3 public questions tagged with this topic.
Chondrichthyes (cartilaginous fishes) do not have an operculum (gill cover); it is a feature of bony fishes (Osteichthyes).
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Scoliodon (dogfish) is a cartilaginous fish belonging to class Chondrichthyes.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Pristis (Sawfish) belongs to class Chondrichthyes and has a cartilaginous skeleton.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
