Fluazuron-induced morphological changes in Rhipicephalus sanguineus Latreille, 1806 (Acari: Ixodidae) nymphs: An ultra-structural evaluation of the cuticle formation and digestive processes

Ultrastructure of the midgut and integument of fluazuron-treated nymphs tick Rhipicephalus sanguineus. (A-E) Midgut. (F-I) Integument. (A, B and F) Control Group, (C and G) Group II (20 mg/kg), (D and H) Group III (40 mg/kg), and (E and I) Group IV (80 mg/kg). e, endosomes; hg, haematin residues; l, lipid; v, vacuoles; arrow, ruptured endosomes; enc, endocuticle; epc, epicuticle; epi, epithelium; exc, exocuticle; pc, procuticle; c, cuticle. Scale bars: A-I = 2μm.