Antennal and maxillary palp morphology, and sensillar equipment, of the spruce bark beetle predators, Medetera signaticornis and Medetera infumata (Diptera: Dolichopodidae)

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2023-01-01 DOI:10.1016/j.asd.2022.101229
Maria Sousa , Rickard Ignell , Marc Pollet , Kristina K. Green , Paul G. Becher , Göran Birgersson
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Abstract

Many long-legged Medetera flies are natural enemies of bark beetle pests, which they detect using olfactory cues, likely through olfactory sensilla on the antennae and maxillary palps. Morphological characterisation of olfactory sensilla among insects can provide a basis for future taxonomic, phylogenetic or electrophysiological studies. Scanning electron microscopy was used to describe the morphology of olfactory organs and sensillar equipment of Medetera signaticornis and M. infumata. Three different olfactory sensillum types were found in both fly species, sensilla trichodea, s. basiconica and grooved pegs. Based on size and wall structure, s. trichodea and s. basiconica were categorised into different subtypes. Sharp-tipped curved s. trichodea, and small, large and thin s. basiconica were found on the antennal postpedicel of M. signaticornis adults, while grooved s. basiconica were found in M. infumata. The density of sharp-tipped long s. trichodea was significantly higher in males compared to females, and in M. signaticornis compared to M. infumata. Long-grooved s. basiconica were found grouped in a small pit on the maxillary palps of both species. Comparison of our results with the limited available ecological data suggests that differences in numbers of specific sensillum types may reflect adaptations related to olfactory-driven behaviours such as host seeking.

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云杉树皮甲虫捕食者——刺足螨和刺足螨的触须和上颌触须形态及感受器(双翅目:刺足螨科)
许多长腿蝇是树皮甲虫害虫的天敌,它们通过嗅觉线索探测树皮甲虫,可能是通过触角和上颌触须上的嗅觉感受器。昆虫嗅感器的形态特征可以为未来的分类、系统发育或电生理研究提供依据。采用扫描电子显微镜观察了马蹄莲和风肿马蹄莲的嗅觉器官和感觉器官的形态。在两种蝇类中均发现了三种不同的嗅感器类型,分别是毛感器、基鼻感器和槽鼻感器。根据大小和壁结构,将毛霉和基色霉划分为不同的亚型。成虫的触角后花梗上有尖尖弯曲的毛棘,小、大、细的基裂棘,而成虫的触角后花梗上有沟槽状基裂棘。尖尖长毛蛾的密度在雄虫中显著高于雌虫,在大角田鼠中显著高于长角田鼠。在两种植物的上颌触须上,发现长沟的基色霉群聚在一个小坑内。将我们的结果与有限的可用生态数据进行比较表明,特定感觉器类型数量的差异可能反映了与嗅觉驱动行为(如寻找宿主)相关的适应。
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来源期刊
CiteScore
3.50
自引率
10.00%
发文量
54
审稿时长
60 days
期刊介绍: Arthropod Structure & Development is a Journal of Arthropod Structural Biology, Development, and Functional Morphology; it considers manuscripts that deal with micro- and neuroanatomy, development, biomechanics, organogenesis in particular under comparative and evolutionary aspects but not merely taxonomic papers. The aim of the journal is to publish papers in the areas of functional and comparative anatomy and development, with an emphasis on the role of cellular organization in organ function. The journal will also publish papers on organogenisis, embryonic and postembryonic development, and organ or tissue regeneration and repair. Manuscripts dealing with comparative and evolutionary aspects of microanatomy and development are encouraged.
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