Welcome strangers: Southern range extensions for seven heterobranch sea slugs (Mollusca: Gastropoda) on the subtropical east Australian coast, a climate change hot spot

The south eastern Australian coast is a recognised climate change hot spot and, as a result, poleward shifts in distribution are expected for many taxa. Between March 2015 and January 2016, we observed seven species of sea slug south of their previously recorded range. Each species has <10 records from the eastern Australian coast, four are first observations for the state of New South Wales and two represent southernmost records for the southern hemisphere. As such, these records form an important base for detecting any further shifts in range.