Mongolitubulus is a form genus encapsulating a range of ornamented conical small shelly fossils of the Cambrian period.

It is potentially synonymous with Rushtonites, Tubuterium and certain species of Rhombocorniculum, and owing to the similarity of the genera,[1][4][5] they are all dealt with herein.

[5] Spines vary from sub-millimetric up to two centimetres in length, but do not show any growth lines, suggesting that they were moulted and replaced.

[7] This speculative claim has been substantiated for some material attributed to Mongolitubulus, based on similarities with the spines of the hallucigeniid lobopodians.

[16] Mongolitubulus is known from the Botomian to the lower strata of the Middle Cambrian,[1] and have a worldwide distribution,[7] being found on every continent including Antarctica.