Tyloids in Pimpla turionellae (L.) are release structures of male antennal glands involved in courtship behaviour (Hymenoptera: Ichneumonidae)

Ferdinando Bin , Felix Wäckers , Roberto Romani , Nunzio Isidoro
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引用次数: 52

Abstract

Morphological and behavioural studies were performed on male antennal tyloids of Pimpla turionellae (L.) (Hymenoptera: Ichneumonidae). S.E.M. and T.E.M. investigations revealed that tyloids, located on 8th and 9th male antennomeres, are release structures of integumentary glands rather than sensory organs. These are bicellular secretory units consisting of one secretory cell, with a well-developed receiving canal, and a canal cell. The latter forms the evacuating canal, which connects the receiving canal to the external pore on the tyloids. Observations of mating behaviour showed that during the precopulatory phase, males typically perform antennal strokes during which the secretion containing tyloids comes in direct contact with the female antennae. Stroking intensity seemed to be correlated with female receptiveness, being more prolonged when females are initially unreceptive. When encountering receptive females, male stroking is usually limited or even omitted entirely. Results from behavioural comparisons between unmanipulated pairs and pairs in which male tyloids had been coated with glue, clearly indicate that the secretion mediates mate acceptance in females.

turionellae扁蜂(pimpa turionellae, L.)的翅突是雄性触角腺的释放结构,参与求偶行为(膜翅目:姬蜂科)
对膜翅目:姬蜂科(Pimpla turionellae, L.)的雄性触须进行了形态学和行为学研究。sem和tem研究发现,位于雄性触角第8和第9触角上的叶突是被腺体的释放结构,而不是感觉器官。它们是双细胞分泌单位,由一个具有发育良好的接收管的分泌细胞和一个管细胞组成。后者形成排出管,将接收管与茎突上的外孔连接起来。对交配行为的观察表明,在交配前阶段,雄性通常会进行触须抚摸,在此过程中,含有叶状体的分泌物直接接触到雌性的触须。抚摸的强度似乎与女性的接受度有关,当女性最初不接受时,抚摸的时间会更长。当遇到接受的雌性时,雄性的抚摸通常是有限的,甚至完全省略。对未处理的雄蝶蝶和涂有胶水的雄蝶蝶的行为比较结果清楚地表明,这种分泌物介导了雌性对配偶的接受。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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