What is the meaning of Heterocercal tail? 1 of a fish tail fin : having the upper lobe larger than the lower with the vertebral column extending into the upper lobe.
What is Heterocercal fins? Definitions of heterocercal fin. a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks. Antonyms: homocercal fin. symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes. type of: caudal fin, tail fin.
What is Heterocercal tail example? The heterocercal tail of a shark is a caudal fin with unequal lobes. 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.
What is the difference between Heterocercal and Homocercal tails? 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 meaning of Heterocercal tail? – Related Questions
Who has Heterocercal tail?
All of the above. Hint: The tail of shark is heterocercal as its upper lobe is larger than the lower lobe. In the homocercal tail the both lobes are the same.
What is the tail fin called?
The tail fin (called the caudal fin) is the main source of movement for most fish.
Do all chondrichthyes have Heterocercal tails?
As you may have guessed from the name, members of the Chondrichthyes have a cartilaginous skeleton. 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 is the function 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).
Where is a dorsal fin?
A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom.
What are Placoid scales?
Placoid scales (or denticles) are spiny, toothlike projections seen only in cartilaginous fishes. Ganoid scales, sometimes considered a modification of the placoid type, are chiefly bony but are covered with an enamel-like substance called ganoin.
What type of movement does a Heterocercal tail create?
The caudal fin of leop- ard sharks functions in a manner consistent with the classical model of heterocercal tail function in which the caudal surface moves at an acute angle to the horizontal plane, and hence is expected to generate lift forces and torques which must be counteracted anteriorly by the body and pectoral
What kind of tail has even groove?
A homocercal tail has an even groove, like that on a regular fish.
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.
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.
What type of tail is found in Chimaera * 1 point?
The Chimaera was a vicious, bloodthirsty beast with a lion’s head, a goat’s body and a dragon’s tail.
What type of tail is Clasmobranch fish?
A. Dipnoi is the group of lungfishes which are bony fishes. These have homocercal tail in which caudal in is divided into similar lobes.
What is a shark’s tail called?
Shark tail fins, also called the caudal fins, are unique among all fishes. If you look at the top half of the fin, it is noticeably longer than the bottom half. This asymmetrical profile was common in many ancient fishes, but sharks are the only group to maintain the shape over a period of 350 million years.
What makes Chondrichthyes unique?
Key Features of Chondrichthyes
Resemble bony fish and terrestrial vertebrates in having jaws and paired appendages. An electroreceptive system is well developed. Endoskeleton entirely cartilaginous. No swim bladder or lung.
Are Chondrichthyes Amniotes?
Includes Myxini, Cephalaspidomorpha, Chondrichthyes, Osteichthyes, Amphibia. Amniotes – vertebrates that possess an amnion. Includes Reptilia, Aves, Mammalia.
Why are sharks cartilaginous fish?
Sharks, rays, skates, and chimaeras (also know as rat fishes) all have cartilaginous skeletons. Cartilage is less dense than bone, allowing sharks to move quickly through the water without using too much energy.
What is the function of tail?
Many land animals use their tails to brush away flies and other biting insects. Some species, including cats and kangaroos, use their tails for balance; and some, such as monkeys and opossums, have what are known as prehensile tails, which are adapted to allow them to grasp tree branches.
What is meaning of Homocercal?
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. 2 : having or relating to a homocercal tail fin.
What is the purpose of dorsal fin?
Dorsal fins. The dorsal fins increase the lateral surface of the body during swimming, and thereby provide stability but at the expense of increasing drag (see also BUOYANCY, LOCOMOTION, AND MOVEMENT IN FISHES | Maneuverability).
What is a dorsal fin made of?
The dorsal fin and flukes are composed of connective tissue, not bone. Other connective tissue, such as external ears, has been lost, and the male genitalia have moved internally.
What do Placoid scales do?
They provide protection from the environment and from predators. Sharks have placoid scales, bony, spiny projections with an enamel-like covering. These denticles are slanted toward the tail of the shark and help direct the flow of water around the shark’s body, reducing friction so it can swim with less effort.