Fryeria marindica can be recognized according to following characteristics :
- the body is greyish blue
- in the centre of the mantle there are 2 longitudinal black lines and one blue ridge with more or less close yellow tubercles
- the edge of the mantle has numerous transverse black bands
- the rhinophores are yellow
- the foot is uniformly grey

The genus Fryeria can be recognized according to the position of anus, located under the mantle, while it is located in the dorsal midline in other phyllidiids.

Fryeria marindica can be mistaken for Phyllidia coelestis and Phyllidia varicosa. They can be distinguished by the number of longitudinal black lines : P. varicosa has 4 ones, P. coelestis has 3 ones and F. marindica has only 2 lines.

Fryeria marindica could also be mistaken for Fryeria rueppelii and Fryeria menindie. They can be distinguished by the tubercles which aren't aligned like a longitudinal ridge in F. rueppelii and F. menindie.

African Indian Ocean