Revision of the aphid subgenus Ramitrichophorus Hille Ris Lambers of genus Macrosiphoniella (Hemiptera, Homoptera: Aphididae, Macrosiphini), with redescriptions of all known species and identification keys Author Stekolshchikov, Andrey V. Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, St. Petersburg 199034, Russia. Author Buga, Sergey V. 0000-0002-1140-9042 Zoological Department, Belarusian State University, pr. Nezavisimosti 4, Minsk 220030, Republic of Belarus. sergey. buga @ gmail. com; https: // orcid. org / 0000 - 0002 - 1140 - 9042 sergey.buga@gmail.com text Zootaxa 2022 2022-09-12 5183 1 293 342 http://zoobank.org/d6fee369-60f2-483f-8867-01396cda2932 journal article 10.11646/zootaxa.5183.1.23 aef90821-b086-4773-b589-099432880afe 1175-5326 7075519 AD0BED04-C49A-4068-8D3A-22DE8B172744 Keys to species of the subgenus Ramitrichophorus Apterous and alate viviparous females 1. Dorsal body setae and setae on head very short, strongly blunt, rod-like or very weakly capitate ( Fig. 1 ). Longest seta on III abdominal tergite of apterous viviparous females 6–12 (0.21–0.50 times as long as articular diameter of 3rd antennal segment), of alate viviparous females 5–10 (0.36 times as long as articular diameter of 3rd antennal segment). Longest seta on 3rd antennal segment of apterous viviparous females 6–13 (0.17–0.50 times as long as articular diameter of 3rd antennal segment), of alate viviparous females 5–9 (0.32 times as long as articular diameter of 3rd antennal segment). The total number of the marginal and spinal setae on the III abdominal segment of apterous viviparous females 8–19, of alate viviparous females 13. Length of ultimate rostral segment of apterous viviparous females 181–243 (1.45–1.82 times as long as 2nd segment of hind tarsus), of alate viviparous females 200–220 (1.50–1.60 times as long as 2nd segment of hind tarsus)................................................................................... .. M. ( R. ) hillerislambersi Ossiannilsson, 1954 - Dorsal body setae and setae on head relatively long, finely pointed, with bifurcate or flabellate apices, rarely blunt or weakly capitate apices, but never rod-shaped ( Figs. 2–3 ). Longest seta on III abdominal tergite of apterous viviparous females 30–111 (1.04–4.63 times as long as articular diameter of 3rd antennal segment), of alate viviparous females 46–78 (1.64–3.13 times as long as articular diameter of 3rd antennal segment). Longest seta on 3rd antennal segment of apterous viviparous females 15–48 (0.46–2.12 times as long as articular diameter of 3rd antennal segment), of alate viviparous females 23–33 (0.90–1.44 times as long as articular diameter of 3rd antennal segment). The total number of the marginal and spinal setae on the III abdominal segment of apterous viviparous females 11–33, of alate viviparous females 16–24. Length of ultimate rostral segment of apterous viviparous females 190–287 (1.45–2.00 times as long as 2nd segment of hind tarsus), of alate viviparous females 228–245 (1.61–1.79 times as long as 2nd segment of hind tarsus)............................................... 2 2 . Setae on head, dorsal side of thorax and abdomen evenly thick, slightly tapering towards the apex, with bifurcate or flabellate apices ( Fig. 2 ). Longest seta on III abdominal tergite of apterous viviparous females 30–81 (1.04–3.44 times as long as articular diameter of 3rd antennal segment), of alate viviparous females 46–68 (1.64–1.73 times as long as articular diameter of 3rd antennal segment). Longest seta on 3rd antennal segment of apterous viviparous females 15–35 (0.46–1.56 times as long as articular diameter of 3rd antennal segment), of alate viviparous females 25 (0.91 times as long as articular diameter of 3rd antennal segment). Length of ultimate rostral segment of apterous viviparous females 190–263, 1.45–1.86 times as long as 2nd segment of hind tarsus.......................................................... M. ( R. ) janckei Börner, 1939 - Setae on head, dorsal side of thorax and abdomen distinctly tapering towards the apex, finely pointed or with bifurcate or flabellate apices, in this case, each of the teeth of the fork is finely pointed ( Fig. 3 ). Longest seta on III