Placidichthys-type locality: Late Aptian, Brazil
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Ophiopsiformes
- Ophiopsiellidae
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Placidichthys bidorsalis n. gen., n. sp.
Brito 2000
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4 specimens | |||||||||
| MPSC-P 288a and b, MPSC-P 775, PMB-UERJ 300a and b, PMB-UERJ 301 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Brazil | State/province: | Ceará |
| Coordinates: | 7.2° South, 40.0° West (view map) | ||
| Paleocoordinates: | 5.0° South, 2.2° East (Wright 2013) | ||
| Basis of coordinate: | based on nearby landmark |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| 10 m.y. bin: | Cretaceous 2-3 | ||
| Key time interval: | Late Aptian | ||
| Age range of interval: | 119.57 - 113.2 m.y. ago |
Stratigraphy
| Geological group: | Santana | Formation: | Romualdo | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: Romualdo Member, Santana Formation, Lower Cretaceous, Albian
From Melo et al. 2020: In summary, this integrated study of foraminifera, ostracodes and other microfossil data from the Romualdo Formation indicates that the local Alagoas Stage (Ostracoda Zone RT-011) can now be constrained to the Aptian. Arai and Assine 2020 also support that the Romualdo Formation is entirely Aptian in age. | |||||
Lithology and environment
| Primary lithology: | nodular not reported |
| Includes fossils? | Y |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some genera |
| Collection methods: | observed (not collected) |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: In 1995 the late Professor Murilo R. Lima gave me an enigmatic and badly preserved fossil nodule from the Santana Formation...The recent discovery of new, better-preserved specimens in the nodules of the Santana Formation and in the Crato Formation, as well as the preparation of two specimens using chemical techniques, allows the description of this new halecomorph. | |
| Taxonomic list comments:Since the last century, a variety of fossil fishes have been recovered from the Lower Cretaceous Araripe Basin of northeast Brazil. These fossils, known by their excellent preservation and diversity include elasmobranchs, halecomorphs, lepisosteids, semionotids, pycnodontids, teleosts, as well as coelacanths | |
Metadata
| Database number: | 124310 | ||
| Authorizer: | G. Lloyd | Enterer: | G. Lloyd |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2012-02-11 01:43:45 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2012-02-11 01:43:45 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 40070. | P. M. Brito. 2000. A new halecomorph with two dorsal fins, Placidichthys bidorsalis n. g., n. sp. (Actinopterygii: Halecomorphi) from the Lower Cretaceous of the Araripe Basin, northeast Brazil. Comptes Rendus de l'Academie des Sciences Paris, Sciences de la Terre et des planètes 331:749-754 [G. Lloyd/G. Lloyd] |