Well-Preserved Horseshoe Crab Ancestor

Part and Counterpart

Xiphosurida

Class Merostomata, Order Xiphosurida

Geological Time: Ordovician

Size (25.4 mm = 1 inch): Fossil is 35 mm long (curve measure) by 15 mm wide on an 85 mm by 45 mm and 95 mm by 40 mm matrix pair

Fossil Site: Fezouata Formation, Zagora, Morocco

Fossil Code: 14065

Price: Sold


Xiphosurida Horseshoe Crab AncestorDescription: This arthropod is a member of the Xiphosurida. These ancient relatives resemble the modern-day horseshoe crabs referred to some as “living fossils” due to the fact that they have changed but little over time. This one is in excellent shape, showing detail of the prosoma (head), opisthosoma (abdomen) and telson (tail) tail) in both part and counterpart in dorsolateral aspect. Sometimes it is difficult in photographs to determine part and counterpart. The counterpart is the right side in the photograph showing both.

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