Pseudogygites

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Pseudogygites
Temporal range: Middle Ordovician–Upper Ordovician
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Pseudogygites sp.jpg
Scientific classification Red Pencil Icon.png
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]

Contents


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.[ citation needed ]

Species

Four species have been described:

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<i>Pseudonaraoia</i> genus of trilobites (fossil)

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<i>Geragnostus</i> genus of trilobites (fossil)

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<i>Cyclopyge</i> (trilobite) genus of arthropods (fossil)

Cyclopyge is a genus of small to average size trilobites that lived during the Ordovician. Like all members of the family Cyclopigidae, it has very large convex eyes, that cover most of the free cheeks, and in some species touch each other. The eyes almost touch the large glabella. The occipital ring has merged with the rest of the glabella. The glabella does not extend into a frontal thorn. The cephalon lacks genal spines. The 6 thorax segments have short pleurae. The pygidium is rather large, and often rather effaced. These are features that also occur in other Cyclopygidae, and are indications of a pelagic lifestyle.

<i>Illaenus crassicauda</i> species of trilobite (fossil)

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References

  1. 1 2 3 4 Audubon Field Guide To Fossils . ISBN   978-0-394-52412-2.