Orstenotubulus

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

{{Speciesbox

| fossil_range = Guzhangian

| image = Orstenotubulus.png

| image_caption = Reconstruction of Orstenotubulus

| genus = Orstenotubulus

| species = evamuellerae

| authority = Maas et al 2007 {{Cite journal | last1 = Maas | first1 = A. | last2 = Mayer | first2 = G. | last3 = Kristensen | first3 = R. M. | last4 = Waloszek | first4 = D. | title = A Cambrian micro-lobopodian and the evolution of arthropod locomotion and reproduction | doi = 10.1007/s11434-007-0515-3 | journal = Chinese Science Bulletin | volume = 52 | issue = 24 | pages = 3385 | year = 2007 | bibcode = 2007ChSBu..52.3385M | s2cid = 83993887 }}

}}

Orstenotubulus is a genus of lobopodian known from Orsten deposits of the latest 'middle' Cambrian (Miaolingian).Maas A, Waloszek D. 2001. Cambrian derivatives of the early arthropod stem lineage, pentastomids, tardigrades and lobopodians – an ‘Orsten’ perspective. Zoologischer Anzeiger 240: 451–459. It is believed by some to be an ancestor of the Tardigrades.