Great Britain and Ireland distribution - updated 26th June 2017. Please add your records here.
The distribution is based on a survey conducted during 1997 and published in the Journal of Zoology (download a pdf copy here). However, since this time, many more records have been reported from around Great Britain and Ireland and have been added to the map. To ensure confidentiality, record spots cover a 10km² area. The coverage is for Great Britain, Ireland and the surrounding islands. Records located in the sea are from oil rigs and boats with records being aligned into a block when the exact location is unknown.