Simulium damnosum Theobald complex is a group of black flies which vector filarial worms that cause onchocerciasis in Africa. Studies were conducted to investigate the morphological composition of adult S. damnosum complex in three ecological zones of Osun State, Nigeria. Adult black flies were sampled between October 2014 and September 2016, and the wing tufts, antennae, fore coxae and other morphotaxonomic characters were observed and classified following standard methods. The results revealed a sympatric occurrence of both forest- and savannah-dwelling groups (morphotypes) of black flies at each zone with the Guinea savannah zone (Iwo) having significantly higher abundance of forest than savannah black flies. The derived savannah (Ede) had higher abundance of savannah than forest black flies while the rainforest (Obokun) had more forest than savannah black flies but there was no significant difference between them. In Iwo, the highest abundance of forest flies was obtained in October and June while savannah flies were highest in November. The monthly abundance of each morphotype of black flies was significantly different in Ede but not in Obokun. Wing tuft colours among forest flies varied significantly in Iwo and Ede. This study indicates that there is substantial morphological diversity among sibling species of black flies which is useful for identification and could be exploited in black fly control. The presence of savannah flies in the three zones calls for surveillance for potential incursion of blinding parasite strain which migrant savannah flies could introduce to the communities.

中文翻译：

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尼日利亚 Osun 州 Simulium dadosum complex（双翅目：Simuliidae）的森林和稀树草原形态类型的同域发生

Simulium dadosum Theobald complex 是一群黑蝇，它们携带在非洲引起盘尾丝虫病的丝虫。进行研究以调查尼日利亚奥孙州三个生态区中成虫 S.damnosum 复合体的形态组成。2014 年 10 月至 2016 年 9 月间对成年黑蝇进行采样，并按照标准方法观察和分类翼簇、触角、前轴和其他形态分类学特征。结果显示，在每个区域都出现了森林和热带草原栖息的黑蝇群（形态类型），几内亚热带草原区 (Iwo) 的森林丰度显着高于热带草原黑蝇。派生的大草原 (Ede) 的大草原丰度高于森林黑蝇，而雨林 (Obokun) 的森林比大草原黑蝇多，但它们之间没有显着差异。在硫磺岛，10 月和 6 月获得的森林苍蝇丰度最高，而热带草原苍蝇在 11 月的丰度最高。每种形态型黑蝇的月丰度在 Ede 中显着不同，而在 Obokun 中则没有。在硫磺岛和伊德，林蝇的翼簇颜色差异很大。该研究表明，黑蝇的同胞物种之间存在大量形态多样性，这有助于识别并可用于黑蝇控制。