Periphyllus blackmani Li & Huang, 2022

Li, Qiang, Wu, Liying, Cheng, Zhentao, Liu, Zhixiang & Huang, Xiaolei, 2022, Two new cryptic species within Periphyllus koelreuteriae (Hemiptera: Aphididae) feeding on Koelreuteria (Sapindaceae) in China, Zootaxa 5183 (1), pp. 220-238 : 225-228

publication ID	https://doi.org/ 10.11646/zootaxa.5183.1.17
publication LSID	lsid:zoobank.org:pub:3B1F2892-E2F1-410C-96B1-C3F1470DDFBF
DOI	https://doi.org/10.5281/zenodo.7070168
persistent identifier	https://treatment.plazi.org/id/03BCCE67-3A56-FFB4-AB9D-5145FEEE91FD
treatment provided by	Plazi
scientific name	Periphyllus blackmani Li & Huang
status	sp. nov.

Treatment

Periphyllus blackmani Li & Huang sp. nov.

( Figs. 3–4 View FIGURE 3 View FIGURE 4 , 7 View FIGURE 7 & Table S2 View TABLE S )

Apterous viviparous female (n=27). Body dark green, covered with numerous pointed setae in life. Black dorsal spots on abdominal tergites interconnected to the head and cauda ( Fig. 7C View FIGURE 7 ).

Mounted specimens: Body oval ( Fig. 3A View FIGURE 3 ), 2.33–3.59 mm long, 1.67–2.14 times as long as its width. Antennal segments I-II and V-VI, distal 1/2 of antennal segments III-IV, distal ends of middle and hind femur, middle and hind tibiae dark brown; dorsum of head and thorax, eyes, apex of rostrum, the femur of front legs, cauda and siphunculi brown; remaining parts of rostrum and other parts of body pale brown. Dorsum of abdomen with brown and variably-shaped sclerites ( Fig. 3C View FIGURE 3 ). Abdominal tergites I-VII each with 1 pair of marginal sclerites and 1 pair of spinal sclerites; tergite VIII with 1 pair of marginal sclerites and 2 pairs spinal sclerites; pleural sclerites small and irregularly placed on each tergite. Dorsal setae of body long and pointed. Dorsum of head with 11–18 setae, up to 0.27 mm long; abdominal setae 0.07–0.27 mm long, spinal sclerites with 1–3 setae, pleural sclerites with 1 seta, marginal sclerites with 7–15 setae.

Head. Frons flat and straight, eyes with numerous facets ( Fig. 3B View FIGURE 3 ). Antennae 6-segmented ( Fig. 3D View FIGURE 3 ), long, with imbrications on segments III-VI, 0.5–0.73 times as long as body. Processus terminalis 1.85–2.58 times as long as basal part of the last antennal segment; other antennal ratios: VI: III 0.54–0.89, V: III 0.33–0.56, IV: III 0.34–0.57. Segment I with 6–10 setae, segment II with 3–7 setae, segment III with 20–56 setae, segment IV with 8–17 setae, segment V with 8–14 setae, base of segment VI with 3–5 setae, processus terminalis with 2–4 apical setae. The setae of antenna fine and pointed, up to 0.18 mm long. Length of longest seta on segment III 3–3.6 times as long as basal articular diameter of the segment. Rostrum reaching over middle coxae. Apical segment of rostrum with 6–11 setae ( Fig. 3E View FIGURE 3 ), 0.16–0.36 times as long as antennal segment III, 0.75–1.15 times as long as second hind tarsal segment. The full length of processus terminalis of 6th antennal segment arrays annular secondary sensoria.

Thorax. Legs normal and setose. Hind tibiae bearing pointed, long and rigid setae, which are 0.07–0.22 mm long. Distal part of hind tibiae with few rows of stout spinules. Hind tibiae 0.38–0.59 times as long as body. First tarsal chaetotaxy: 5, 5, 5, sometimes 4, 5, 5, or 4, 4, 5. Second hind tarsal segment with 9–13 setae and 0.19–0.39 times as long as antennal segment III ( Fig. 3H View FIGURE 3 ).

Abdomen. Siphunculi 0.08–0.15 mm long, with 2–4 rows of subapical reticulations and slightly flared apex, widest diameter 2.33–4.4 times as long as basal diameter of antennal segment III ( Fig. 3F View FIGURE 3 ). Cauda broadly rounded, 0.3–0.55 times as long as its basal width, with 27–54 long and short setae ( Fig. 3G View FIGURE 3 ).

Alate viviparous female (n=13). Body dark green or black, eyes dark red, cover with numerous pointed setae, dark dorsal cross-bars on abdominal tergites in life ( Fig. 7D View FIGURE 7 ).

Mounted specimens: Body elongated ( Fig. 4A View FIGURE 4 ), 2.22–3.69 mm long, 2.04–2.71 times as long as its width. Dorsum of head and thorax, antennal segments I-II and distal 1/2 of antennal segments III-IV, coxae, distal 2/3 of hind femora, most of tibiae and siphunculi dark brown; basal 1/2 of antennal segments III-IV, antennal segments V-VI, apex of ultimate rostral segment, wing veins, basal 1/3 of hind femora and second tarsal segments brown; remaining parts of antennae and leg, cauda and other parts slightly paler. Dorsal head and thorax sclerotized, abdominal tergites cover with large fused spinal sclerites and oval marginal sclerites, pleural sclerites small and irregular placed. Tergites I-VIII each with 1 spinal band and 1 pair of marginal sclerites. Dorsal setae of body long and pointed. Head with 12–18 dorsal setae, up to 0.23 mm long; abdominal setae 0.08–0.25 mm long, spinal sclerites with 9–23 setae, pleural sclerites with 1 seta, marginal sclerites with 7–14 setae ( Fig. 4C View FIGURE 4 ).

