Southern little pipehorse

{{Short description|Species of fish}}

{{Speciesbox

| name = Southern little pipehorse

| image = Idiotropiscis australe.jpg

| image_caption =

| status = DD

| status_system = IUCN3.1

| status_ref = {{cite iucn | author = Pollom, R. |year = 2016 | title = Acentronura australe |errata=2017 | volume = 2016 | page = e.T61314A115204241 |doi = 10.2305/IUCN.UK.2016-3.RLTS.T61314A67618649.en }}

| taxon = Idiotropiscis australe

| authority = (Waite & Hale, 1921)

| synonyms = Acentronura australe Waite & Hale, 1921

| synonyms_ref =

}}

The southern little pipehorse (Idiotropiscis australe) is a species of fish in the family Syngnathidae. It is endemic to Australia. Its natural habitats are open seas, shallow seas, subtidal aquatic beds, and coral reefs.{{FishBase| genus=Idiotropiscis | species=australe | year=2013 | month=May }} It camouflages amongst species of red algae.Dianne J. Bray & Vanessa J. Thompson, 2011, Southern Pygmy Pipehorse, Idiotropiscis australe, in Fishes of Australia, accessed 16 Oct 2014, http://www.fishesofaustralia.net.au/home/species/4424 It is threatened by habitat loss.