Synonymer

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Definitioner

Substantiv

  1. Any echinoderm of the order Clypeasteroida, having a flat, disk-shaped body with the mouth in a mid-ventral position, and living in sand, on or near the surface.

Exempel

  • In the sand dollars, the arrangement of the food grooves and consequently the lateral water vessels and their accessory tube feet is more complex (Phelan 1977).
  • Adult echinoderms have a five-part body plan corresponding to the arms of a sea star or the design on the "shell" of a sand dollar.
  • If you look carefully, a sand dollar is merely a sea urchin in flattened form.

Böjningsformer

Pluralsand dollars

Kategorier