QUINONES AND NON-QUINONES FROM THE DEFENSIVE SECRETION OF UNCIGER TRANSSILVANICUS (VERHOEFF, 1899) (DIPLOPODA, JULIDA, JULIDAE), FROM SERBIA

A complex mixture of compounds was identified from the secretion of specimens of Unciger transsilvanicus. Phenol and p-cresol were detected for the first time in the family Julidae, and for the second time in the order Julida. Thirteen quinones were identified, with a great relative abundance of toloquinone and 2-methoxy-3-methyl-1,4-benzoqui- none. Hydroquinone was detected for the first time in the order Julida. Besides these compounds, isopentyl hexacosatetra- enoate and isopentyl esters of saturated and unsaturated fatty acids with chain lengths from C14 to C20were identified. The most abundant non-quinone compound was isopentyl eicosenoate. The relative abundance of quinone and non-quinone in the defensive fluid of U. transsilvanicus was 77% and 23%, respectively. The phylogenetic importance of the registered compounds is briefly discussed.