Lyreidus tridentatus is a species of crab in the family Raninidae.

[1] This species as an unusual carapace in that it is longer than it is wide.

They have a reddish to reddish-brown body, with a reticulated pattern.

Lyreidus tridentatus occurs in Australia, New Zealand, New Caledonia, China, Taiwan, Japan, Fiji, and Hawaii.

This species lives on shelves and slope substrates in sandy mud.