Question

Sawfish is
(a) Betta
(b) Pristis
(c) Exoceptus
(d) Trygon

Answer 1

Hint: Sawfish belongs to the phylum Chordata, superclass Gnathostomata, extinct class chondrocytes, and family Pristidae. It is also called freshwater sawfish, common sawfish.

Complete answer:
Sawfish belongs to class Chondrichthyes that are marine cartilaginous endoskeleton containing fishes. They are also called carpenter sharks. Sawfishes are characterized by long, narrow, flattened, nose extensions with sharp transverse teeth resembling a saw. Sawfish belongs to the family Pristidae. Pristis is the genes of sawfish.

Additional Information: - Pisces or fishes include two extent classes namely Chondrichthyes and Osteichthyes.
- Marine fishes that contain cartilaginous endoskeleton come under the class Chondrichthyes.
- Some of the important features of fishes present in this class are: They have asymmetrical caudal fin(heterocercal) and placoid scales are covered all over the skin. Five to seven pairs of lamelliform gills are present for respiration and they are viviparous.
- Examples of chondrichthyes: Scoliodon(dogfish), Pristis(sawfish), Carcharodon(great white shark), torpedo(electric ray).
- Sawfishes are listed under the list of critically endangered species by IUCN.
- They became endangered species because they are being hurt for their fins, teeth, and saw, body parts are used as internal medicine.
- Pristis clavata, Pristis pectinata, Pristis zijsron, Pristis pristis are some of the living species of sawfish that are critically endangered.
So the correct answer is ‘Pristis’.

Note: Siamese fighting fish is the common name of the Betta splendens, flying fish is called exocoetus. They both belong to the class Osteichthyes.
Trygon is commonly called stingray belonging to the class Chondrichthyes. It is a poison sting in the defense.