, Volume 17, Issue 3, pp 131-138

Hydroquinones from defensive secretion of a giant Pacific millipede, Acladocricus setigerus (Diplopoda: Spirobolida)

  • Xiaogang WuAffiliated withDepartment of Chemistry and Chemical Biology, Stevens Institute of Technology
  • , Donald W. BudenAffiliated withDivision of Natural Sciences and Mathematics, College of Micronesia-FSM
  • , Athula B. AttygalleAffiliated withDepartment of Chemistry and Chemical Biology, Stevens Institute of Technology Email author 

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The presence of considerable quantities of hydroquinones including hydroquinone, 2-methylhydroquinone, 2,3- dimethoxyhydroquinone, 2-methoxy-3-methylhydroquinone, and 2,3-dimethoxy-5-methylhydroquinone renders the defensive secretion of Acladocricus setigerus (Silvestri, 1897) significantly different from that of other quinone-producing millipedes. In addition, two hitherto undescribed compounds, namely, 2,3-dimethoxy-5-methylhydroquinone and 2-methyl-3,4-methylenedioxyphenol, were characterized from the defensive secretion. However, it is uncertain if the latter compound is formed after the release of the secretion. The two major compounds, 2-methyl-1,4-benzoquinone and 2-methoxy-3-methyl-1,4-benzoquinone, constitute about 75% of the defensive fluid. Furthermore, hydrocarbons, which are typically present in the secretions of most other arthropods that use benzoquinones as repellents, are notably absent in the secretion of A. setigerus.


Chuuk Micronesia millipede Acladocricus setigerus chemical defense benzoquinones hydroquinones 2,3-dimethoxy-5-methylhydroquinone 2-methyl-3,4-methylenedioxyphenol