Caudal Fins

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14 Terms

1
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Homocercal fin

symmetrical caudal fin where the upper and lower lobes are roughly equal in size

- vertebral column ending near the middle of the caudal base rather than extending into the fin

<p><mark data-color="unset" style="background-color: unset; color: inherit;">symmetrical caudal fin where the upper and lower lobes are roughly equal in size</mark></p><p><mark data-color="unset" style="background-color: unset; color: inherit;">- vertebral column ending near the middle of the caudal base rather than extending into the fin</mark></p>
2
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Lunate caudal fin

Crescent shaped forked tail for fast swimming pelagic fishes

-Homocercal

<p>Crescent shaped forked tail for fast swimming pelagic fishes</p><p>-Homocercal</p>
3
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Forked caudal fin

V-shaped fin in many pelagic fishes that need sustained swimming

-Homocercal

<p>V-shaped fin in many pelagic fishes that need sustained swimming</p><p>-Homocercal</p>
4
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Emarginate caudal fin

slight inward curve

-Homocercal

<p>slight inward curve</p><p>-Homocercal</p>
5
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Truncate

mostly straight/ cubed off

-Homocercal

<p>mostly straight/ cubed off</p><p>-Homocercal</p>
6
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Rounded caudal fin

circular/ smooth edged to allow for short quick bursts

-Homocercal

<p>circular/ smooth edged to allow for short quick bursts</p><p>-Homocercal</p>
7
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Protocercal

primitive undifferentiated; rays extend around end of notochord; found in lampreys, and most larvae

<p>primitive undifferentiated; rays extend around end of notochord; found in lampreys, and most larvae</p>
8
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heterocercal fin

tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe

-Chondrichthyes and primitive bony fishes (sturgeons - Acipenseridae)

<p>tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe</p><p>-Chondrichthyes and primitive bony fishes (sturgeons - Acipenseridae)</p>
9
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Abbreviated heterocercal

vertebral column turns upward into the caudal fin, but only partially extends into it, creating a tail that is more symmetrical than a truly heterocercal tail

<p>vertebral column turns upward into the caudal fin, but only partially extends into it, creating a tail that is more symmetrical than a truly heterocercal tail</p>
10
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Hypocercal

Caudal fin with lower lobe being larger than upper lobe

-eg flying fish

<p>Caudal fin with lower lobe being larger than upper lobe</p><p>-eg flying fish</p>
11
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diphycercal caudal fin (leptocercal)

tail similar to the protocercal, but secondarily derived; vertebral column extends straight back to end of caudal fin, dividing into symmetrical parts (2 or 3 lobes); found in lungfishes (Dipnoi)

<p>tail similar to the protocercal, but secondarily derived; vertebral column extends straight back to end of caudal fin, dividing into symmetrical parts (2 or 3 lobes); found in lungfishes (Dipnoi)</p>
12
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Isocercal

last vertebra modified as a flattened plate; found in cods

<p>last vertebra modified as a flattened plate; found in cods</p>
13
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Gephyrocercal

"bridge tail" no hypural plate

Dorsal and anal fins have grown around

posterior end of fish

-not true caudal fin

<p>"bridge tail" no hypural plate</p><p>Dorsal and anal fins have grown around</p><p>posterior end of fish</p><p>-not true caudal fin</p>
14
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hypural plate

internal structure that marks the end of the vertebral column

<p>internal structure that marks the end of the vertebral column</p>