Fig. 1

Phenotypic characters, histological observation, and hepatopancreas and gonad indexes among different ovary developmental stages of precocious E.sinensis. a. Shape of abdominal sternite of female E.sinensis. B5-B5’ indicates the outside length of the fifth abdominal sternite, and C5-C5’ indicates the inside length of the fifth abdominal sternite. b. Different shapes of abdominal sternite corresponding to different ovary developmental stages in female E. sinensis. The tissue-slices figure was photographed under 100× in LEIKA microscope. c. Average hepatopancreas and gonad indexes among different groups of precocious E.sinensis. HSI: hepatopancreas index, GI: gonad index