Tesnusocaris

Tesnusocaris goldichi was a species of crustacean that lived in the Pennsylvanian period, the one of the two representatives of the extinct Order Enantiopoda. Its fossil is from the Lower Pennsylvanian (Paleozoic, Carboniferous) Tesnus formation, Texas. ...
Found on http://en.wikipedia.org/wiki/Tesnusocaris

Tesnusocaris

(from the article `crustacean`) ...freshwater, some marine, and some in strong inland brines; about 900 species.†Class EnantiopodaCarboniferous; single fossil, Tesnusocaris.Class ...
Found on http://www.britannica.com/eb/a-z/t/29
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