id difficulty for Gnaphosa nigerrima
Identification difficulty rating=4
The Recording Scheme would require confirmation in the majority of cases, e.g. specimen having been checked by the appropriate Area Organiser or an acknowledged expert.
Males and females may present different identification difficulty in spiders. These identification ratings are based on the most difficult identification. New species may become recognised or become part of the British fauna e.g. from Europe, so identification should be made with the awareness that this is a possibility and that confirmation may be needed in the form of a voucher specimen.