Asteracanthus
Asteracanthus is an extinct genus of Elasmobranchii (sharks belonging to the family Hybodontidae).
| Asteracanthus | |
|---|---|
 | |
| Dorsal fin-spine ornamented by stellate tubercles of Asteracanthus ornatissimus. Jurassic of England | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Order: | †Hybodontiformes |
| Family: | †Hybodontidae |
| Genus: | †Asteracanthus L. Agassiz, 1837 |
Fossil records
Fossil teeth of Asteracanthus
This genus is known in the fossil records from the Devonian to the Cretaceous (age range: from 416.0 to 70.6 million years ago). Fossils are found in the marine strata of United States, Iran, Switzerland, Madagascar and Europe.[1]
Species
Species within this genus include:[1]
- Asteracanthus acutus Agassiz 1837
- Asteracanthus granulosus Egerton 1854
- Asteracanthus magnus Agassiz 1838
- Asteracanthus medius Owen 1869
- Asteracanthus minor Agassiz 1837
- Asteracanthus ornatissimus Agassiz 1837
- Asteracanthus papillosus Egerton 1854
- Asteracanthus semisulcatus Agassiz 1837
- Asteracanthus siderius Leidy 1870
- Asteracanthus somaensis Yabe 1902
- Asteracanthus tenuis Agassiz 1838
- Asteracanthus udulfensis Leuzinger et al. 2017[2]
gollark: Probably!
gollark: They are subject to various conservations laws, of course.
gollark: As you should know if you've studied *any* modern esoteric topological theory, certain geometries are unstable and may decay into smaller geometries.
gollark: No.
gollark: Anyway, I'm thinking that this could connect to the applications of heptagrams in weapons technology, and how engineers are known to use π = 3 and other approximations.
References
- Paleobiology Database
- Léa Leuzinger; Gilles Cuny; Evgeny Popov; Jean-Paul Billon-Bruyat (2017). "A new chondrichthyan fauna from the Late Jurassic of the Swiss Jura (Kimmeridgian) dominated by hybodonts, chimaeroids and guitarfishes". Papers in Palaeontology. 3 (4): 471–511. doi:10.1002/spp2.1085.
- L. Agassiz. 1837. Recherches Sur Les Poissons Fossiles. Tome III (livr. 8-9). Imprimérie de Petitpierre, Neuchatel viii-72
- Arthur Smith Woodward The Fossil Fishes of the English Wealden and Purbeck Formations Cambridge University Press
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