chilostomellacea. Six extend into present, five do not come as far.

--Families alive today--

Chilomellidae

Gavelinellidae

Karreriidae

Oridorsalidae

Osangulariidae

Quadrimorphinidae

—Families not reaching the present--

Alabaminidae

Coleitidae

Globorotalitidae

Heterolepidae

Trichohyalidae

References

• Forminiferal Genera and Their Classification, Alfred R. Loeblich Jr and Helen Tappan, 1988. (e-book)
• Modern foraminifera. Barun K. Sen Gupta 2002; incl. Systematics of modern foraminifera, Loeblich and Tappan 1992

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Wikidata ☰ Q5099181 entry