眼优角蚱生活史及其生物学特性

Life history and biological characteristics of Eucriotettix oculatus

通过对越冬的眼优角蚱Eucriotettix oculatus(Bolivar,1898)成虫进行饲养,研究了眼优角蚱的生活史和生物学特性。结果表明:眼优角蚱主要取食幼嫩苔藓及腐殖质;雄性若虫为5龄,雌性若虫为6龄,末龄若虫龄期最长;雌性羽化时间比雄性推迟6 d左右;通常羽化后9 d开始交尾,交尾持续1~1.5 h;交尾24 h后开始产卵,1次产卵持续1.5 h左右;每头成虫可交尾2~3次,每次产1块卵,每块卵30~60粒,卵块形状大小不同;非越冬卵发育期平均为13 d;雄性和雌性若虫期分别为31~53 d和39~62 d。

With rearing experiment of overwintering adult Eucriotettix oculatus,the life history and biological characteristics of E.oculatus were researched.The results were as follows:it might be suggested that the species appeared to feed mainly on tender moss and humus;the male and female nymphs consisted of 5 and 6 nymphal instars,respectively,and yet the duration of the last instar was the longest among all instars;the emergence of female adult was about 6 days later than that of male;usually mating behaviour instituted on the 9 th day after emerging and lasted from 1 up to 1.5 hours;an ovipositing gesture initiated on the first day after fulfilling the inter-copulating duty,continuing for around 1.5 hours;each female and male mature individual probably could be able to copulate two and three times coupled with the number of eggs of one egg mass laid every time being 30 up to 60 and the shape and size of that various;generally the non-hibernating-egg stage was averagely 13 days;the ranges of male and female nymphal stadiums were 31 to 53 and 39 to 62 days,respectively.