Evynnis cardinalis, the threadfin porgy or cardinal seabream, 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 Western Pacific Ocean off the coasts of Eastern Asia. It is an important food fish but is classified by the IUCN as Endangered.

Taxonomy Evynnis cardinalis was first formally described as Sparus cardinalis by the French naturalist Bernard Germain de Lacépède with its type locality given as China and Japan. In 1912 the American ichthyologists David Starr Jordan and William Francis Thompson proposed a new monospecific genus, Evynnis, with S. cardinalis as its only species and as the designated type species of the genus. This genus 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 Sparidae, but the 5th edition of Fishes of the World does not recognise subfamilies within the Sparidae.

Etymology Evynnis cardinalis has the specific name cardinalis, meaning "red", an allusion to the pale red or pinkish colour of the fish.

Evynnis cardinalis has a robust, strongly compressed body which is deeper than its head. The upper profile of the head is oblique, frequently showing a bulge near the eyes.