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ENROULEMENT DISCOIDE [1 record]

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Record 1 1977-09-08

English

Subject field(s)
  • Paleontology
OBS

[Discoidal enrollment is] characteristic of certain progressive micropygous and isopygous ... [trilobites. In this mode] the thorax folds together in halves like a closing book. The flexion of the thorax is differential, being maximum in a comparatively short anterior stretch that acts as a sort of hinge, whereas it is very slight or none at all along the posterior segments.

French

Domaine(s)
  • Paléontologie
OBS

Dans le «mode [d'enroulement] discoïde» [...], le thorax [d'un Trilobite] se replie simplement en deux, comme un livre que l'on ferme, entraînant le pygidium qui vient s'appliquer contre la partie inférieure du céphalon. Il n'y a flexion du rachis que dans la zone de reploiement (= charnière d'enroulement) [...]; les extrémités de toutes les plèvres augmentent néanmoins leur courbure.

Spanish

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