Harpoceras
| Harpoceras Temporal range: Jurassic, 183.0–145.5Ma | |
|---|---|
 | |
| Fossil shell of Harpoceras subplanatum from Isère (France), on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ammonitida |
| Suborder: | Ammonitina |
| Superfamily: | Hildoceratoidea |
| Family: | Hildoceratidae |
| Subfamily: | Harpoceratinae |
| Genus: | Harpoceras Waagen 1869 |
| Synonyms | |
| |
Harpoceras is an extinct genus of cephalopod belonging to the family Hildoceratidae. These cephalopods existed in the Jurassic period, from Toarcian age to Aalenian age. [2] They were fast-moving nektonic carnivores. [1]
Species
- Harpoceras eseri Oppel 1856
- Harpoceras falciferum Sowerby 1820
- Harpoceras kisslingi Hug 1898
- Harpoceras lassum Buckman 1927
- Harpoceras mediterraneum Pinna 1968
- Harpoceras pseudoserpentinum Gabilly 1973
- Harpoceras rulleaui Bécaud 2006
- Harpoceras serpentinum Schlotheim 1813
- Harpoceras strangewaysi Sowerby 1820
- Harpoceras subexaratum Bonarelli 1899
- Harpoceras subplanatum Oppel 1856
Artist's impression of Harpoceras
Description
Shells of Harpoceras species can reach a diameter of about 12–20 centimetres (4.7–7.9 in). This ammonite has a flattened, moderately involute shell, with a sharp ventral keel. The sides of the shell aree covered with dense sickle-shaped ribs. The edge mouth shows a short rostrum on the ventral side.
Distribution
Fossils of species within this genus have been found in the Jurassic rocks of Argentina, Bulgaria, Canada, Germany, Hungary, Indonesia, Italy, Japan, Luxembourg, New Zealand, Spain and United Kingdom. [1]
References
- ↑ 1.0 1.1 1.2 1.3 The Paleobiology Database
- ↑ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda