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Holectypoida
Order of sea urchins From Wikipedia, the free encyclopedia
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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.
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Description and characteristics
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
According to World Register of Marine Species:
- †Anorthopygidae Wagner & Durham, 1966
- †Coenholectypidae Smith & Wright, 1999
- Discoididae Lambert, 1900
- †Holectypidae Lambert, 1900
References
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