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Praeorbulina
Taxonomy
Praeorbulina was named by Olsson (1964) [Sepkoski's age data: T Mi-l-u T Mi-m]. It is not extant.
It was assigned to Globigerinidae by Olsson (1964), Gibson (1983); and to Foraminiferida by Sepkoski (2002).
It was assigned to Globigerinidae by Olsson (1964), Gibson (1983); and to Foraminiferida by Sepkoski (2002).
Species
Species lacking formal opinion data
Synonymy list
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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. †Praeorbulina Olsson 1964
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†Praeorbulina circularis Blow 1956
†Praeorbulina curva Blow 1956
†Praeorbulina glomerosa Blow 1956
†Praeorbulina glomerosadup Fraass et al. 2024
†Praeorbulina transitoria Blow 1956
Invalid names: Globigerinoides glomerosa glomerosa Blow 1956 [invalid subgroup]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. K. Olsson 1964 | Low trochospiral with strongly enveloping final chamber, globular to spherical; peripheral outline rounder, slightly lobate to circular. Wall: rather coarsely perforate. Chambers: very much inflated, globular or spherical, increasing rapidly in size; three to four in a whorl in early portion of the test, somewhat embracing so that the initial portion of the test has a rounded appearance; final chamber much inflated, embracing the earlier portion of the test from 40 to over 75 percent. Sutures: slightly depressed to flush with the surface. Apertures: umbilical on the initial whorl of chambers; numerous, long to short narrow slits or very small circular openings situated along the sutural contact between the ultimate chamber and the previous chambers, may also be present along sutural contacts of earlier-formed chambers. |