Dicrorygma Poag 1962
Creators
- 1. Universidade Federal de Pernambuco, Departamento de Geologia, Programa de Pós-Graduação em Geociências, Av. da Arquitetura, s / n, 50740 - 550, Recife, PE, Brazil. rildacardoso @ gmail. com; https: // orcid. org / 0000 - 0001 - 6895 - 3500.
- 2. Universidade Federal da Paraíba, Departamento de Ciências Biológicas, Centro, 58397 - 000, Areia, PB, Brazil.
- 3. Universidade Federal de Pernambuco, Departamento de Geologia, Laboratório de Paleontologia, Av. da Arquitetura, s / n, 50740 - 550, Recife, PE, Brazil. alcina. franca @ ufpe. br; https: // orcid. org / 0000 - 0003 - 0864 - 7995.
- 4. Museu de Paleontologia PlácidoCidade Nuvens, Universidade Regional do Cariri, Santana do Cariri, CE, 631900 - 000, Brazil.
- 5. Universidade Federal de Pernambuco, Departamento de Geologia, Laboratório de Paleontologia, Av. da Arquitetura, s / n, 50740 - 550, Recife, PE, Brazil. flaviapedrosa. geo @ gmail. com; https: // orcid. org / 0000 - 0003 - 2283 - 7162.
- 6. Universidade Federal Rural de Pernambuco, Departamento de Biologia, Laboratório de Paleoecologia e Sistemática de Paleoinvertebrados, Rua Dom Manoel de Medeiros s / n, Recife, PE, Brazil.
- 7. Universidade Federal de Pernambuco, Departamento de Geologia, Laboratório de Paleontologia, Av. da Arquitetura, s / n, 50740 - 550, Recife, PE, Brazil. exinarico @ gmail. com
- 8. PETROBRÁS / CENPES, Rio de Janeiro, RJ, Brazil. christiano. ng @ petrobras. com. br; https: // orcid. org / 0000 - 0003 - 1279 - 5640.
Description
Dicrorygma (Orthorygma ?) dimorpha Weiss, 1996
Fig. 5G–I
1990 Ostracoda gen. et sp. indet,—Zihrul: 89, Taf. 6, Fig. 60.
1996 Dicrorygma (Dicrorygma ?) n. sp. a—Weiss: 119, Abb. 10 Fig. 7–8; Tar. 1, Fig. 10–15; Taf. 2, Fig. 8.
2022 Dicrorygma (Orthorygma?) dimorpha —Araripe et al., p 7, fig. 5 (6a–b).
Illustrated material. Adult carapace, Nº. DGEO-CTG-UFPE-1524 (Fig. 5 G–I)
Dimension. Nº. DGEO-CTG-UFPE-1524 (Fig. 5 G–I); L= (LV) 0.426 / (RV) 0.396 mm, H= 0.233 mm, and W= 0.213 mm.
Comparison. It was not possible to compare with reference collection materials. Dicrorygma (Orthorygma ?) dimorpha was compared to illustrations in Michael Weiss (1996); both species are very small, with a smooth surface and subtriangular carapace. The posterior end is sharp, joining the small caudal process in lateral view. The dorsal view is very similar, but the caudal process is smaller in the specimen found. We also compared the species studied with the illustrations of the species Parataxodonta inornate Kaye 1965, but they are different in the dorsal view.
Occurrence and associated fauna. It was recorded in the Santo Antônio section, exclusively at following depth (from base to top) of 5.65 m. Dicrorygma (Orthorygma ?) dimorpha occurs with D. grandiensis and Dicrorygma cf. minuta, which occurs throughout most of the section.
Observations. Dicrorygma (Orthorygma ?) dimorpha and Dicrorygma cf. minuta comprise the first record of this genus in the Araripe Basin (Aptian). Weiss (1996), characterized the sexual dimorphism for this species, and the specimen found is similar to the male described by this author. It is worth pointing out that it is a very small species, and like the species belonging to the genus Perissocytheridea Stephenson, 1938, they are only recovered in the smallest sieves and in the sorting process in the finest granulometry, thus requiring greater attention and persistence to recover.
Stratigraphic distribution. NW-German Kimmeridgian, Upper section (sample 5/7a), Lower Kimmeridge (ostracod-zone 10, Kimmeridgian) (Babinot et al. 2007). Brazil, Araripe Basin, Romualdo Formation, upper Aptian (this work).
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Cuneocytheridae
- Genus
- Dicrorygma
- Kingdom
- Animalia
- Order
- Podocopida
- Phylum
- Arthropoda
- Scientific name authorship
- Poag
- Taxon rank
- genus
- Taxonomic concept label
- Dicrorygma Poag, 1962 sec. Tomé, Araripe, Oliveira, Barreto, Prado, Pedrosa, Pereira, Nascimento & Ng, 2022
References
- Weiss, M. (1996) Neue Ostracoden aus dem Kimmeridgium NW-Deutschlands. Palaontologische Zeitschrift, 70 (3 / 4), 461 - 474. https: // doi. org / 10.1007 / BF 02988085
- Kaye, P. (1965) Some new British Albian Ostracoda. Bulletin of the British Museum (Natural History), 11 (5), 215 - 253.
- Stephenson, M. B. (1938) Lower Eocene Ostracoda of the genus Cytheridea. Journal of Paleontology, 10 (8), 695 - 703.
- Babinot, J. F., Moullade, M. & Tronchetti, G. (2007) The upper Bedoulian and lower Gargasian Ostracoda of the Aptian strato- type: Taxonomy and biostratigraphic correlation. Carnets de Geologie, 5, 1 - 35. https: // doi. org / 10.4267 / 2042 / 8877