Which of the fishes have Homocercal tail?

Teleosts (ray finned fishes) and lungfishes have a place with class Osteichthyes. They have a homocercal tail however lungfishes are lobed fin fishes. Sharks and beams have a place with class Chondrichthyes and have a heterocercal tail.

Which of the following fishes have Homocercal tail?

Teleosts possess a homocercal tail, a tail which has equal upper and lower halves. The great abundance of some large species, such as the tunas, and of smaller species, such as the various herrings, made teleost fishes extremely important to humankind as a food supply. Hence, option A is the correct answer.

What is Homocercal tail?

In fish, a tail in which the last vertebra adjoins modified bony elements (the urostyle and hypurals) which support the fin rays in such a manner that the tail fin outwardly appears symmetrical. The homocercal tail fin is typical of the higher bony fish.

In which fish Heterocercal tail fin is found?

The heterocercal tail is present in many fossil fish, in the sharks (Chondrichthyes), and in the more primitive bony fish, e.g. the families Acipenseridae and Polyodontidae.

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Do sharks have a Heterocercal tail?

Tail. The tail of a shark consists of the caudal peduncle and the caudal fin, which provide the main source of thrust for the shark. Most sharks have heterocercal caudal fins, meaning that the backbone extends into the (usually longer) upper lobe.

How many gills are present in cartilaginous fish?

Bony fish Cartilaginous fish
They have 4 pairs of gills. They have 5-7 pairs of gills.
Cloacal aperture is absent. Cloacal aperture is present.
Exoskeleton is made up of cycloid scales. Exoskeleton is made up of Placoid scale.
They are ovoviviparous or viviparous. They are viviparous.

How do Placoid scales grow?

Placoid scales are packed tightly together, are supported by spines, and grow with their tips facing backward and laying flat. Placoid scales are rough to the touch and the structure they form is nearly impossible to penetrate.

Do Homocercal tail is found in?

Complete answer: The homocercal tail is a tail wherein the upper and lower flaps of the tail are practically even and the vertebral segment closes at the center of the base. It is found in class Osteichthyes.

What is the difference between Heterocercal and Homocercal tails?

What is the difference between a heterocercal and homocercal tail? A heterocercal tail is long and thin, such as a common shark tail. A homocercal tail has an even groove, like that on a regular fish.

What is the purpose of a Heterocercal tail?

First, the classical model of locomotion in sharks proposes that the heterocercal tail functions by transmitting posteroventral momentum to the water during steady horizontal swimming, thereby producing an anterodorsal reaction force(Alexander, 1965; Ferry and Lauder, 1996; Lauder, 2000).

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What are the fins on a fish called?

Fins: Help a fish move. The top fins are called dorsal fins. … The bottom fin at the back of the fish is called the anal fin. The tail fin is called the caudal fin. Pectoral and pelvic fins come in pairs.

What will happen to a fish without its fin?

In most cases, fish will regrow their fins and tails, often looking just as good as the originals in most cases. However, if you let fin rot go on too long — and it does progress quickly — more serious infections can set in and kill the fish.

What type of tail is found in chondrichthyes?

Cartilaginous fish also have thick, fleshy fins, unlike bony fish. The tail of cartilaginous fish is also distinctive: the tail is divided into two lobes, and the vertebrae extend into the upper lobe, which is elongated past the lower half. Such a tail is called heterocercal.

What Shark has the largest Heterocercal tail?

Named for their exceptionally long, thresher-like heterocercal tail or caudal fins (which can be as long as the total body length), thresher sharks are active predators; the tail is used as a weapon to stun prey. The thresher shark has a short head and a cone-shaped nose.

Are sharks eyes?

Get eye-to-eye with a shark. A shark’s eyes are almost on completely different sides of its head, so the shark has a nearly 360-degree field of vision. A shark’s eye is similar to the eye of other vertebrates, with many parts that we’d recognize: a lens, a retina, an iris and a cornea. …

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Can Sharks survive without fins?

The sharks are often still alive when discarded, but without their fins. Unable to swim effectively, they sink to the bottom of the ocean and die of suffocation or are eaten by other predators. … Some countries have banned this practice and require the whole shark to be brought back to port before removing the fins.

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