Pseudogygites

Pseudogygites is an extinct genus of trilobites from the Middle and Upper Ordovician.[1]

Pseudogygites
Temporal range: Middle Ordovician–Upper Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Asaphida
Family: †Asaphidae
Genus: †Pseudogygites
Kobayashi, 1934
Type species
Asaphus canadensis
Chapman, 1856


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
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References
  1. Audubon Field Guide To Fossils. ISBN 978-0-394-52412-2.


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