Diplocercides is an extinct genus of marine coelacanth which lived during the Late Devonian period. It is the only confirmed member of the family Diplocercididae (=Diplocercidae), although some studies classify other genera such as Nesides, Chagrinia, and Euporosteus in it as well.[1][2][3]
| Diplocercides Temporal range:
| |
|---|---|
| |
| Diplocercides heiligostockensis | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Sarcopterygii |
| Class: | Actinistia |
| Family: | †Diplocercididae Berg, 1940 |
| Genus: | †Diplocercides Stensiö, 1922 |
| Species | |
| |
Taxonomy
editThe following species are known:
- D. heiligenstockiensis Jessen, 1966 - Frasnian of Germany (Bergisch Gladbach Formation)[4]
- D. kayseri (von Koenen, 1895) - late Frasnian of Germany (Kellwasserkalk Formation) and early to middle Famennian of Poland (Holy Cross Mountains) (=Nesides schmidti Stensio 1937)[4][5]
- D. jaekeli Stensiö, 1922 - Frasnian of Germany (Bergisch Gladbach Formation)[4]
Indeterminate remains are known from the Frasnian of Iran, and potentially the Frasnian-aged Gogo Formation of Australia.[4][6] Specimens from South Africa that were formerly assigned to this genus have since been described in their own genus, Serenichthys. The species D. davisi Moy-Thomas, 1937, from the Mississippian of Ireland, which was formerly thought to be the only post-Devonian species, is now thought to represent a subadult Rhabdoderma, indicating that Diplocercides likely went extinct by the End-Devonian extinction.[5][7]
Description
editFossils of the species D. kayseri are known to have three-dimensionally preserved cranial endocasts, making it one of the only known coelacanths aside from the extant Latimeria where the shape of the brain is known. In 2010, three-dimensional specimens of tentative Diplocercides were described from the Gogo Formation of Western Australia, with these also containing preserved endocasts.[6][8]
References
edit- ^ "PBDB Taxon". paleobiodb.org. Retrieved 2024-09-06.
- ^ Laan, Richard Van Der (2018-10-11). "Family-group names of fossil fishes". European Journal of Taxonomy. 466: 1–167. doi:10.5852/ejt.2018.466.
- ^ Cloutier, Richard (1991-09-01). "Patterns, trends, and rates of evolution within the Actinistia". Environmental Biology of Fishes. 32 (1): 23–58. doi:10.1007/BF00007444. ISSN 1573-5133.
- ^ a b c d Forey, Peter L.; Ahlberg, Per E.; Lukševičs, Ervins; Zupiņš, Ivars (2000). "A New Coelacanth from the Middle Devonian of Latvia". Journal of Vertebrate Paleontology. 20 (2): 243–252. ISSN 0272-4634.
- ^ a b Szrek, Piotr (2007-12-10). "Coelacanths (Actinistia, Sarcopterygii) from the Famennian (Upper Devonian) of the Holy Cross Mountains, Poland". Acta Geologica Polonica. 57 (4): 403–413.
- ^ a b Long, John A.; Trinajstic, Kate (2010-04-01). "The Late Devonian Gogo Formation Lägerstatte of Western Australia: Exceptional Early Vertebrate Preservation and Diversity". Annual Review of Earth and Planetary Sciences. 38 (1): 255–279. doi:10.1146/annurev-earth-040809-152416. ISSN 0084-6597.
- ^ Gess, Robert W.; Coates, Michael I. (2015). "Fossil juvenile coelacanths from the Devonian of South Africa shed light on the order of character acquisition in actinistians: Fossil Coelacanths from the South African Devonian". Zoological Journal of the Linnean Society. 175 (2): 360–383. doi:10.1111/zoj.12276.
- ^ Clement, Alice; King, Benedict; Trinajstic, Kate; Cloutier, Richard; Long, John (2017). "An exceptional 3D coelacanth (Osteichthyes: Sarcopterygyii) from the Devonian of Australia and interpretation of fossil cranial endocasts: 14th International Symposium on Early and Lower Vertebrates". 14th International Symposium on Early and Lower Vertebrates, Chęciny, Poland. doi:10.5167/uzh-138408.
Bibliography
edit- LONG, J.A. & TRINAJSTIC, K. 2010. The Late Devonian Gogo Formation Lagerstatte –Exceptional preservation and Diversity in early Vertebrates. Annual Review of Earth and Planetary Sciences 38: 665-680
External links
edit- Diplocercides at Palaeos.
 | This article about a prehistoric lobe-finned fish is a stub. You can help Wikipedia by expanding it. |