Microcotyle odacis is a species of monogenean, parasitic on the gills of a marine fish.

[1] Microcotyle odacis was first described and illustrated based on 15 specimens from the gills of Odax semifasciatus (Odacidae),[1] (currently Haletta semifasciata).

[4] M. odacis was redescribed and illustrated from the type-host and locality and the original figures and description of the adult morphology were completed.

The haptor is symmetrical, distinctly separated from the rest of the body and bears clamps, arranged as two rows, one on each side (28 on the right and 30 on the left).

The reproductive organs include an anterior genital atrium, armed with numerous spines, a medio-dorsal vagina, a single incompletely S-shaped ovary consisting of a convoluted tube and 14 testes which are posterior to the ovary.