Department of Biology, Utah State University, Logan, Utah, USA..
2Division of Plant Industry, Florida Department of Agriculture and Consumer Services, Gainesville, Florida USA.
Zootaxa. 2022 Sep 12;5183(1):203-219. doi: 10.11646/zootaxa.5183.1.16.
Hamamelistes and Hormaphis aphids of the tribe Hormaphidini are distributed disjunctly in eastern North America and Eurasia. Host-alternating species have life cycles encompassing generations in a gall on witch-hazel (Hamamelis spp.) and generations on leaves of birch (Betula spp.). In Hamamelistes, generations on witch-hazel induce globular pouch galls on flower or leaf buds. Herbarium specimens of a related Hamamelidaceae genus, Fothergilla, contain large galls in place of the seed head. We obtained a fresh sample of these elongate pouch galls collected from F. milleri in Alabama, USA. The galls were formed in place of fruiting structures and contained numerous aphids. Examination of morphology and the cytochrome oxidase subunit I barcode DNA sequence confirmed that the aphids are an undescribed species of Hamamelistes. Here, we describe the new species, Hamamelistes blackmani Dederich von Dohlen sp. n., from the morphology of foundresses, immatures, and winged forms in the gall. The life cycle is presumed monoecious. In addition, we review the evidence for including other genera in Hormaphidini and recommend that this tribe be restricted to Hamamelistes and Hormaphis.
金缕梅族和 Hormaphis 蚜在北美东部和欧亚大陆呈不连续分布。宿主交替的物种的生命周期包括在榛树（Hamamelis spp.）上的瘿中的一代和在桦树（Betula spp.）上的一代。在 Hamamelistes 中，在榛树上的一代诱导花或叶芽上的球状囊状瘿。与金缕梅科相关的 Fothergilla 属的植物标本中，含有大的瘿，取代了种子头。我们从美国阿拉巴马州的 F. milleri 获得了这些细长囊状瘿的新鲜样本。这些瘿形成于生殖结构的位置，并包含大量的蚜虫。形态学和细胞色素氧化酶亚基 I 条形码 DNA 序列的检查证实，蚜虫是 Hamamelistes 的一个未描述的物种。在这里，我们从瘿中发现的雌成虫、幼虫和有翅型的形态描述了新种 Hamamelistes blackmani Dederich von Dohlen sp. n.。生命周期被认为是雌雄同体的。此外，我们回顾了将其他属纳入 Hormaphidini 的证据，并建议将该族限制在 Hamamelistes 和 Hormaphis 中。
