Identification difficulty grades and their definitions for centipedes, millipedes, woodlice, waterlice and intertidal isopods.
Can be identified in the field by anyone with a little experience. Species with which the beginner rapidly becomes familiar. May be identifiable from a good photo. Records accepted from most sources.
Can be identified in the field with care and experience but needs a good view or examination with a good quality lens. Beginners should take voucher specimens until they gain familiarity and experience. Records accepted from known competent recorders.
Voucher specimen needs checking under magnification and good lighting. Beginners should get specimens checked at first until they gain experience. Records accepted from known experienced recorders without further question unless the date, region or habitat was especially unusual. Voucher specimen should be retained.
Adult voucher specimens of either one or both sexes need careful dissection. Records accepted from known experienced recorders familiar with the species. Voucher specimen should be retained. If the recorder is not familiar with the species then a voucher specimen should be checked by an expert who is.
Adult voucher specimens of either one or both sexes need careful dissection and to be examined by national expert. Even the most experienced of recorders may need to seek a second opinion from an acknowledged expert. Specimen may need to be submitted to experts elsewhere in Europe for comparison with a wider range of material.