Holectypoida
From Infogalactic: the planetary knowledge core
Holectypoida |
|
---|---|
Echinoneus cyclostomus | |
Scientific classification | |
Kingdom: | |
Phylum: | |
Class: | |
Superorder: | |
Order: |
Holectypoida
Duncan, 1889
|
Family: |
Echinoneidae
Agassiz, 1847
|
Genera | |
Lua error in Module:Taxonbar/candidate at line 22: attempt to index field 'wikibase' (a nil value).
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 Anorthopygidae Wagner & Durham, 1966b †
- family Coenholectypidae Smith & Wright, 1999 †
- family Discoididae Lambert, 1900
- family Holectypidae Lambert, 1900 †
References
- Lua error in package.lua at line 80: module 'strict' not found.
<templatestyles src="Asbox/styles.css"></templatestyles>