Periphyllus guangxuei 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 : 228-231

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.7070170
persistent identifier	https://treatment.plazi.org/id/03BCCE67-3A5B-FFB7-AB9D-51B9FD3F9652
treatment provided by	Plazi
scientific name	Periphyllus guangxuei Li & Huang
status	sp. nov.

Treatment

Periphyllus guangxuei Li & Huang sp. nov.

( Figs. 5–6 View FIGURE 5 View FIGURE 6 , 7 View FIGURE 7 & Table S2 View TABLE S )

Apterous viviparous female (n=8). Body light green, relatively smaller dark brown dorsal spot extending from the head to abdominal tergites in life ( Fig. 7E View FIGURE 7 ).

Mounted specimens: Body oval ( Fig. 5A View FIGURE 5 ), 2.07–2.68 mm long, 1.86–2.17 times as long as its width. Distal 1/2 of antennal segments V, base of the segment VI, distal 1/2 of hind tibiae, second hind tarsal segment, siphunculi and apex of ultimate rostral segment dark brown; dorsum of head and thorax, antennal segments I-IV, basal 1/2 of antennal segments V and remaining part of leg brown; cauda and other part of body pale brown. Pale brown sclerites on abdomen always present ( Fig. 5C View FIGURE 5 ). Abdominal tergites I-VIII each with 1pair of marginal sclerites and 1 spinal sclerites, pleural sclerites small and irregularly placed on each tergite. Setae on body dorsum stout and pointed. Dorsum of head with 10–12 setae, up to 0.2 mm long; abdominal setae 0.07–0.24 mm long, spinal sclerites with 2–7 setae, pleural sclerites with 1–2 setae, marginal sclerites with 7–12 setae.

Head. Frons flat, eyes with numerous facets ( Fig. 5B View FIGURE 5 ). Antennae 6-segmented ( Fig. 5D View FIGURE 5 ), long, with imbrications on segments III-VI, 0.54–0.68 times as long as body. Processus terminalis 2–2.9 times as long as basal part of the last antennal segment; other antennal ratios: VI: III 0.73–1.22, V: III 0.42–0.56, IV: III 0.44–0.59. Segment I with 5–8 setae, segment II with 3–4 setae, segment III with 14–25 setae, segment IV with 7–11 setae, segment V with 5–10 setae, base of segment VI with 2–4 setae, processus terminalis with 4 apical setae. The setae of antenna fine and pointed, up to 0.13 mm long. Length of longest seta on segment III 3.6–4.5 times as long as basal articular diameter of the segment. Rostrum reaching over middle coxae ( Fig. 5E View FIGURE 5 ). Apical segment of rostrum with 7–8 setae, 0.2–3.4 times as long as antennal segment III, 0.77–1 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 0.07–0.16 mm long. Distal part of hind tibiae with few rows of stout spinules. Hind tibiae 0.36–0.51 times as long as body. First tarsal chaetotaxy: 5, 5, 5, sometimes 4, 5, 5 ( Fig. 5H View FIGURE 5 ). Second hind tarsal segment with 10–12 setae and 0.22–0.34 times as long as antennal segment III.

Abdomen. Siphunculi 0.1–0.15 mm long, with 1–2 rows of subapical reticulations and slightly flared apex, widest diameter 3.25–5 times as long as basal diameter of antennal segment III ( Fig. 5F View FIGURE 5 ). Cauda broadly rounded, 0.39–0.62 times as long as its basal width, with 34–38 long and short setae ( Fig. 5G View FIGURE 5 ).

Alate viviparous female (n=11). Body black with broad dark dorsal abdominal cross bars scarcely separated between segments, cover with numerous pointed setae in life ( Fig. 7F View FIGURE 7 ).

