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Osangularia
Taxonomy
Osangularia was named by Brotzen (1940) [Sepkoski's age data: K Albi-m R]. It is extant. It was considered unknown by Brotzen (1940).
It was assigned to Alabaminidae by Brotzen (1940); and to Foraminiferida by Sepkoski (2002).
It was assigned to Alabaminidae by Brotzen (1940); and to Foraminiferida by Sepkoski (2002).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. Osangularia Brotzen 1940
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Brotzen 1940 | shell more or less lenticular, symmetrical, or one or the other side somewhat more strongly curved. Ran always sharpened or winged. Spiral side having several rapidly growing turns. The navel side shows only the last handling; often formed umbilical disc. The mouth consists of an angled hole (os angularis), one leg of which lies along the inner edge of the last chamber. The second runs more or less diagonally across the face of the last chamber. Often both legs are separated so that there are two mouths.
Stands between Eponides and Epistomina. Often in the Upper Cretaceous and in the older tertiary. The name Pulvinulinella should only be limited to forms corresponding to the genotype P. subperiviana. Spiral and umbilical side equally strongly arched. Spiral side with a particularly high centre and flat edge. The umbilical side is poorly structured, with an indistinct umbilical button or only a strongly raised centre. The edge was pulled out, particularly clearly marked from the navel side. Chambers indistinctly limited. Mouth surface steep; Mouth always in two parts. (Translated). |