Head. Frons flat, eyes with numerous facets ( Fig. 4B View FIGURE 4 ). Antennae 6-segmented ( Fig. 4D View FIGURE 4 ), long, with sparse imbrications on segments III – VI, 0.59–0.74 times as long as body. Processus terminalis 1.86–2.58 times as long as base of the segment VI; other antennal ratios: VI: III 0.53–0.65, V: III 0.37–0.45, IV: III 0.42–0.52. Segment I with 8–11 setae, segment II with 3–6 setae, segment III with 27–37 setae, segment IV with 9–15 setae, segment V with 9–13 setae, base of segment VI with 3–5 setae, processus terminalis with 2–4 apical setae. Antennal setae long and pointed, up to 0.17 mm long. Longest seta on segments III 2.83–3.4 times as long as basal articular diameter of the segment. Segment VI always bears a cluster of accessory sensoria. Segment V bears 1–2 primary sensorium. Segment III with 32–48 secondary rhinaria ( Fig. 4E View FIGURE 4 ). Rostrum reaching middle coxae. Apical segment of rostrum with 7–10 accessory setae ( Fig. 4G View FIGURE 4 ), 0.18–0.22 times as long as antennal segment III, 0.81–1.23 times as long as second hind tarsal segment.

Thorax. Leg normal and setose. Hind femora and tibiae bearing pointed, long and stout setae, which are 0.06– 0.23 mm long. Distal part of hind tibiae with few rows of stout spinules. Hind tibiae 0.48–0.58 time as long as body. First tarsal chaetotaxy: 5, 5, 5, sometimes 5, 4, 5, or 5, 4, 6. Second hind tarsal segment with 9–12 setae and 0.16–0.25 times as long as antennal segment III ( Fig. 4J View FIGURE 4 ). Fore wings typical, with normal venation ( Fig. 4F View FIGURE 4 ).

Abdomen. Siphunculi 0.09–0.14 mm long, with 6–14 rows of reticulations in apical part and well-developed flange, widest diameter 2.6–3.5 times as long as basal diameter of antennal segment III ( Fig. 4H View FIGURE 4 ). Cauda broadly rounded, 0.31–0.5 times as long as its basal width, with 37–51 long and short setae ( Fig. 4I View FIGURE 4 ).

Type material. Holotype: apterous viviparous female, Fuzhou , Fujian province, China, on K. paniculate , 26.III.2021, Qiang Li [20210326-1-10] ( FAFU) . Paratypes: 13 apterous viviparous females, Fuzhou, Fujian province, China, on K. paniculate , 26. III .2021 , Qiang Li [20210326-1-1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13,14]; 7 alate viviparous females, Fuzhou , Fujian province, China, on K. paniculate , 26. III .2021 , Qiang Li [20210326-1-15, 16, 17, 18, 19, 20, 21]; 2 apterous viviparous females, Fuzhou , Fujian province, China, on K. bipinnata , 11.IV.2016, Xiaolei Huang [20160411-10-1, 2]; 2 apterous viviparous females, Fuzhou , Fujian province, China, on K. bipinnata , 9. V .2016 , Xiaolei Huang [20160509-8-1, 2]; 1 apterous viviparous females, Fuzhou , Fujian province, China, on K. bipinnata , 18. III .2017 , Xiaolei Huang [20170318-2-1]; 2 apterous viviparous females, Fuzhou , Fujian province, China, on K. bipinnata , 28. III .2017 , Xiaolei Huang [20170328-14-1, 2]; 6 apterous viviparous females, Nanchang , Jiangxi province, China, on K. paniculate , 2.IV.2016, Xiaolei Huang [20160402-1-1, 2, 3, 4, 5, 6]; 6 alate viviparous females, Nanchang , Jiangxi province, China, on K. paniculate , 14.v.2021, Qiang Li [20210514-5-1, 2, 3, 4, 5, 6] ( FAFU) .

Distribution. China: Fujian province, Jiangxi province.

Biology. The new species lives on the underside of leaves and young branches of K. paniculate and K. bipinnata ( Fig. 7C, D View FIGURE 7 ). The species is endemic to subtropical humid areas of eastern and southeastern China.

Etymology. The species name is in honor of the late Dr. Roger Blackman for his tremendous contribution to the knowledge of the world aphid fauna. His “Aphids on the World’s Plants” books co-authored with Dr. Victor Eastop and the constantly updated Aphids on the World’s Plants website (http://www.aphidsonworldsplants.info/) are classic references for entomologists.

Remarks. Molecular diagnosis: nucleotides 312 G, 492 T, 594-595 CT. The new species is similar to P. koelreuteriae in BL, Ant I, Ant II, Ant III, Ant III W, Ant L, Cauda BW, but differs from P. koelreuteriae in BW, ARS, Ant IV, Ant V, Ant VI BL, Ant VI PT, Ant VI, HFEM, HTIB, HT II, SIPH, SHIP WD, reticulations, Cauda L. In addition, this new species is mainly distributed in the subtropical humid areas and can feed on both K. paniculate and K. bipinnata .