A poisonous noble false widow spider has been found in a greenhouse in Marazion.
The spiders, which hit the headlines last year as the UK's most venomous species, have been known to bite humans, with the effects similar to that of a bee sting.
The Marazion arachnid was discovered by Dr Malcolm Brown, who said: "I don't mind spiders, but I didn't like the look of this one as it had a whitish mark on its back.
"I took a picture of it and sent it off to the Natural History Museum."
The experts at the museum quickly identified it as a noble false widow, and advised Dr Brown that he should not be too worried by his greenhouse guest.
He said: "This species has been mentioned in a number of recent media reports.
"The expert said that there is no need to panic as this is not a 'deadly' spider by any stretch of the imagination, but they are known to bite but typically the bite is no worse than a wasp sting.
"However, people who are particularly allergic may suffer an adverse reaction and in that case are advised to contact their doctor or A&E without delay."
The noble false widow is believed to have been resident in the UK for more than a century, having first arrived on boats into the south of England.
They have since spread north, and can now be found almost anywhere south of Scotland.