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HOMOCERCAL [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 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 2 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 3 2004-01-06

English

Subject field(s)
  • Paleontology
CONT

[The "homocercal tail" fin is] externally more or less symmetrical but internally like a shortened heterocercal type; [it is] found in all higher fishes and derived during embryology from the heterocercal type.... It is seen that the tail fin is formed largely or wholly of the ventral part of the fin of the heterocercal tail with a great reduction or loss of the dorsal part. This ventral fin has become secondarily bilaterally symmetrical, so that the homocercal tail appears symmetrical externally.

French

Domaine(s)
  • Paléontologie
CONT

La nageoire caudale [des poissons] présente trois types principaux [dont le type "homocerque" où] la colonne vertébrale ne se prolonge pas dans la nageoire caudale aux deux lobes égaux [...]

CONT

Queue homocerque.

Spanish

Campo(s) temático(s)
  • Paleontología
DEF

[Dícese de la] aleta natatoria caudal de lóbulos simétricos.

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Record 4 1994-01-17

English

Subject field(s)
  • Paleontology
DEF

a genus(the type of the family Leptolepidae) of primitive clupeoid fishes that includes numerous small-scaled fishes with the tail nearly homocercal.

French

Domaine(s)
  • Paléontologie
DEF

Poisson généralement de petite taille, au corps allongé, couvert de minces écailles ganoïdes, avec une nageoire caudale à lobes égaux. (Fossile dans les terrains jurassiques et infracrétacés. Type de la famille des leptolépidés.)

Spanish

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