While considerable knowledge on the chemistry of the scent gland secretions from the opilionid suborders Laniatores and Cyphophthalmi has been compiled, it is the Palpatores (Eupnoi and Dyspnoi) where chemical data are scarce. In particular, the Dyspnoi have remained nearly unstudied, mainly due to their reported general reluctance to release secretions as well as to the phenomenon of production of insoluble—and inaccessible—solid secretion. We here show that at least certain nemastomatid Dyspnoi, namely all three species of genus Carinostoma, indeed produce a volatile secretion, comprising octan-3-one, 6-methyl-5-hepten-2-one and acetophenone in species-specific combinations. In all Carinostoma spp., these volatiles are embedded in a semi-volatile, naphthoquinone matrix (mainly 1,4-naphthoquinone and 6-methyl-1,4-naphthoquinone). In detail, acetophenone and traces of naphthoquinones characterize the secretions of Carinostoma carinatum. A mixture of octan-3-one, 6-methyl-5-hepten-2-one and large amounts of naphthoquinones were found in C. elegans, and 6-methyl-5-hepten-2-one together with small amounts of naphthoquinones in the secretions of C. ornatum. So far, exclusively naphthoquinones had been reported from a single dyspnoan hitherto studied, Paranemastoma quadripunctatum.

中文翻译：

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关于呼吸困难的收割者（蛛形纲、Opiliones）神秘的气味腺：产生挥发性分泌物的第一个证据。


虽然人们已经对阿片类亚目 Laniatores 和 Cyphophasemi 的气味腺分泌物的化学知识进行了相当多的了解，但 Palpatores（Eupnoi 和 Dyspnoi）的化学数据却很少。特别是，呼吸困难者几乎没有被研究过，这主要是因为据报道它们普遍不愿意释放分泌物以及产生不溶性且难以接近的固体分泌物的现象。我们在这里表明，至少某些线虫 Dyspnoi，即Carinostoma属的所有三个物种，确实产生挥发性分泌物，其中包含辛烷-3-酮、6-甲基-5-庚烯-2-酮和苯乙酮的物种特异性组合。在所有Carinostoma spp. 中，这些挥发物都嵌入半挥发性萘醌基质中（主要是 1,4-萘醌和 6-甲基-1,4-萘醌）。具体而言，苯乙酮和痕量萘醌是Carinostoma carinatum分泌物的特征。在线虫中发现了辛烷-3-酮、6-甲基-5-庚烯-2-酮和大量萘醌的混合物，以及6-甲基-5-庚烯-2-酮和少量萘醌的混合物在C. ornatum的分泌物中。到目前为止，仅从迄今为止研究的单一呼吸困难动物Paranemastoma fourpuntatum中报道了萘醌。