Which of the following classes is incorrectly matched with its genera...
Incorrectly matched Class and General Characters
Class: Cyclostomata
Incorrect General Characters:
- Lack jaws and paired fins
- Body is covered with placoid scales
Correct General Characters:
- Lack jaws and paired fins
- Body is covered with a slimy skin without scales
Explanation:
Cyclostomata are jawless fish that include lampreys and hagfish. They have a circular mouth with sharp teeth and a tongue covered in tiny, sharp projections. They also lack paired fins and have a slimy skin without scales. The incorrect general characters listed in option A actually describe the cartilaginous fish, which include sharks and rays. These fish have jaws and paired fins, and their skin is covered with placoid scales. Therefore, option A is the incorrectly matched class and general characters.
Which of the following classes is incorrectly matched with its genera...
Cyclostomata or agnatha is a superclass belonging to the subphylum Vertebrata of the phylum Chordata. It is represented by a group of agnathans, that includes jawless fishes (the lampreys, hagfishes and, several other extinct groups). The term Cyclostomata literally means “round mouths”. They are the only known living jawless vertebrates, hence called agnatha. Mouths of these jawless fishes contain horn-like epidermal structures that carry out the function of teeth. Their bodies are round and long like eels. Paired fins are absent. The skin is soft, smooth, and without scales. As they represent subphylum Vertebrata, they are also known as jawless vertebrates. Members of agnatha possess a skull that is cartilaginous, so they are also included under the clade Craniata.
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