opercular flap

opercular flap
a postero-dorsal fleshy part of the gill cover, either composed solely of skin or also supported by an extension of the opercle. See also opercular lobe.opercular head spine
a spine on the head of Scorpaenidae members. They are, from anterior to posterior over the top of the head on each side, the nasal, preocular, supraocular, postocular, tympanic, coronal (medial to the tympanic and postocular spines), parietal, and nuchal. Opercular spines are at the postero-dorsal corner of the operculum, preopercular spines line the posterior margin of the preoperculum, and the cleithral and postcleithral spines are just above the opercular spines on the side of the head

Dictionary of ichthyology. 2009.

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