What does Heterocercal tail mean?
What does Heterocercal tail mean?
Definition of heterocercal 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 the difference between Heterocercal and Homocercal tails?
A homocercal tail is a caudal fin composed of two lobes of equal proportion. A homocercal tail is contrasted with a heterocercal tail which has unequal lobes.
What does Homocercal tail mean?
Definition 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.
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.
Do Dog fish have Heterocercal tail?
The spiny dogfish has the presence two spines, one immediately in front of each dorsal fin. The caudal fin is divided into two lobes: a larger dorsal lobe and a smaller ventral lobe. This type of tail is known as a heterocercal tail.
What do you mean by 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 Homocercal fin in zoology?
views 1,428,169 updated. 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. A Dictionary of Zoology.
What type of caudal fin is asymmetrical?
homocercal caudal fin
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 purpose of a Heterocercal caudal tail in sharks?
The caudal fin of leopard 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 is a Heterocercal caudal fin?
What is a heterocercal tail fin?
Definition of heterocercal 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
What is the meaning of heterocercal?
Definition of heterocercal. 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 the difference between heterocercal and ichthyology?
heterocercal – possessing a tail with the upper lobe larger than the lower and with the vertebral column prolonged into the upper lobe. ichthyology – the branch of zoology that studies fishes. homocercal – possessing a symmetrical tail that extends beyond the end of the vertebral column (as in most bony fishes)
What is the function of the heterocercal tail in sharks?
Function of the heterocercal tail in sharks: quantitative wake dynamics during steady horizontal swimming and vertical maneuvering. Its external morphology, heterocercal fins, type of scale and its highly vascularized swim bladder, place it as a primitive fish (Paramo, 1982).
