Observations on Pseudoregma alexanderi (Homoptera, Pemphigidae), an Aphid Species Producing Pseudoscorpion-like Soldiers on Bamboos

概要

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The following observations were made on a soldier-producing bamboo aphid, Pseudoregma alexanderi : 1) When tapped with the point of a pin, soldiers opened and closed their fore legs more frequently than normal 1st instar larvae. 2) Soldiers clasped, with their enlarged fore legs, insect predators artificially placed on the colony, and pierced the predators with their forntal horns. 3) Fourteen soldiers and 2 normal 1st instar larvae were found attacking an aphid competitor, Astegopteryx bambucifoliae, or wearing dead bodies of the latter on their heads. 4) Some soldiers as well as non-soldiers showed leg-shaking behaviour when disturbed 5) Butting among colony members occurred frequently. 6) Soldiers sometimes attacked conspecifics. 7) Synonycha grandis, Pseudoscymnus amplus, and other unidentified predators were found feeding on P. alexanderi. 8) Alate sexuparae were found in May, but not in November and December. 9) Many normal 1st instar larvae were dispersed on the wind. Some problems regarding the life cycle and the soldiers are discussed.
日本昆虫学会の論文
1981-06-25