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ARKARUA adami
Gehling, 1987

Arkarua adami is described as one of the earliest known echinoderms. It has five-pointed symmetry (pentameral symmetry) just like living echinoderms (e.g. starfish, sea stars and sand dollars).

Localities:
Flinders Ranges, South Australia
Siberia

Key reference:
Gehling, 1987
Liu et al., 2013

Picture
Arkarua from South Australia. Image: Dr Alex Liu
Diagnosis (from Gehling, 1987): 
Discoidally to hemispherically shaped echinoderm with a pentameral starshaped depression on oral surface, comprising ambulacral grooves meeting in a domed to depressed peristomial region. Theca of variable convex shape, polygonal to oval outline, surrounded by marginal rim with fine radially arranged ribs.
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