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Planoheterohelix
Taxonomy
Planoheterohelix was named by Georgescu and Huber (2009). It was considered unknown by Georgescu and Huber (2009).
It was assigned to Heterohelicidae by Georgescu and Huber (2009).
It was assigned to Heterohelicidae by Georgescu and Huber (2009).
Synonymy list
| Year | Name and author |
|---|---|
| 2009 | Planoheterohelix Georgescu and Huber |
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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. †Planoheterohelix Georgescu and Huber 2009
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. D. Georgescu and B. T. Huber 2009 | Test is biserial throughout. Proloculus is small and followed by larger second chamber. Chambers are subglobular to globular in early portion of test and often reniform in adult. Periphery is broadly rounded. Aperture is a low- to medium-high arch situated at base of last-formed chamber; it is bordered by two symmetrically developed flanges. Chamber surface is smooth or with fine longitudinal costae in earlier species and completely costate in evolved ones. Test wall is calcitic, hyaline, microperforate to finely perforate. Pores are situated in intercostal spaces or they might penetrate and interrupt costae. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Middle Campanian to the top of the Campanian or 83.50000 to 72.10000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cretaceous | South Pacific (Equatorial Pacific) | P. sp. (219906) | |
| Santonian - Campanian | Chile | P. globulosa (231971 231973) P. globulosa, P. reussi (231969) P. reussi (231974) | |
| Middle Campanian | Israel (Southern District) | P. globulosa (220176) |