Chris,

Another new non-native has just been reported on Facebook, this being the marine mollusc (Gastropod)  - Cerithium litteratum (Born, 1778) found in Cornwall - see below.

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Steve Trewhella added photos to new record in The Essential Guide to Beachcombing and the Strandline.
1 hr ·

Last week Tracey Williams found a Scotty bait pot on a beach near Newquay Cornwall , it contained 10 shells of Cerithium litteratum (Born, 1778), a Caribbean species never before seen on UK mainland shores.  The snails would have entered the pot as larvae , living on algae growing on the inside.  Scotty pots are always worth closer examination .

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See:  https://en.wikipedia.org/wiki/Cerithium_litteratum

and:  http://species-identification.org/speci … amp;id=407

Obviously, this species is not on the UKSI and if the findings are to be recorded it will need to be.

Cheers,
Steve