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

Organisms that bore Mongolitubulus-like projections include trilobites, bradoriid arthropods and hallucigeniid lobopodians.

[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.