Crenidens macracanthus, Günther's karanteen, is a species of marine ray-finned fish belonging to the family Sparidae, which includes the seabreams and porgies. This fish is found in the Indian Ocean.

Taxonomy Crenidens macracanthus was first formally described in 1874 by the German-born British herpetologist and ichthyologist Albert Günther with its type locality as Madras in India, on the Bay of Bengal. This taxon was previously treated as a synonym of Crenidens crenidens but was recognised as a valid species in 2013. The genus Crenidens is placed in the family Sparidae within the order Spariformes by the 5th edition of Fishes of the World. Some authorities classify this genus in the subfamily Boopsinae, but the 5th edition of Fishes of the World does not recognise subfamilies within the Sparidae.

Etymology Crenidens macracanthus has the specific name macracanthus which means "large spined", a reference to the larger spines in the dorsal and anal fins relative to C. crenidens.

Description Crenidens macracanthus differs from its congeners by its second anal fin spine being much longer than the third. It has 12 spines and 10 soft rays supporting the dorsal fin while in the other species it is typically supported by 11 spines and 11 soft rays. Their teeth are also different being incisoriform with 5 points all roughly being equal in side, the three middle points being notably larger than the two outer points in the other species.