Tetraneura fusiformis Matsumura, 1917

Watanabe, Tomoko, Lee, Wonhoon, Sano, Masakazu, Murakami, Keisuke & Akimoto, Shin-Ichi, 2022, Taxonomic revision of the Tetraneura akinire species group (Insecta, Aphididae, Eriosomatinae), with description of a new species and a correction of a nomenclatural confusion, Zootaxa 5183 (1), pp. 162-186 : 165

Tetraneura fusiformis Matsumura, 1917

This species was described based on gall generations of U. davidiana var. japonica collected from Sapporo, Hokkaido, Japan. The gall was reported to be rosy-red and spindle-shaped. Rosy-red galls are common in U. davidiana var. japonica in central and northern Hokkaido, Japan ( Figure 1I ). Type specimens are considered to be lost. Hille Ris Lambers (1970) treated this specific name as a junior synonym of T.nigriabdominalis sensu Hille Ris Lambers (1970) . However, Blackman & Eastop (2021) and Favret (2021) treated T. fusiformis as a valid name. Therefore, currently, the taxonomic and phylogenetic relationships between T. akinire in Honshu and T. fusiformis in Hokkaido have not been evaluated. Lee et al. (2012) showed that T. nigriabdominalis (= T. akinire ) and T. fusiformis are genetically divided into two groups (types A and B) based on the mitochondrial COI sequence, with ca. 2% divergence between the two types. Type A ( T. akinire ) is widely distributed in Japan, whereas type B ( T. fusiformis ) is distributed only in Hokkaido, with the two types coexisting at Sapporo. Thus, it is necessary to determine whether the two types can be regarded as the same species, and how T. fusiformis should be taxonomically dealt with. The present study examines this problem based on morphological and molecular evidence. To examine the phylogenetic relationships between T. akinire and T. fusiformis , we compared the mitochondrial COI sequences of samples collected widely from Europe, North America, Japan (Honshu, Okinawa, and Hokkaido), South Korea, and Malaysia.

Figures

FIGURE 1. Galls induced by aphids of the Tetraneura akinire species group. T. ovaliformis sp. nov. (greenish globular gall; A, B, and C), unidentified Korean species (greenish globular gall; D and E), T. akinire sensu novo (spindle-shaped galls; F, G, H, and I), and T. sorini (reddish small globular gall; J, K, and L). collection data: A, 10.VI.2015, Sapporo, Japan, Ulmus davidiana; B, 11.VI.2015, Sapporo, Japan, U. davidiana; C, 18.VI.2011, Sapporo, Japan, U. davidiana; D and E, 26.V.2012, Jeongseon, Gangwon-do, South Korea, U. davidiana; F, 28.IV.2012, Kashiwa, Japan, U. parvifolia; G and H, 10.VI.2015, Sapporo, Japan, U. davidiana; I and J, 30.V.2015, Iwamizawa, Japan, U. davidiana; K, 31.V.2020, Iwamizawa, Japan, U. davidiana; L, 7.VI.2020, Iwamizawa, Japan, U. davidiana.