30131 - Museum Grade Beckwithia type Cambrian Aglaspid Middle Cambrian Utah
30131 - Museum Grade Beckwithia type Cambrian Aglaspid Middle Cambrian Utah 30131 - Museum Grade Beckwithia type Cambrian Aglaspid Middle Cambrian Utah 30131 - Museum Grade Beckwithia type Cambrian Aglaspid Middle Cambrian Utah 30131 - Museum Grade Beckwithia type Cambrian Aglaspid Middle Cambrian Utah 30131 - Museum Grade Beckwithia type Cambrian Aglaspid Middle Cambrian Utah

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30131 - Museum Grade Beckwithia type Cambrian Aglaspid Middle Cambrian Utah

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Species
Beckwithia type Cambrian Aglaspid
Age
Middle Cambrian (~509 Million Years)
Location
Millard County, Utah, USA
Formation
Weeks Formation
Size
40.9 mm   •    in
Weight
142 g   •    oz
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Description

Aglaspidida is an extinct order of aquatic arthropods that were once regarded as primitive chelicerates. However, anatomical comparisons demonstrate that the aglaspidids cannot be accommodated within the chelicerates, and that they lie instead within the Artiopoda, thus placing them closer to the trilobites. Aglaspidida contains the subgroups Aglaspididae and Tremaglaspididae, which are distinguished by the presence of acute/spinose genal angles and a long spiniform tailspine in the Aglaspididae.

 

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