What is the function of nostril is Scoliodon?
The nostrils are placed one at each angle of the mouth. These are exclusively olfactory in function and have no connection with the mouth cavity. Each nostril is partly covered by a small fold of skin.
Which type of skills are found on the skin of Scoliodon?
Scoliodon have placoid scales on their skin.
What do you know about Scoliodon?
Biology. Scoliodon(Dog fish) has an elongated, spindle-shaped body tapered at the ends, making it a very fast swimmer. The trunk and tail are laterally compressed, while the head region is dorsoventrally compressed. The entire body is covered by an exoskeleton of placoid scales.
What are the external features of dogfish?
External Features of the Dogfish Shark
- Head. Broad and somewhat flattened.
- Trunk. Fusiform in shape in order to facilitate locomotion Gradually tapers posteriorly.
- Tail. Compressed laterally,it bears a caudal fin.
- External gill slits.
- Spiracle.
- Eyes.
- Lateral Line Canal.
- Pectoral fins.
Which olfactory sac is Scoliodon?
The olfactory organs of Dogfish (Scoliodon) are a pair of blind olfactory sacs lying on the ventral side of the head in front of the mouth. They are invaginations of the ectoderm and do not communicate with the buccal cavity by an internal opening.
Is Scoliodon a bony fish?
Complete answer: Scoliodon is a cartilaginous fish.
What is the food of Scoliodon?
Dogfish (Scoliodon) is carnivorous and feeds mainly on other fishes, but the diet may also include rock-crabs, lobsters and spider-crabs. Food is swallowed without mastication. The teeth of Dogfish (Scoliodon) only prevent the escape of prey from the mouth and do not perform the function of mastication.
What is the classification of Scoliodon?
Cartilaginous fishes
Scoliodon/Class
What kind of tail does a Scoliodon have?
The dorsal side of Scoliodon is dark-grey while the underside is pale white. Tail is oval in cross-section and bears a heterocercal type of caudal fin, i.e., the posterior end of the vertebral column is bent upwards and lies in the dorsal or epichordal lobe.
How many eyes of Scoliodon has muscles?
Answer: Two eye ball muscles in Scoliodon are superior rectus muscle and inferior oblique muscle. Explanation: The superior rectus muscle is based outwards and upwards and along with the inferior, anterior and posterior rectus places the eye ball in the pit.
Why Scoliodon is known as dogfish?
– Scoliodon is a fish which is cartilaginous. It is often referred to as dogfish because it has a strongly evolved sense of dog-like smell. This power of smell helps it to find food. Thus, the correct answer is option (D) Power of smell.
What is venous heart in Scoliodon?
Anteriorly conus arteriosus leave the pericardium and extends further in the form of ventral aorta. Working of the heart: The heart of Scoliodon is a venous heart containing only deoxygenated or venous blood. In a complete circuit of body, the blood passes through heart only once (single circulation).
What kind of body does a Scoliodon have?
Scoliodon has an elongated, spindle-shaped body tapered at the ends, making it a very fast swimmer. The trunk and tail are laterally compressed, while the head region is dorsoventrally compressed. The entire body is covered by an exoskeleton of placoid scales. The mouth is located on the ventral side and is bound on both sides by jaws.
What makes a Scoliodon different from other dogfishes?
The genus Scoliodon is distinguished from other dogfishes by having an elongated snout, depressed head and a compressed body. The teeth are similar in both the jaws.
What kind of fish does a Scoliodon shark eat?
2. Habit and Habitat of Scoliodon: The shark is a marine, carnivorous and predaceous animal. It eats small pelagic schooling and bottom living bony fishes, including anchovies, codlet (Bregmacero-tidae), burrowing gobies (Tripauchenidae) and Bombay ducks (Harpadontidae) as well as shrimps and cuttle fish.
How big is the Scoliodon shark at birth?
When reproducing, the female is mostly Ovoviviparous,- Scolion laticuadus has a minimum of 8 to a maximum of 19 embryos when conceiving. At birth, the Scolion laticaudus is roughly 13.7 cm in length. Because of limited fecundity, the Scoliodon genus of sharks can be negatively affected by targeted fishing and habitat degradation.