Question

Non-tetrapod vertebrates contain

• A. Osteichythes and chondrichthyes
• B. Agnatha, osteichthyes and chondrichthyes
• C. Agnatha and chondrichthyes
• D. Agnatha

Answer 1

The correct option is B Agnatha, osteichthyes and chondrichthyes

Non-tetrapod vertebrates are the vertebrates that don't have four legs.

• Class Chondrichthyes comes under the superclass Pisces. Most fishes are marine and a few live in the tropical rivers.
• Class Osteichthyes comes under the superclass Pisces and includes lungfishes, lobbed finned fishes and ray-finned fishes.
• Agnatha is a paraphyletic superclass of jawless fish and includes two class, Cyclostomata, and an extinct class Ostracodermi.

Since all these include fishes and fishes do not have four legs, they are non-tetrapod vertebrates.

So, the correct answer is 'Agnatha, Osteichthyes, and Chondrichthyes'.