abdominal tergite of apterous viviparous females 53–111 (2.00–4.63 times as long as articular diameter of 3rd antennal segment), of alate viviparous females 53–78 (2.10–3.38 times as long as articular diameter of 3rd antennal segment). Longest seta on 3rd antennal segment of apterous viviparous females 26–48 (1.13–2.12 times as long as articular diameter of 3rd antennal segment), of alate viviparous females 23–33 (0.90–1.44 times as long as articular diameter of 3rd antennal segment). Length of ultimate rostral segment of apterous viviparous females 214–287, 1.62–2.00 times as long as 2nd segment of hind tarsus................................................................................................. .. M. ( R. ) medvedevi ( Bozhko, 1950 ) Males (The key includes only two species, since we don’t have morphological data for M. ( R. ) janckei ) 1. Dorsal body setae and setae on head very short, strongly blunt, rod-like or very weakly capitate (Fig. 1). Longest seta on 3rd antennal segment and III abdominal tergite 8–10 (0.33–0.57 times as long as articular diameter of 3rd antennal segment). The total number of the marginal and spinal setae on the III abdominal segment 6–12. Length of ultimate rostral segment 166–195......................................................... M. ( R. ) hillerislambersi Ossiannilsson, 1954 - Dorsal body setae and setae on head distinctly tapering towards the apex, finely pointed or with bifurcate or flabellate apices, in this case, each of the teeth of the fork is finely pointed ( Fig. 3 ) Longest seta on 3rd antennal segment 30 (1.33–1.41 times as long as articular diameter of 3rd antennal segment), on III abdominal tergite 66–68 (2.89–3.18 times as long as articular diameter of 3rd antennal segment). The total number of the marginal and spinal setae on the III abdominal segment 22. Length of ultimate rostral segment 207.............................................. ... M. ( R. ) medvedevi ( Bozhko, 1950 ) Oviparous females 1. Dorsal body setae and setae on head very short, strongly blunt, rod-like or very weakly capitate ( Fig. 1 ). Longest seta on III abdominal tergite 6–12 (0.27–0.53 times as long as articular diameter of 3rd antennal segment), on 3rd antennal segment 8–12 (0.25–0.47 times as long as articular diameter of 3rd antennal segment). The total number of the marginal and spinal setae on the III abdominal segment 9–17. Length of ultimate rostral segment 187–225 (1.50–1.80 times as long as 2nd segment of hind tarsus).......................................................... .. M. ( R. ) hillerislambersi Ossiannilsson, 1954 - Dorsal body setae and setae on head relatively long, finely pointed, with bifurcate or flabellate apices, rarely blunt or weakly capitate apices, but never rod-shaped ( Figs. 2–3 ). Longest seta on III abdominal tergite 68–99 (2.84–4.50 times as long as articular diameter of 3rd antennal segment), on 3rd antennal segment 30–48 (1.37–2.00 times as long as articular diameter of 3rd antennal segment). The total number of the marginal and spinal setae on the III abdominal segment 21–32. Length of ultimate segment of rostrum 220–252 (1.61–1.84 times as long as 2nd segment of hind tarsus)........................ 2 2 . Setae on head, dorsal side of thorax and abdomen evenly thick, slightly tapering towards the apex, with bifurcate or flabellate apices ( Fig. 2 ) and only sometimes blunt or weakly capitate. Longest seta on III abdominal tergite 68–76 (2.84–3.16 times as long as articular diameter of 3rd antennal segment), on 3rd antennal segment 33–35 (1.37–1.47 times as long as articular diameter of 3rd antennal segment)................................................ .. M. ( R. ) janckei Börner, 1939 - Setae on head, dorsal side of thorax and abdomen distinctly tapering towards the apex, finely pointed or with bifurcate or flabellate apices, in this case, each of the teeth of the fork is finely pointed ( Fig. 3 ). Longest seta on III abdominal tergite 81–99 (3.08–4.50 times as long as articular diameter of 3rd antennal segment), on 3rd antennal segment 30–48 (1.38–2.00 times as long as articular diameter of 3rd antennal segment)................................ M. ( R. ) medvedevi ( Bozhko, 1950 )