In phytophagous sap-sucking insects. the precibarial valve plays an important role in sap ingestion. We used light and electron microspcopy to study the morphology and the ultrastructure of the precibarial valve of the meadow spittlebug. Philaenus spumarius (Hemiptera. https://parisnaturalfoodes.shop/product-category/magnesium-ctrate/