Chilostomellacea
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| Chilostomellacea Temporal range: L Cretaceous (Barremian)- Recent | |
|---|---|
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Rhizaria |
| Superphylum: | Retaria |
| Phylum: | Foraminifera |
| Order: | Rotaliida |
| Superfamily: | Chilostomellacea Brady, 1881 |
| Families | |
|
See text | |
The Chilostomellacea constitutes 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; 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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