 The ancestors of the modern P. luridipennis population would have been unable to survive on Lundy during the ice age . As such , the species must either be a relict species ( a species once more widespread ) , a species which is not unique to Lundy with other undiscovered populations , or the result of comparatively recent speciation on or near Lundy . One climactic and geological study suggests " that the ancestors of Lundy cabbage and its beetles may have had the opportunity to colonise Lundy across land during a few hundred years around 10 @,@ 800 years ago or may subsequently have been aided by [ now gone ] ' stepping stone ' land to the north east " of the island . 
