Rhombocorniculum
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Rhombocorniculum Temporal range: Cambrian Stage 2–Cambrian Stage 3 |
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| Scientific classification | |
| Kingdom: | Animalia |
| Family: | †Hallucigeniidae |
| Genus: |
†Rhombocorniculum Walliser, 1958 |
| External identifiers for Rhombocorniculum | |
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| Encyclopedia of Life | 31729158 |
Rhombocorniculum is a species of small shelly fossil comprising twisted ornamented cones. It has been described from the Comely limestone and elsewhere. R. cancellatum straddles the Atdabanian/Botomian boundary. The structure of its inner layer suggests that its phosphatic fibres formed within a flexible organic matrix.
Three species are recognized — in stratigraphic succession: R. insolutum, R. cancellatum (=R. walliseri), and R. spinosus (=Rushtonites spinosus). Landing (1995) refers R. insolutum to the strictocorniculids, along with Rushtonites. Hinz (1987) considers insolutum to fall within the variability seen in cancellatum.
Based on details of the ornament and construction, Rhombocorniculum is interpreted as the spines of a Hallucigenia-like lobopodian worm.
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