Cf. Klitzke et Ks. Brown, The occurrence of aristolochic acids in neotropical troidine swallowtails (Lepidoptera : Papilionidae), CHEMOECOLOG, 10(2), 2000, pp. 99-102
Analysis of individuals of 17 troidine species demonstrated the presence of
aristolochic acids in these butterflies in varying concentrations. Althoug
h aristolochic acids do not occur in Aristolochia galeata leaves, they were
present in Battus polydamas larvae reared on these leaves, and thus may be
synthesized by the larvae from chemical precursors in the plant.