spiny ray


Definition of spiny ray

: a fin ray that is stiff, unbranched, pointed at the end, and lacking transverse segmentation, that occurs singly or grouped in the anterior part of the dorsal fin in many fishes or in the first dorsal when there are two as well as in the anal and ventral fins, and that was in former classifications the principal character of the group Acanthopterygii opposed to soft ray

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readily or continually undergoing change

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