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Dating from the upper Cretaceous, the centropomids are of typical percoid shape, distinguished by having two-part dorsal fins, a lateral line that extends onto the tail, and, frequently, a concave shape to the head.
Leading shark expert Leonard Compagno emphasised the need to check the dentition and the dorsal fin proportions in order to confirm the specimen as G.
The interspinous membrane of the first dorsal fin, the individual soft rays and the caudal fin are also spotted, with the caudal fin heavily spotted.
A row of indistinct spots or blotches runs along the base of the first, spinous dorsal fin, whose anterior most interspinous membranes are dusted with black spots.