Holectypoida
| Holectypoida Temporal range:
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|---|---|
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| Scientific classification | |
| Kingdom: | |
| Phylum: | Echinodermata
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| Class: | Echinoidea
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| Superorder: | |
| Order: | Holectypoida Duncan, 1889
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| Family: | Echinoneidae Agassiz, 1847
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| Genera | |
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Echinoneus | |
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[]
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[]
According to World Register of Marine Species :
- family Wagner & Durham, 1966b †
- family Smith & Wright, 1999 †
- family Lambert, 1900
- family Lambert, 1900 †
References[]
- Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.
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Categories:
- Gnathostomata (echinoid)
- Extant Early Jurassic first appearances
- Echinoidea stubs