Definition of Antiarcha
: a subclass or other division of Placodermi comprising small Devonian freshwater ostracoderms having complex bony armor on the anterior part of the body and a pair of pectoral appendages resembling paddles
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Origin and Etymology of antiarcha
New Latin, from 1anti- + -archa (from Greek archos anus); from the contrast in the location of the anus with that of the Urochordata
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