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AGNATHANS [2 records]

Record 1 2003-08-26

English

Subject field(s)
  • Paleontology
OBS

The early jawless fishes, the agnathans, are first known from late Cambrian fossils.

French

Domaine(s)
  • Paléontologie
OBS

Les écoles divergent pour la classification du groupe des Agnathes; certaines les considèrent comme les premiers Poissons sans mâchoires; d'autres les datent du Cambrien supérieur.

Spanish

Campo(s) temático(s)
  • Paleontología
DEF

Vertebrados pisciformes de la clase Agnatha que se caracterizan por carecer de mandíbulas, con arcos branquiales indiferenciados, y de extremidades pares.

Save record 1

Record 2 1995-10-03

English

Subject field(s)
  • Zoology

French

Domaine(s)
  • Zoologie
DEF

classe de vertébrés aquatiques, la plupart fossiles, caractérisés par l'absence de mâchoires et de membres pairs, la nudité des téguments et l'état rudimentaire du squelette

OBS

On distingue deux ordres : les Pétromyzonidés (lamproies) et les Myxinoides (myxines).

OBS

Du grec, a privatif, gnathos : mâchoires

Spanish

Campo(s) temático(s)
  • Zoología
Save record 2

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