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<p><i>Cydalima perspectalis</i> Walker, 1859, a moth species within the subfamily Spilomelinae, is a serious pest of various Buxaceae plants. To enrich the larval morphological dataset of <i>C. perspectalis</i>, we examined the external morphology and chaetotaxy of the first-instar larva using light and scanning electron microscopy. The results reveal that the first-instar larva possesses the following characteristics: (a) the labral notch shallow and is approximately one-fourth of the total dorso-ventral width of the labrum<b>;</b> (b) thoracic and abdominal chaetotaxy differing from that of later instars; (c) antennal sensilla consisting of six sensilla basiconica, one sensillum styloconicum, and two sensilla chaetica; (d) the maxillary palp bears eight sensilla basiconica, while the galea bears three sensilla trichodea, two sensilla styloconica, and three sensilla basiconica; (e) ventral proleg crochets arranged in a triordinal penellipse, while anal proleg crochets form a biordinal circle. These diagnostic features enrich the morphological characterization of early instar larvae within the subfamily Spilomelinae.</p>

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Ultramorphology of the first-instar larva of Cydalima perspectalis (Lepidoptera: Crambidae)

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Jinyu Zhan,
  • Yawen Zhang,
  • Yingqi Wang,
  • Zhaofu Yang

摘要

Cydalima perspectalis Walker, 1859, a moth species within the subfamily Spilomelinae, is a serious pest of various Buxaceae plants. To enrich the larval morphological dataset of C. perspectalis, we examined the external morphology and chaetotaxy of the first-instar larva using light and scanning electron microscopy. The results reveal that the first-instar larva possesses the following characteristics: (a) the labral notch shallow and is approximately one-fourth of the total dorso-ventral width of the labrum; (b) thoracic and abdominal chaetotaxy differing from that of later instars; (c) antennal sensilla consisting of six sensilla basiconica, one sensillum styloconicum, and two sensilla chaetica; (d) the maxillary palp bears eight sensilla basiconica, while the galea bears three sensilla trichodea, two sensilla styloconica, and three sensilla basiconica; (e) ventral proleg crochets arranged in a triordinal penellipse, while anal proleg crochets form a biordinal circle. These diagnostic features enrich the morphological characterization of early instar larvae within the subfamily Spilomelinae.