Question

Thermoreceptors of scoliodon are
A. Olfactory
B. Neuromast organs
C. Lateral line system
D. Ampullae of lorenzini

Answer 1

Hint: Scoliodon is also known as Dogfish. They belong to a class of chondrichthyes. They belong to that group of Pisces that bear fins and have cartilaginous endoskeleton. So, that’s why they are also known as cartilaginous fishes.

Complete answer:
- Scoliodon is a genus of requiem sharks in the family Carcharhinidae. They are marine animals with streamlined bodies.
- Endoskeleton is made up of Cartilage, so known as cartilaginous fishes.
- Mouth is placed ventrally.
- Notochord is present throughout life.
- Gill slits are separate with an operculum known as gill cover.
- The skin is tough, containing placoid scales.
- Teeth are modified placoid scales and jaws are very powerful.
- Heart is two-chambered consisting of one auricle and one ventricle.
- Some of them have electrical organs and possess poison sting.
- It is carnivorous and viviparous in nature.
- The body of fish is spindle shaped.
- They have an opening of sense organs known as Ampullae of Lorenzini.
- These are thermoreceptors.
- The neuromast is the organ which acts as sensors in the bodies of the fishes and the amphibians.
- The organs are placed along the lateral line.
- Lateral line system is a system of tactile sense organs which is found in many aquatic vertebrates beginning from cyclostomes fishes to an amphibian that helps to detect movements and pressure changes in the surrounding water.

Hence, the correct answer is option (D).

Note: Some more features of scoliodon are:
- They are ventrically moves
- Having prehensile Tail
- Sexes are separate
- Males have pelvic fins and claspers.
- Males are 33 mm in length and females are 36mm in length.
- Having two rows of homodont and polyphyodont teeth.