irregular echinoid

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Echinoderm — Temporal range: Cambrian–recent … Wikipedia
Dendraster excentricus — Eccentric Sand Dollar or Western Sand Dollar Ganges Harbour, BC Scientific classification Kingdom: Ani … Wikipedia
Jurassic Period — Interval of geologic time, 206–144 million years ago, that is one of the three major divisions of the Mesozoic Era, preceded by the Triassic Period and followed by the Cretaceous. During the Jurassic, Pangea began to break up into the present day … Universalium
Menuha Formation — Stratigraphic range: Upper Cretaceous (Santonian) … Wikipedia
Sea urchin — Taxobox name = Sea urchin image width = 250px image caption = Sea urchins, Sterechinus neumayeri regnum = Animalia phylum = Echinodermata subphylum = Echinozoa classis = Echinoidea classis authority=Leske, 1778 subdivision ranks = Subclasses… … Wikipedia
echinoderm — /i kuy neuh derrm , ek euh neuh /, n. any marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea … Universalium

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