Question

The character not related to chondrichthyes is ______________.

• A. Claspers
• B. Placoid scales
• C. Filamentous gills
• D. Heterocercal caudal fin

Answer 1

Answer: (C)

Filamentous gills

C. Filamentous gill

Reason: Chondrichthyes is a subclass of clas pisces. It is consist of cartilaginious fishes. Those are jawed fishes with paired fins, paired nares, scales, a heart with its chambers in series and skeletons made of cartilage rather than bone. The chondrichthyes have lamelliform gills and not filamentous gills. The filamentous gill is a characteristic of common carps (osteichthyes). They have claspers, have toothlike scales called as dermal denticles or placoid scales and presence of heterocercal caudal fin. So the correct option is C.