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Holectypoida

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Holectypoida
Temporal range: Lower Jurassic–recent
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Subclass: Euechinoidea
Infraclass: Irregularia
Order: Holectypoida
Duncan, 1889
Families[1]

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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

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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.[2]

Taxonomy

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According to World Register of Marine Species:

References

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  1. ^ "Holectypoida". WoRMS. World Register of Marine Species. Retrieved 29 July 2024.
  2. ^ Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.