無霸勾蜓的人工飼育與幼期發育

Larval developments of the Jumbo Dragonfly (Anotogaster klossi Fraser) under laboratory conditions (Odonata: Cordulegastridae)

無霸勾蜓（Anotogaster klossi Fraser）是台灣體型最大，也是唯一的保育類蜻蛉目昆蟲。為瞭解無霸勾蜓幼期發育並建立飼育技術，本研究自苗栗縣頭屋鄉採集蟲卵，在20°C定溫下，卵孵化率達86.7%（n＝30），卵期平均28.1±1.4日（n＝26）。人工飼育條件下，幼蟲發育所需齡期數包括15或16齡，其中雄性幼蟲期369.1±22.9日（n＝7），雌性幼蟲期388.3±18.9日（n＝10），雌性幼蟲發育期顯著大於雄性。終齡幼蟲及羽化成蟲的頭寬比較，雌性亦顯著大於雄性。幼蟲發育期需15或16齡的終齡幼蟲比較上，無論是雄性與雌性，二者之頭寬與發育期皆未達到顯著差異。

The jumbo dragonfly, Anotogaster klossi Fraser, is the largest and the only protected Odonata species in Taiwan. In order to understand the larval developments of this species and establish a laboratory rearing protocol, we collected new-laid eggs of A. klossi from Touwu Township, Miaoli County. These eggs were incubated at 20°C. The hatching rate was 86.7% (n=30) and the duration of embryonic stage was 28.1±1.4 days (mean ± standard deviation, n=26). Under artificial breeding conditions, the instar numbers for larvae to develop varied from 15 to 16. The average larval stage of males was 369.1±22.9 days (n=7), and females was 388.3±18.9 days (n=10). The larval duration of females was significantly longer than that of males. Furthermore, the head width of females was significantly larger than that of males for both final instar larvae and emerging adults. However, no significant differences in head widths and larval durations were found between the final instar larvae with 15 and 16 instars for both males and females.