Latest Cover

Online Office

Contact Us

Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
Sponsored by:Chinese Society of Entomological;institute of zoology, chinese academy of sciences;
Address:Chaoyang District No. 1 Beichen West Road, No. 5 hospital,Beijing City,100101, China
Tel:+86-10-64807137
Fax:+86-10-64807137
Email:entom@ioz.ac.cn
Your Position :Home->Past Journals Catalog->2021年58 No.1

Larval morphology, instars and life cycle of Cricula variabilis (Lepidoptera: Saturniidae)
Author of the article:ZHANG Jin-Kun;HU Ke-Yan;ZHANG Guo-Xiang;FENG Ying;WEN Xiu-Jun;WANG Cai;MA Tao
Author's Workplace:1. Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China; 2. Forest Resources Conservation Center of Guangdong Province, Guangzhou 510173, China
Key Words:Cricula variabilis; larvae instars; developmental duration; life cycle; morphological characteristics
Abstract:


[Objectives]  To describe the development of Cricula variabilis and elucidate the life cycle, morphological characteristics and larval instars of this species. [Methods]  Head capsule width, body length and body width, of larvae were measured to calculate Brooks and Crosby ratios. A linear regression model was then fitted to the data to determine the best criteria for instar separation. [Results]  A generation of C. variabilis persists for a total of (77.86 ± 1.09) d, 29.44% of which is comprised of the pupal stage, 14.46% by the egg stage, 6.19% by the adult stage and 49.91% by the larval stage. The larval stage has six instars, which can be distinguished on the basis of head capsule width according to Dyar’s and Crosby rules. The duration of each successive instar is longer than that of the preceding instar. Exponential, quadratic and cubic linear models of head capsule width provided the best estimates the larval age. The relationship between head capsule width and larval instar was best explained by the equations: y = 0.103 8x2 - 0.026 2x + 0.735 8 (R2 = 0.996 5), y = 0.572 6e0.340 4x (R2 = 0.995 6), y = 0.001 5x3 + 0.087 9x2 + 0.021 8x + 0.697 6 (R2 = 0.996 5). [Conclusion]  A single generation of C. variabilis persists for (77.86 ± 1.09) d, 49.91% of which is comprised of the larval stage. The latter has a total of 6 instars which are best distinguished on the basis of head capsule width.



CopyRight©2024 Chinese Journal of Aplied Entomology