Abstract：
Chemical substances are of utmost importance for the biotic interactions between animals and their predators/parasites; many of these semiochemicals are emitted for defence purposes. One of the most deterrent and toxic biogenic substances we know of is hydrogen cyanide, which can be stored by certain insects, millipedes, centipedes and arachnids in the form of stable and less volatile molecules. The aim of this study was to analyse the biology and chemistry of such a defence mechanism in a geophilomorph centipede (Chilopoda). The cyanogenic secretion of Clinopodes flavidus is discharged from the ventral glands, whose glandular units are located in the space between the cuticle and the trunk muscles and do not extend deep into the segment. In addition to hydrogen cyanide, the ventral secretion contains 2-methylpentanoic acid, benzaldehyde, benzoyl cyanide, 2-methyl branched C-9 carboxylic acid (tentatively identified as 2-methyloctanoic acid), methyl 2-phenylacetate, benzoic acid and mandelonitrile as well as four major proteins with a molecular weight of 150, 66.2, 59 and 55 kDa. The correlation between the presence of ventral glands and guarding with the female\'s ventral side facing away from the eggs and young indicates a functional link between these two traits. We hope that the specificity of the chemical composition of the ventral secretion could serve as a criterion for chemotaxonomy and that the analysis of more species will help to clarify the phylogenetic relationships within the Geophilomorpha.
摘要：
化学物质对于动物与其捕食者/寄生虫之间的生物相互作用至关重要；许多这些化学信息素出于防御目的而排放。我们所知道的最具威慑力和毒性的生物物质之一是氰化氢，可以被某些昆虫储存，千足虫,以稳定且挥发性较低的分子形式存在的cent和蜘蛛。这项研究的目的是分析这种防御机制的生物学和化学。FlavidusClinopodes的生氰分泌物从腹侧腺体排出，其腺体单位位于角质层和躯干肌肉之间的空间中，并且不延伸到该部分。除了氰化氢,腹侧分泌物含有2-甲基戊酸，苯甲醛,苯甲酰氰,2-甲基支链C-9羧酸（暂时鉴定为2-甲基辛酸），2-苯基乙酸甲酯,苯甲酸和扁桃腈以及分子量为150、66.2、59和55kDa的四种主要蛋白质。腹腺的存在与雌性腹侧远离卵和幼体的保护之间的相关性表明这两个性状之间存在功能联系。我们希望腹侧分泌物化学成分的特异性可以作为化学分类学的标准，并且对更多物种的分析将有助于阐明地鼠内的系统发育关系。
