Polycidaridae

Polycidaridae
Description de cette image, également commentée ci-après
Paracidaris florigemma (Jurassique, MNHN).
Classification
Règne Animalia
Embranchement Echinodermata
Sous-embr. Echinozoa
Classe Echinoidea
Sous-classe Cidaroidea
Ordre Cidaroida
Super-famille Cidaroidea

Famille

† Polycidaridae
Vadet (d), 1988

Les Polycidaridae sont une famille éteinte d'oursins de l'ordre des Cidaroida.

Systématique

La famille des Polycidaridae a été créée en 1988 par le paléontologue français Alain Vadet (d)[1].

Caractéristiques

Ce sont des oursins réguliers : le test (coquille) est arrondi, avec le péristome (bouche) située au centre de la face orale (inférieure) et le périprocte (appareil contenant l'anus et les pores génitaux) à l'opposé, au sommet de la face aborale (supérieure).

Les tubercules primaires, volumineux, sont perforés et crénulés, avec un mamelon réduit. Les ambulacres sont droits. Les radioles primaires sont longues, de section ronde et portent des piquants secondaires[2].

Cette famille est apparue au Trias (Carnien) et a disparu au Crétacé (Néocomien)[2].

Liste des genres

Selon World Register of Marine Species (2 décembre 2021)[3] :

Publication originale

  • Alain Vadet, « Révision des principaux Cidaris de l'Oxfordien et du Kimmeridgien inférieur européens », Mémoires de la Société académique du Boulonnais, vol. 4,‎ , p. 1-148 (ISSN 0765-1511).Voir et modifier les données sur Wikidata

Références taxonomiques

Sur les autres projets Wikimedia :

Notes et références

  1. ↑ Valet 1988, p. 1-148
  2. ↑ a et b (en) « Polycidaridae », sur le site du Natural History Museum (consulté le )
  3. ↑ World Register of Marine Species, consulté le 2 décembre 2021

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