Geographic distribution of the three species studied.

(A) Map of Costa Rica illustrating the type locality of Principapillatus hitoyensis gen. et sp. nov. in the Reserva Biológica Hitoy Cerere (red circle) and the collecting site of Epiperipatus biolleyi in Cascajal de Coronado (green square). (B) Map of Thailand indicating the location of the Chanthaburi Mountain Range (blue triangle) from which specimens of Eoperipatus sp. were obtained.