Yohoia was about ¼ inch to just under 1 inch (0.7 to 2.3 centimeters) long. It is believed to have been a bottom dweller, was an Arthropod, and is placed in the Arachnomorph group with Arthropoda (Arachnomorpha includes the Chelicerates such as horseshoe crab, spiders and scorpions, as well as the Trilobites).
Yohoia had a head-shield with two large jointed appendages, each ending in 4 long spines, as well as 3 pairs of downward hanging appendages which may have supported the creature on the sea-bottom. To the rear of the head-shield were 13 plated segments ("tergites"). The first 10 tergites each had backward facing projections, and the last 3 completed encircled the body, beneath the body were additional appendages which may have been used for swimming and/or respiration. At the end of the body was a paddle-like tail.
Yohoia was a strange marine animal that lived during the Cambrian period
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