Holectypoida

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Holectypoida
Temporal range: Lower Jurassic–recent
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Superorder: Gnathostomata
Order: Holectypoida
Duncan, 1889
Family: Echinoneidae
Agassiz, 1847
Genera

Echinoneus
Micropetalon

The Holectypoida are an order of sea urchins related to the sand dollars. The order consists of just two living genera, but was once more diverse.

Description and characteristics[edit]

In appearance, the living holectypoids are similar to sand dollars, but with less flattened bodies and an oval outline. They also lack the petal-like patterns found on the bodies of sand dollars.

Taxonomy[edit]

According to World Register of Marine Species :

References[edit]

  • Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.