Serrodiscus
gravestocki
Trilobites
Order Agnostida, Suborder Eodiscina, Family Weymouthidae
Geological
Time: Early Cambrian (~520 million years ago)
Size: 6 mm
long X 4 mm wide
Fossil Site:
Mernmerna Formation, Oraparinna Shale Transition Zone, Bunyeroo Gorge,
Flinders Ranges, South Australia
|  Description:
This is an unusual member of the Order Agnostida known as Serrodiscus
gravestocki. It is assigned to the Suborder Eodiscina which are
somewhat of a “missing link” group. Unlike most agnostids,
the fact that many have eyes, facial sutures, and a thoracic region
more typical of other trilobite orders suggests that they are allied
closely to the Ptychopariida. While trilobites from the Flinders
Range have been known for a century, there is a paucity of information
available in the literature.
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