Rhombocorniculum

{{Short description|Extinct genus of shelled animals}}

{{Automatic taxobox

| fossil_range = {{Fossil range|Cambrian Stage 2|Cambrian Stage 3|postscript=insolutum, latest Tommotian to early Atdabanian; cancellatum, Late Atdabanian to Early Botomian|ref={{Cite journal| last1 = Brasier | first1 = M. D.| title = The succession of small shelly fossils (especially conoidal microfossils) from English Precambrian–Cambrian boundary beds| journal = Geological Magazine| volume = 123| issue = 3| pages = 237–256| year = 1986| doi = 10.1017/S0016756800034737| bibcode = 1986GeoM..123..237B}}}}

| taxon = Rhombocorniculum

| authority = Walliser, 1958{{cite journal|title=Rhombocorniculum comleyense n. gen., n. sp|author=Otto H. Walliser| doi=10.1007/BF02989029|volume=32|issue=3–4|pages=176–180|journal=Paläontologische Zeitschrift|year=1958|bibcode=1958PalZ...32..176W }}

| subdivision_ranks = Species

| subdivision =

}}

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.{{cite journal | last1 = Landing | first1 = E. | date = May 1995 | journal = Journal of Paleontology | volume = 69 | issue = 3 | pages = 475–495 | title=Upper Placentian-Branchian Series of Mainland Nova Scotia (Middle-Upper Lower Cambrian): Faunas, Paleoenvironments, and Stratigraphic Revision | jstor = 1306322| doi = 10.1017/S0022336000034879 | bibcode = 1995JPal...69..475L }}