Key to species of the genus Dictyosoma

1a. Third lateral line completely present to anus................................................................ 2

1b. Third lateral line absent or incompletely present to anus.................................. Dictyosoma burgeri type B

2a. Total vertebrae fewer than 68, anal-fin rays fewer than 42, a distinctive blackish-brown blotch present on the upper region of opercle........................................................................ Dictyosoma rubrimaculatum

2b. Total vertebrae more than 70, anal-fin rays more than 45, no blackish-brown blotch on the upper region of opercle................................................................................ Dictyosoma tongyeongensis sp. nov.