Yohoia is a small animal that lived during the
Cambrian period. Its fossils
were found in the Burgess Shale in the Canadian Rockies in British Columbia,
Canada.
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.
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