Mounted specimens: Body elongated ( Fig. 6A View FIGURE 6 ), 2.26–2.6 mm long, 2.35–2.98 times as long as its width. Dorsum of head and thorax, distal 1/2 of hind femora, tibiae and siphunculi dark brown; antennal segments I-II, distal 1/2 of antennal segments III-IV, antennal segment V-VI, wing veins, distal 1/2 of front and middle femora, apex of ultimate rostral segment brown; remaining part of rostrum and leg, cauda and other part of body pale brown. Dorsal head and thorax sclerotized, abdominal tergites cover with large fused spinal sclerites and oval marginal sclerites, pleural sclerites small and irregular placed ( Fig. 6C View FIGURE 6 ). Tergites I-V each with 1 spinal band and 1 pair of marginal sclerites; Tergites VI and VII each with 2 spinal band and 1 pair of marginal sclerites; tergite VIII with 1 spinal sclerites. Dorsal setae of body long and pointed. Head with 10–11 dorsal setae, up to 0.2 mm long; abdominal setae 0.08–0.22 mm long, spinal sclerites with 10–21 setae, pleural sclerites with 1 seta, marginal sclerites with 6–11 setae.

Head. Frons flat, eyes with numerous facets ( Fig. 6B View FIGURE 6 ). Antennae 6-segmented ( Fig. 6D View FIGURE 6 ), long, with sparse imbrications on segments III-VI, 0.66–0.76 times as long as body. Processus terminalis 2.5–3.5 times as long as base of the segment VI; other antennal ratios: VI: III 0.68–0.82, V: III 0.41–0.52, IV: III 0.41–0.5. Segment I with 6–9 setae, segment II with 3–4 setae, segment III with 17–23 setae, segment IV with 6–10 setae, segment V with 6–10 setae, base of segment VI with 2 setae, processus terminalis with 4 apical setae. Antennal setae long and pointed, up to 0.13 mm long. Longest seta on segments III 2.6–3.25 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 29–37 secondary rhinaria ( Fig. 6E View FIGURE 6 ). Rostrum reaching middle coxae. Apical segment of rostrum with 7–9 accessory setae ( Fig. 6G View FIGURE 6 ), 0.17–0.2 times as long as antennal segment III, 0.77–0.85 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 0.08– 0.15 mm long. Distal part of hind tibiae with few rows of stout spinules. Hind tibiae 0.48–0.55 time as long as body. First tarsal chaetotaxy: 5, 5, 5, sometimes 4, 5, 5. Second hind tarsal segment with 9–12 setae ( Fig. 6J View FIGURE 6 ) and 0.2–0.24 times as long as antennal segment III. Fore wings typical, with normal venation ( Fig. 6F View FIGURE 6 ).

Abdomen. Siphunculi 0.07–0.14 mm long, with 8–12 rows of reticulations in apical part and well-developed flange, widest diameter 2–4.75 times as long as basal diameter of antennal segment III ( Fig. 6H View FIGURE 6 ). Cauda broadly rounded, 0.38–0.55 times as long as its basal width, with 34–48 long and short setae ( Fig. 6I View FIGURE 6 ).

Type material. Holotype: apterous viviparous female, Kunming, Yunnan province, China, on K. bipinnata , 25.V.2021, Qiang Li [20210525-3-1] ( FAFU) . Paratypes: 4 apterous viviparous females, Kunming, Yunnan province, China, on K. bipinnata , 10.X.2017, Zhixiang Liu [HLY-8-12, 13, 14, 15]; 3 apterous viviparous females, Kunming, Yunnan province, China, on K. bipinnata , 25. V.2021, Qiang Li [20210525-3-2, 3, 4]; 11 alate viviparous females, Kunming, Yunnan province, China, on K. bipinnata , 10.X.2017, Zhixiang Liu [HLY-8-1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] ( FAFU).

Distribution. China: Yunnan province (Kunming).

Biology. The new species is exclusively associated with K. bipinnata and feeds on the underside of leaves and young branches. The species is endemic to subtropical highland region in Yunnan of southwest China.

Etymology. The species name is in honor of Prof. Guangxue Zhang for his great contribution to the knowledge of aphid fauna and the development of aphid research in China.

Remarks. Molecular diagnosis: nucleotides 312 C, 492 A, 594-595 TC. The new species is similar to P. koelreuteriae in Ant VI, Cauda L, but there are significant differences in morphometry, especially BL, BW, ARS, Ant I, Ant II, Ant III, Ant III W, Ant IV, Ant V, Ant VI BL, Ant VI PT, Ant L, HFEM, HTIB, HT II, SIPH, SHIP WD, reticulations, Cauda BW. This new species is exclusively feeds on K. bipinnata and mainly distributed in the subtropical highland region of southwest China.