title: Pregnanes from defensive glands of a belostomatid bug.
abstract: The aquatic bug Abedus herberti (Hemiptera: Belostomatidae) secretes a mixture containing four pregnanes (desoxycorticosterone (I), pregnenolone (II), progesterone (III), and 3 alpha-hydroxy-pregn-5-en-20-one (IV)) from its cephalic glands. Pregnanes had previously been characterized from the defensive glands of aquatic beetles (Dytiscidae) and shown to be deterrent to fish. It may be specifically under predation pressure from fish that A. herberti and Dytiscidae evolved their comparable defenses.
authors.affiliation: Department of Chemistry, Lawrence University, Appleton, Wisconsin 54911.
authors.forename: J
authors.initials: J
authors.lastname: Lokensgard
authors.forename: R L
authors.initials: RL
authors.lastname: Smith
authors.forename: T
authors.initials: T
authors.lastname: Eisner
authors.forename: J
authors.initials: J
authors.lastname: Meinwald
mesh_terms: D000818:Animals; D008401:Gas Chromatography-Mass Spectrometry; D006430:Hemiptera / Q000737:chemistry*; D011278:Pregnanes / Q000737:chemistry*
chemical_list: D011278:Pregnanes