Hyolithohelminths are phosphatic tubular fossils from the Cambrian period. They were sedentary, possibly infaunal, organisms; once thought to have opercula (hence the comparison with hyoliths), these structures are now understood to be unrelated shells.[1]
| Hyolithelmintida Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | incertae sedis |
| Order: | †Hyolithelmintida |
References
edit- ^ a b William Schopf, J.; Klein, Cornelis (1992-06-26). The Proterozoic Biosphere: A Multidisciplinary Study. ISBN 9780521366151.
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