Sepia plana

{{Short description|Species of cuttlefish}}

{{Use dmy dates|date=July 2019}}

{{Speciesbox

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Barratt, I. |author2=Allcock, L. |date=2012 |title=Sepia plana |volume=2012 |page=e.T162515A907492 |doi=10.2305/IUCN.UK.2012-1.RLTS.T162515A907492.en |access-date=20 November 2021}}

| taxon = Sepia plana

| authority = Lu & Reid, 1997{{cite web | url = http://www.marinespecies.org/aphia.php?p=taxdetails&id=438909 | title = Sepia plana Lu & Reid, 1997 | access-date = 12 February 2018 | publisher = Flanders Marine Institute | author = Julian Finn | year = 2016 | work = World Register of Marine Species}}

| synonyms =

}}

Sepia plana is a species of cuttlefish native to the coast of Australia, specifically the North West Shelf ({{coord|12|04|S|122|59|E|scale:250000}} to {{coord|17|55.5|S|118|16.0|E|scale:250000}}). However, cuttlebones of this species have also been found off eastern Australia, suggesting that it may have a wider distribution. S. plana lives at depths of between 396 and 505 m.Reid, A., P. Jereb, & C.F.E. Roper 2005. Family Sepiidae. In: P. Jereb & C.F.E. Roper, eds. Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae). FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 57–152.

S. plana exhibits sexual dimorphism, as females grow considerably larger than males. They reach a mantle length of 151 mm and 99 mm, respectively.

The type specimen was collected in the North West Shelf, western Australia ({{coord|14|15|S|121|59|E|scale:250000}}). It is deposited at the Museum of Victoria in Melbourne.[http://www.mnh.si.edu/cephs/newclass.pdf Current Classification of Recent Cephalopoda]