(A–B) Measurements studied. (A) Measurements used to study Cichlidogyrus spp. and Scutogyrus spp. DB dorsal bar: h, length of dorsal bar auricle; w, dorsal bar maximum width; x, dorsal bar total length; y, distance between auricles; z, dorsal bar base end length. A anchor: a, anchor total length; b, anchor blade length; c, anchor shaft length; d, anchor guard length; e, anchor point length. Vg vagina: x, vagina total length, w, vagina maximum width. MCC male copulatory complex: Ap, accessory piece straight length; St, stalk length; He, heel straight length; Pe, penis: x, penis total curved length; w, penis maximum width. Pl auxiliary plate: x, auxiliary plate total length; w, auxiliary plate maximum width. H hook straight length. VB ventral bar: w, ventral bar maximum width; x, length of one ventral bar branch. (B) Measurements used to study Enterogyrus spp. VB ventral bar: x, length of one ventral bar branch; w, ventral bar maximum width. A anchor: a, anchor total length; b, anchor blade length; c, anchor shaft length; d, anchor guard length; e, anchor point length. Pe penis: x, penis total curved length; w, penis base maximum width.