| Pseudogygites | |
|---|---|
) | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | †Trilobita |
| Order: | †Asaphida |
| Family: | †Asaphidae |
| Genus: | †Pseudogygites Kobayashi, 1934 |
| Type species | |
| Asaphus canadensis Chapman, 1856 | |
Pseudogygites is an extinct genus of trilobites from the Middle and Upper Ordovician.[1]
Description
The pygidium and the cephalon are about equal in size and shape. The glabella is expanded forward, reaching to the anterior margin. Pseudogygites has short genal spines and small compound eyes located in the center of the cephalon with the glabella in between. The pygidium contains faint pleural furrows and no axial rings.[1] Pseudogygites species can reach 25 centimetres (10 in) in length and 10 cm (4 in) in width.[1]
Distribution
Pseudogygites is found in late Ordovician oil shales in New York, Ontario, and Southampton Island in the Canadian Arctic.[1] Pseudogygites species are known from exposures of the Billings Shale and Blue Mountain formations.
Species
Four species have been described:
- Pseudogygites latimarginata (Hall, 1847)
- Pseudogygites hudsoni
- Pseudogygites akpatokensis
- Pseudogygites arcticus
References
- ^ a b c d Audubon Field Guide To Fossils. ISBN 978-0-394-52412-2.