Identification and Function of Prothoracic Exocrine Gland Steroids of the Dytiscid Beetles Graphoderus cinereus and Laccophilus minutus

Abstract

The chemical composition of the prothoracic defensive secretion of the water beetles Graphoderus cinereus and Laccophilus minutus was examined by gas chromatographic–mass spectrometric analysis of trimethylsilylated gland extracts. The main components are 3α,11α-dihydroxy-5β-pregnan-20-one in G. cinereus and 3α,12α-dihydroxy-5β-pregnan20-one in L. minutus… (More)
DOI: 10.1023/A:1005570609835

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