On the horns of a dilemma: toward a better understanding of the <i>Monacon</i> species (Hymenoptera: Perilampidae) of Borneo

A new species of <i>Monacon</i> is described from Borneo based on digital images, COI sequences and X-ray microtomography. The natural history of this primary parasitoid is documented and its host, a pinhole borer or ambrosia beetle, is documented with digital images and a COI sequence. The X-ray microtomography revealed that the frontal horn that is characteristic of the genus <i>Monacon</i> is not simply a cuticular process, but is associated with tissues, and may have a sensory function.本研究基于数码影像、细胞色素C氧化酶亚基I（COI）序列与X射线显微断层扫描（X-ray microtomography）数据，对婆罗洲产出的莫纳肯蜂属（Monacon）一新物种展开描述。该初级寄生性天敌的自然史已被完整记录，其宿主为穴居蛀木小蠹（pinhole borer）或称菌食小蠹（ambrosia beetle），宿主相关信息亦通过数码影像及COI序列完成存档。X射线显微断层扫描结果表明，莫纳肯蜂属标志性的额角并非单纯的表皮突起，而是与活体组织相连，推测其可能具备感知功能。