Map of the South of eastern United States, showing positions of locality records for the newly described species of Anillinus and the ranges of their presumed relatives (localities of the same color reflect supposed relatedness). A. felicianus, green circle; A. relictus, red circle. Green area with vertical line pattern – range of A. sinuaticollis. Black cross – type locality of A. sinuatus. Red areas with diagonal line pattern – ranges of the species of Anillinus whose males have a spine-like structure in the endophallus of the median lobe (after Sokolov et al. 2004; Sokolov and Watrous 2008; Sokolov 2011; Sokolov et al. 2014; Sokolov et al. 2017). Blue line – Mississippi River. State abbreviations follow Federal Information Processing Standards (https://www.nlsinfo.org/content/cohorts/nlsy79/other-documentation/codebook-supplement/nlsy79-attachment-102-federal).