peduncular plate(s)

peduncular plate(s)
the bony plate(s) on the caudal peduncle of some Acanthuridae which become sharply keeled forming a defensive weapon, e.g. in Prionurinae and Nasinae (in Acanthurinae there is a posteriorly hinged erectile sharp spine in a groove)

Dictionary of ichthyology. 2009.

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