Fig 1.

Adult insects and symbiotic organs of cydnid stinkbugs. (A) Adult insect of Macroscytus japonensis; (B) adult insect of Adomerus triguttulus; (C) dissected midgut from an adult female of M. japonensis; (D) dissected midgut from an adult female of A. triguttulus. M1, midgut first section; M2, midgut second section; M3, midgut third section; M4, midgut fourth section (symbiotic organ); HG, hindgut; MT, Malpighian tubule. (E) In situ hybridization of the gut symbiont in the midgut fourth section of M. japonensis; (F) in situ hybridization of the gut symbiont in the midgut fourth section of A. triguttulus. Each arrowhead indicates a crypt. Red and blue signals indicate the symbiont 16S rRNA and the host nuclear DNA, respectively.