FIGURE 6. Species distribution of Anillinus in the eastern USA and factors shaping the genus diversity. A—total species number and number of endemics per state in the territory to the east of the Mississippi River (only described species included in Bousquet 2012, Sokolov 2012, 2014). Here and elsewhere state abbreviations follow Federal Information Processing Standards (https://www.nlsinfo.org/content/ cohorts/nlsy79/other-documentation/codebook-supplement/nlsy79-attachment-102-federal); B—species compositions in accordance with their habitat preferences in the three most speciose states of the E USA; C—biplot graph with clusters of states grouped on the basis of state species compositions using PCA analysis (explanation in the text). Green lines—projections of loadings of the following variables: ComEnd—number of common endogean species, ComLitnumber of common litter species, EndEnd—number of endemic endogean species, EndLit—number of endemic litter species, EndTrogl—number of endemic troglobitic species.