Diagrams of the cirrus of the species of Temnocephala associated with trichodactylid crabs. Terminology based on the cirrus structure (see comparative notes and Fig. 5). A Temnocephala ivandarioi sp. nov. (present study) B Temnocephala lanei Pereira & Cuocolo, 1941 C Temnocephala longivaginata Seixas, Amato & Amato, 2011 DTemnocephala lutzi Monticelli, 1913 (Amato et al. 2005) E Temnocephala microdactyla Monticelli, 1903 FTemnocephala pignalberiae Dioni, 1967 (Amato et al. 2010) G Temnocephala santafesina Dioni, 1967 H Temnocephala trapeziformis Amato, Amato & Seixas, 2006 I Temnocephala travassosfilhoi Pereira & Cuocolo, 1941. Key: Shaft [shape: CO–cone; FU–funnel]; [curvature: CU–curved up; ST–straight; CD–curved down]. Introvert [shape: CY–cylindrical; CO–cone; SC–scoop]; [armed with: UN–unarmed; SP–spines; SL–sclerites; RI–ridges; ND–not described]; [angle: NO–not oblique; VO–very oblique]; [curvature: NC–not curved; FC–forward curved; BC–backward curved].