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Rhombocorniculum : ウィキペディア英語版 | Rhombocorniculum
| authority = Walliser, 1958 }} ''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. == Taxonomy==
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''.
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