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What is the difference between operculum and gill slits?
Operculum is for Osteichthyes while gill slits are for Chondrichthyes. Operculum serves as a covering of the fish gills while gill slits are individual openings to gills.
Operculum - Osteichthyes - covering of gills - can close and open Gill Slits - Chondrichthyes - opening of gills - always open