Bradoriids are small marine arthropods with a bivalved carapace, and were globally distributed, forming a significant portion of the Cambrian and early Ordovician soft-bodied communities. == Affinity == Whilst the Bradoriida were traditionally considered as relatives of the modern bivalved arthropod group Ostracoda, the anatomy of their appendages...
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http://en.wikipedia.org/wiki/Bradoriida
(from the article `crustacean`) ...of appendages; most fossils known only from shells (carapaces); marine, freshwater, and some terrestrial; more than 2,000 living species ...
Found on
http://www.britannica.com/eb/a-z/b/104
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