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1 December 2010 Benzoquinone-rich exudates from the harvestman Pachylus paessleri (Opiliones: Gonyleptidae: Pachylinae)
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Abstract

The chemical composition of the scent gland secretion of Pachylus paessleri Roewer 1913, a pachyline harvestman, was analysed by gas chromatography–mass spectrometry. The secretion is a six-component mixture of benzoquinones, with 2,3-dimethyl-1,4-benzoquinone and 2,3,5-trimethyl-1,4-benzoquinone being the main components (together amounting for ¾ of the secretion). Minor components are 2,5-dimethyl-1,4-benzoquinone (about 12%), 2-ethyl-3-methyl-1,4-benzoquinone (about 8%), 2,5-dimethyl-3-ethyl-1,4-benzoquinone (5%), and 2-ethyl-5-methyl-1,4-benzoquinone (about 1%). No sex-dependent differences could be detected. While dimethyl- and trimethyl-benzoquinones are widespread in scent gland secretions of Gonyleptoidea, 2,5-dimethyl-3-ethyl-1,4-benzoquinone and 2-ethyl-5-methyl-1,4-benzoquinone are reported for the first time in Opiliones. The phylogenetic implications of these compounds are briefly discussed in the scope of the present knowledge of Laniatores.

Petra Föttinger, Luis E. Acosta, Hans-Jörg Leis, and Günther Raspotnig "Benzoquinone-rich exudates from the harvestman Pachylus paessleri (Opiliones: Gonyleptidae: Pachylinae)," The Journal of Arachnology 38(3), 584-587, (1 December 2010). https://doi.org/10.1636/B09-110SC.1
Received: 18 December 2009; Published: 1 December 2010
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