Fossile de crinoïde, les crinoïdes sont un groupe fossile ancien apparu pour la première fois dans les mers de la période Cambrienne moyenne. Fossiles de pierres marocains

• Contributeur: MediaWorldImages / Alamy Banque D'Images
• ID de l’image: CX9C3Y
• Taille du fichier: 50 MB (2,1 MB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 5120 x 3413 px | 43,3 x 28,9 cm | 17,1 x 11,4 inches | 300dpi
• Date de la prise de vue: 16 septembre 2012

Informations supplémentaires

Crinoids are marine animals that make up the class Crinoidea of the echinoderms (phylum Echinodermata). Crinoidea comes from the Greek word krinon, "a lily", and eidos, "form".They live both in shallow water and in depths as great as 6, 000 meters. Sea lilies refer to the crinoids which, in their adult form, are attached to the sea bottom by a stalk. Feather stars, or comatulids refer to the unstalked forms. Crinoids are characterized by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth. Although the basic echinoderm pattern of fivefold symmetry can be recognized, most crinoids have many more than five arms. Crinoids usually have a stem used to attach themselves to a substrate, but many live attached only as juveniles and become free-swimming as adults.

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