Ostenoteuthidae

{{Short description|Extinct family of molluscs}}

{{Taxobox

| fossil_range = {{fossil range|Sinemurian}}

| image = Ostenoteuthis siroi.JPG

| image_caption = The holotype of Ostenoteuthis siroi. Visible features include 10 arms, jaw, gladius, gills, displaced ink sac and lateral wing. (See notes on the image.)

| regnum = Animalia

| phylum = Mollusca

| classis = Cephalopoda

| subclassis = Coleoidea

| ordo = incertae sedis

| familia = †Ostenoteuthidae

| familia_authority = Garassino & Donovan, 2000Garassino A. & Donovan D. T. (2000). "A New Family Of Coleoids From The Lower Jurassic Of Osteno, Northern Italy". Palaeontology 43(6): 1019-1038, 5 plates. {{doi|10.1111/1475-4983.00160}}. [http://www3.interscience.wiley.com/cgi-bin/fulltext/119037403/PDFSTART PDF]{{dead link|date=February 2019|bot=medic}}{{cbignore|bot=medic}}

}}

File:Ostenoteuthidae.jpg and Ostenoteuthis siroi.]]

Ostenoteuthidae is an extinct family of cephalopods from Lower Jurassic of Italy. They had ten arms with unusual structure.

Both known species are from Lower Sinemurian.

The type locality for up to date known two species is near village Osteno, Lake Lugano, Province of Como, northern Italy. Eight specimens from this family are stored in Museo Civico di Storia Naturale di Milano in Milan, Italy.