A tropical sea slug that was found in UK waters for the first time could be evidence of warming seas affecting marine wildlife, an expert has warned.

Spurilla neapolitana is normally found in the Caribbean, Mediterranean and western Atlantic, but was discovered off the south coast of Cornwall last week.

Wildlife volunteer Charlotte Cumming took photos of the 10mm-long creature - sometimes called a hair curler slug - at Prisk Cove during a survey for a charity.