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HETEROCERCAL CAUDAL FIN [5 records]

Record 1 2021-06-08

English

Subject field(s)
  • Animal Anatomy
  • Fish
DEF

An internally and externally symmetrical tail (caudal) fin

CONT

Polypteriformes(bichirs and reedfish) possess a secondarily derived, externally symmetrical diphycercal caudal fin with several notable characteristics, including the inclusion of pterygiophores originating from the dorsal fin; this organization differs significantly both from other actinopterygians and from the ancestral heterocercal caudal fin shape...

French

Domaine(s)
  • Anatomie animale
  • Poissons

Spanish

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Record 2 2021-06-08

English

Subject field(s)
  • Animal Anatomy
  • Fish
CONT

A homocercal tail is a caudal fin composed of two lobes of equal proportion. Homocercal tails are the most common caudal fin type in fish but can come in many symmetrical shapes. A homocercal tail is contrasted with a heterocercal tail which has unequal lobes.

French

Domaine(s)
  • Anatomie animale
  • Poissons
CONT

La plupart des actinoptérygiens modernes ont une queue homocerque, c'est-à-dire que le lobe du haut et le lobe du bas sont presque égaux et symétriques, comme par exemple la queue du saumon. Par contre, [les espèces du genre] Cheirolepis avaient une queue épicerque, c'est-à-dire que l'axe de [leur] corps se poursuivait dans un lobe supérieur plus développé.

Spanish

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Record 3 2021-06-08

English

Subject field(s)
  • Animal Anatomy
  • Fish
DEF

[A] tail fin where the lower lobe is the longer and is supported by the vertebral column.

OBS

Asymmetrical externally as well as internally.

French

Domaine(s)
  • Anatomie animale
  • Poissons
CONT

Les «thélodontes» ont une nageoire caudale hypocerque, comme les anaspides (et les lamproies).

Spanish

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Record 4 2021-05-25

English

Subject field(s)
  • Animal Anatomy
  • Fish
CONT

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.

French

Domaine(s)
  • Anatomie animale
  • Poissons

Spanish

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Record 5 2004-05-12

English

Subject field(s)
  • Paleontology
OBS

[In the heterocercal] type of caudal fin [, which is] common in more primitive fish,... the body, containing the backbone, tips up posteriorly, and nearly all the development of the fin takes place beneath.

French

Domaine(s)
  • Paléontologie
OBS

[...] chez les Poissons [...] [le type hétérocerque de nageoire caudale] se rencontre communément dans les formes les plus anciennes [...]. [Dans ce type] la colonne vertébrale se redresse vers le haut, et c'est en dessous de ce prolongement que la nageoire caudale prend son plus grand développement.

Spanish

Campo(s) temático(s)
  • Paleontología
DEF

[Refiérese a la] aleta natatoria caudal de lóbulos asimétricos.

Save record 5

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