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NEPIONIC [1 record]

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Record 1 2002-05-07

English

Subject field(s)
  • Paleontology
DEF

[Said of a] juvenile stage following an embryonic and forerunning an ephebic stage.

CONT

After the stomodaeum opened into the gut rudiment, new mineralized nepionic shell material with caeca, imbricated fibres and growth-disturbance lines, formed on the inner surface of the initial shell to thicken it and to extend peripherally beyond it.

French

Domaine(s)
  • Paléontologie
CONT

Le stade népionique. La coquille ne montre pas encore de caractère spécifique; les jeunes peuvent appartenir à plusieurs espèces [...]; la longueur finale (entre la pointe du crochet et l'extrémité de la languette) est de 15 mm au maximum [...]

CONT

Juste au niveau de la coquille népionique, le cuilleron postérieur de la charnière est tronqué, comme tranché, laissant devant lui une profonde échancrure.

Spanish

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