Male genitalia of Corydalus spp. A genitalia of holotype of C. ralphi sp. nov., dorsal view B genitalia of holotype of C. wanningeri Contreras-Ramos & von der Dunk, dorsal view C genitalia of holotype of C. ralphi sp. nov., ventral view D genitalia of holotype of C. wanningeri Contreras-Ramos & von der Dunk, ventral view. Scale bar: 1 mm. Abbreviations: ect, ectoproct; Gst 9, gonostylus 9; Gst 10, gonostylus 10; inv, invagination of membrane between segments 8 and 9; S8–9, sternites 8–9; T8–9, tergites 8–9.