[4] It was first described by S. Stillman Berry in 1921[3] based on a specimen found in St. Vincent Bay in South Australia.

[2] They are mostly found in sandy habitats in shallow,[6] sheltered waters[2] at depths up to 65 meters.

[6] Its diet is mostly composed of small fish and crustaceans, including amphipods[3] and especially benthic isopods.

[2] S. austrinum reproduce from a young age;[3] immature females can also store sperm.

[8] Males pass sperm packages to the female, who stores them in a pouch below her mouth.