Lethrinus atkinsoni, the Pacific yellowtail emperor,, Atkinson's emperor, reticulated emperor, tricky snapper, Tuamotu emperor, yellow morwong or yellow-tailed emperor is a species of marine ray-finned fish belonging to the family Lethrinidae, the emperor breams and emperors. This fish is found in the Western Pacific Ocean.

Taxonomy Lethrinus atkinsoni was first formally described in 1910 by the American ichthyologist Alvin Seale with its type locality given as Balabac Island in the Philippines. Some authors place the genus Lethrinus in the monotypic subfamily Lethrininae, with all the other genera of Lethrinidae placed in the Monotaxinae, however, the 5th edition of Fishes of the World does not recognise the subfamilies traditionally accepted within the family Lethrinidae as valid. The family Lethrinidae is classified by the 5th edition of Fishes of the World as belonging to the order Spariformes.

Etymology Lethrinus atkinsoni has a patronym for its specific name, Seale did not say who he was honouring with the patronym nut it is thought likely to be the illustrator William Sackston Atkinson who prepared plates for Seale.

Description Lethrinus atkinsoni has a continuous dorsal fin which is supported by 10 apines and 9 fost rays while the anal fin is supported by 3 spines and 8 soft rays. It has a moderately deep body that has a standard length of between 2.3 and 2,6 times its depth. The dorsal profile of the head is clearly convex near the eyes and the snout is short and blunt with a steep, straight profile. This species has a yellow tail and a yellow mark over the eye, it may show a wide yellow longitudinal stripe running along the midflank.