Acta Entomologica Sinica ›› 2019, Vol. 62 ›› Issue (6): 743-755.doi: 10.16380/j.kcxb.2019.06.010

• RESEARCH PAPERS • Previous Articles     Next Articles

Ultrastructure of the sensilla on adult antenna and larval head of Ectropis grisescens (Lepidoptera: Geometridae)

ZHANG Fang-Mei1, JIN Yin-Li1, ZHANG Li-Li2, YIN Jian1, CHEN Jun-Hua1, ZHAO Qi3, PAN Peng-Liang1,* #br#   

  1. (1. Henan Provincial South Henan Crop Pest Green Prevention and Control Academician Workstation, Agricultural Department, Xinyang Agriculture and Forestry University, Xinyang, Henan 464000, China; 2. College of Life Sciences, Xinyang Normal University, Xinyang, Henan 464000, China; 3. Kaifeng Experimental Station of China Agricultural University, Kaifeng, Henan 475000, China)
  • Online:2019-06-20 Published:2019-06-04

Abstract: 【Aim】 This study aims to observe the types, morphology, quantity and distribution of sensilla on adult antenna and larval head of the tea geometrid Ectropis grisescens, so as to explore the behavioral mechanism of E. grisescens. 【Methods】 The ultrastructure of sensilla on adult antenna and larval head of E. grisescens was observed with scanning electron microscopy. 【Results】 The results showed that there are eight kinds of sensilla on the adult antennae, including sensilla styloconica, sensilla auricillica, sensilla trichodae (type Ⅰ-Ⅳ), Böhm bristles, sensilla coeloconica (type Ⅰ and Ⅱ), sensilla squamiformia, sensilla basiconica (type Ⅰ and Ⅱ), and sensilla chaetica. Sensilla styloconica were found only on female adults, while sensilla auricillica and sensilla trichodae (ST Ⅰ-Ⅲ) only on male adults. One sensillum styloconicum, one sensillum basiconicum and two sensilla chaetica were found on the antenna of the 5th instar larvae, six pairs of sensilla chaetica on the labrum, three pairs of sensilla chaetica and one pair of sensilla digitiformia on the epipharynx, two sensilla chaetica on the outer face of mandible, five sensilla chaetica, nine sensilla basiconica and two sensilla styloconica on the mandible and maxillary palp, one sensillum basiconicum and one sensillum chaeticum on the labial palp, and one pair of sensilla chaetica on the front of spinneret. 【Conclusion】 The antennal sensilla show sexual dimorphism in E. grisescens, with more kinds and quantity of sensilla on male antenna. It is so inferred that males have stronger ability to identify host plants and sex pheromones. The sensilla on larval head are associated with gustation and olfaction, and play a vital role in judging the varieties and suitability of foods.

Key words: Ectropis grisescens, antenna, larval head, morphology, sensilla, scanning electron microscopy