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ARTHRODIRA [1 record]

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Record 1 2000-02-09

English

Subject field(s)
  • Fish
  • Paleontology
CONT

The name Arthrodira means "jointed neck" These advanced preditory placoderms had a movable joint between the head (cephalic) and the thoracic (body) armor ... The mouth is interesting because as the lower jaw moved down the head shield moved up, thus giving a wide gape. Like all placoderms, they lacked teeth, instead using the sharpened edges of a bony plate as a biting surface.

French

Domaine(s)
  • Poissons
  • Paléontologie
OBS

Les Arthrodires forment un vaste groupe multiforme de «Poissons». [...] il est clair qu'ils sont de vrais Gnathostomes, qu'ils appartiennent aux «Elasmobranchiomorphi» [...] et qu'ils sont surtout apparentés aux Holocéphales.

OBS

Exemple : «coccosteus» [...] du Dévonien moyen. Il a des «appendices pectoraux, mobiles, d'une seule pièce» [...] et une denture de «carnivore».

Spanish

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