Mixosiphonata

{{Short description|Extinct order of nautiloids}}

{{Automatic taxobox

| fossil_range = {{fossil range|346.7|113.0|Mississippian-Early Cretaceous}}

| taxon = Mixosiphonata

| authority = Mutvei, 2017{{cite journal |last=Mutvei |first=H. |date=2017 |title=The new order Mixosiphonata (Cephalopoda: Nautiloidea) and related taxa; estimations of habitat depth based on shell structure |journal=GFF |volume=139 |issue=3 |pages=219–232 |doi=10.1080/11035897.2017.1330278|bibcode=2017GFF...139..219M }}

| subdivision_ranks = Genera

| subdivision =

• †Boggyoceras
• †Ctenobactrites?
• †Zhuravlevia

}}

Mixosiphonata is an extinct order of nautiloids that lived from the Carboniferous to the Early Cretaceous. It currently includes the genera Boggyoceras, Zhuravlevia, and possibly Ctenobactrites. They were the latest surviving orthoconic nautiloids, which had otherwise gone extinct in the Late Triassic.{{cite journal |last=Doguzhaeva |first=L.A. |date=1994 |title=An Early Cretaceous orthocerid cephalopod from north-western Caucasus |journal=Palaeontology |volume=37 |issue=4 |pages=889–899 |url=https://www.palass.org/publications/palaeontology-journal/archive/37/4/article_pp889-899}}