Rhombocorniculum

Rhombocorniculum is a species of small shelly fossil comprising twisted ornamented cones. It has been described from the Comley 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.

Taxonomy

Three species are recognized — in stratigraphic succession: R. insolutum, R. cancellatum, and R. spinosus. Landing refers R. insolutum to the strictocorniculids, along with Rushtonites. Hinz considers insolutum to fall within the variability seen in cancellatum.

Affinity

Based on details of the ornament and construction, Rhombocorniculum is interpreted as the spines of a Hallucigenia-like lobopodian worm.