What does Homocercal mean in biology?

1 of a fish tail fin : having the upper and lower lobes approximately symmetrical and the vertebral column ending at or near the middle of the base. What is Homocercal and Heterocercal?
is that heterocercal is (ichthyology) of a fish’s tail, such that the vertebral column bends and extends upwards into the upper lobe of the tail, making it larger than the lower lobe; as in sharks, rays, and skates while homocercal is (ichthyology) describing the symmetric tail of a fish that has two lobes extending …

What is the difference between a Homocercal and a Heterocercal tail in fishes?

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 Homocercal tail?
Quick Reference. 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.

Why do sharks have Heterocercal tails?

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). What is Heterocercal tail example?

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.

Frequently Asked Questions(FAQ)

How do you pronounce Heterocercal?

What is the advantage of a Heterocercal tail?

The heterocercal tail is capable of delivering a thrust that can be oriented in a wide range of angles in the vertical plane. The orientation results from a balance of forces acting in the tail.

Which of the following fishes have Homocercal tail?

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. Teleosts (ray finned fishes) and lungfishes have a place with class Osteichthyes.

Why is the caudal fin asymmetrical?

The homocercal caudal fin is superficially symmetric, but internally asymmetric; the caudal part of the vertebral column tilts strongly upward so that the fin expanse is purely a ventral structure. The superficial symmetry rather resides in the exoskeletal portion, which is a feature of the dermal fin rays.

What is pectoral fin on fish?

What type of caudal fin is asymmetrical?

Teleosts have an internally-asymmetrical caudal fin, called the homocercal caudal fin, formed by the upward bending of the caudal-most portion of the body axis, the ural region.

What is the difference between cartilaginous and bony fish?

Technically, the most obvious disparity between bony vs cartilaginous fish comes from the fact that the skeleton of bony fish is made of bones alone, while that of cartilaginous fish is made of cartilage. There are more than 20,000 fish species in the world.

What is the difference between Homocercal and Heterocercal caudal fins?

A heterocercal fin has a dorsal lobe that is much larger than the ventral lobe, and the vertebral column extends up and into the dorsal lobe of the fin. … A homocercal fin has equally sized and dorsal and ventral lobes but with a reduced, narrowed vertebral column that supports the fins dorsal most edge.

What is a Heterocercal caudal fin?

A heterocercal tail is a caudal fin composed of two asymmetrical lobes. Often, such as the case in many sharks, the vertebral column passes through the upper lobe, making it the larger of the two lobes. A heterocercal tail is contrasted with a homocercal tail which has equal lobes.

What is the tail of a fish called?

Caudal fin Tail fin (Caudal fin) The tail fin (called the caudal fin) is the main source of movement for most fish.

Which fins are paired in fish?

Fins are composed of two groups, unpaired and paired. The unpaired fins are the dorsal, caudal, and anal; the paired fins are called pectorals and pelvics, or ventrals. Pectoral fins are present in almost every fish.

Will there be a Shark Tale 2?

Shark Tale 2 is an upcoming 2021 American sequel to Shark Tale It is set to be released on September 3, 2021. From the Creators of Shrek, Madagascar, Kung Fu Panda, How to Train your Dragon, The Croods, Home and Captain Underpants.

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.

Do sharks have Homocercal?

There are two types of caudal fin observed in sharks: heterocercal, where the top lobe is larger than the bottom; and homocercal, where lobes are symmetrical.

What is Heterocoel?

1 of a fish tail fin : having the upper lobe larger than the lower with the vertebral column extending into the upper lobe. 2 : having or relating to a heterocercal tail fin.

Does a perch have a Heterocercal tail?

The caudal (tail) fins of fish vary in their morphology. The perch exhibits a tail with two equal-sized lobes, but its vertebral column extends into the upper lobe. … However, like the perch, the shark’s vertebral column extends into the upper lobe, and this construction is known as heterocercal.

Do all chondrichthyes have Heterocercal tails?

Chondrichthyes have heterocercal tails and osteichthyes possess homocercal tail fins. Therefore, all of the given alternatives are true for the chondrichthyes different from osteichthyes. Thus, the correct answer is option d- all of these.

How do you pronounce Diphycercal?

How do you pronounce chondrichthyes?

How does a Heterocercal tail work?

The function of the heterocercal tail in sharks has long been debated in the literature. … Analysis of flow geometry indicates that the tail of both leopard and bamboo shark generates strongly tilted vortex rings with a mean jet angle of approximately 30 degrees below horizontal during steady horizontal swimming.