Which one of the following pairs of animals comprise 'jawless fishes'?
Correct answer: B. Lampreys and hag fishes
- A. Mackerals and rohu
- B. Lampreys and hag fishes
- C. Guppies and hag fishes
- D. Lampreys and eels
Explanation
Agnatha is subphylum or superclass of marine and fresh water vertebrates that lack jaws. They are fishlike animals with cartilaginous skeletons and well developed sucking mouthparts with horny teeth. The only living agnathans are lampreys and hagfishes (Class Cyclostomata), which are parasites or scavengers.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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