<p>Data for China are updated from the review by Williams 1998 using the IAB collection, and exclude records for known introductions (New Zealand, South America, Iceland). The grid is based on longitudinal intervals of 10°, which are used to calculate graduated latitudinal intervals to provide equal-area cells (each cell of area approximately 611,000 km²). Grey scale (right) with equal-interval richness classes. Cylindrical orthomorphic projection (excluding Antarctica) with north at the top of the map.</p
