Periphyllus koelreuteriae
Creators: name: Li, Qiang
name: Wu, Liying
name: Cheng, Zhentao
name: Liu, Zhixiang
name: Huang, Xiaolei
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Aphididae
Periphyllus
Periphyllus koelreuteriae

description: Periphyllus koelreuteriae (Takahashi)
(Figs. 1–2, 7 & Table S2)
Chaitophorinella koelreuteriae Takahashi, 1919b: 247
Periphyllus koelreuteriae Shinji, 1941: 426; Li et al., 2021: 509
Re-description of apterous viviparous female (n=23). Body yellow, thorax spot and paired dorsal spots (dark brown) on abdominal tergites in life (Fig. 7A).
Mounted specimens: Body oval (Fig. 1A), 2.84–3.34 mm long, 1.67–2.13 times as long as its width. Antennal segments I-II and V-VI, distal 1/2 of antennal segments III-IV, apex of ultimate rostral segment, coxae, distal 2/3 of femora, most of tibiae and siphunculi dark brown; dorsum of head and thorax, basal 1/2 of antennal segments III-IV, basal 1/3 of femora and second tarsal segments brown; remaining part of rostrum and leg, cauda and other part pale brown. Brown sclerites on abdomen always present (Fig. 1C), 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. Setae on body dorsum long and pointed. Dorsum of head with 11–14 setae, up to 0.26 mm long; abdominal setae 0.11–0.29 mm long, spinal sclerites with 1–3 setae, pleural sclerites with 1 seta, marginal sclerites with 8–13 setae.
Head. Frons flat, eyes with numerous facets (Fig. 1B). Antennae 6-segmented (Fig. 1D), long, with imbrications on segments III – VI, 0.5–0.71 times as long as body. Processus terminalis 1.5–2.33 times as long as basal part of the last antennal segment; other antennal ratios: VI: III 0.49–0.71, V: III 0.43–0.58, IV: III 0.47–0.71. Segment I with 5–11 setae, segment II with 3–5 setae, segment III with 24–37 setae, segment IV with 9–14 setae, segment V with 7–12 setae, base of segment VI with 2 setae, processus terminalis with 3–4 apical setae. The setae of antenna fine and pointed, outer setae much longer than inner setae on segment III, up to 0.19 mm long. Length of longest seta on segment III 3.17–3.8 times as long as basal articular diameter of the segment. Rostrum reaching over middle coxae (Fig. 1E). Apical segment of rostrum with 7–10 setae, 0.19–0.27 times as long as antennal segment III, 0.68– 0.88 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 0.09–0.23 mm long. Distal part of hind tibiae with few rows of stout spinules. Hind tibiae 0.47–0.59 times as long as body. First tarsal chaetotaxy: 5, 5, 5, sometimes 4, 5, 5, or 5, 5, 4 (Fig. 1H). Second hind tarsal segment with 9–12 setae and 0.23–0.3 times as long as antennal segment III.
Abdomen. Siphunculi 0.1–0.18 mm long, with 3–7 rows of subapical reticulations and slightly flared apex (Fig. 1F), widest diameter 3.2–5.6 times as long as basal diameter of antennal segment III. Cauda broadly rounded, 0.28–0.5 times as long as its basal width, with 36–48 long and short setae (Fig. 1G).
Alate viviparous female (n=6). Body yellow, cover with numerous long and pointed setae, dark brown dorsal cross-bars on abdominal tergites in life (Fig. 7B).
Mounted specimens: Body elongated (Fig. 2A), 2.88–3.21 mm long, 2.18–2.71 times as long as its width. Dorsum of head and thorax, antennal segments I-II, distal 1/3 of antennal segments III, antennal segments IV-VI, coxae, distal 2/3 of hind femora, tibiae and siphunculi dark brown; basal 2/3 of antennal segments III, apex of ultimate rostral segment, wing veins, basal 1/3 of femora, second tarsal segments brown; cauda and remaining parts of body 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 (Fig. 2C). Tergites I-VIII each with 1 spinal band and 1 pair of marginal sclerites. Dorsal setae of body long and pointed. Head with 10–14 dorsal setae, up to 0.18 mm long; abdominal setae 0.24 mm long, spinal sclerites with 10–23 setae, pleural sclerites with 1 seta, marginal sclerites with 8–13 setae.
Head. Frons flat, eyes with numerous facets (Fig. 2B). Antennae 6-segmented (Fig. 2D), long, with imbrications on segments III-VI, 0.6–0.69 times as long as body. Processus terminalis 1.87–2.73 times as long as base of the segment VI; other antennal ratios: VI: III 0.62–0.66, V: III 0.45–0.49, IV: III 0.52–0.6. Segment I with 6–10 setae, segment II with 4 setae, segment III with 21–26 setae, segment IV with 9–16 setae, segment V with 8–11 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 2.17–2.6 times as long as basal articular diameter of the segment. Segment VI always bears a cluster of accessory sensoria. Segment V bears 1 primary sensorium. Segment III with 32–42 secondary rhinaria (Fig. 2E). Rostrum reaching middle coxae. Apical segment of rostrum with 8 accessory setae (Fig. 2G), 0.18–0.2 times as long as antennal segment III, 0.76–0.82 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 0.11– 0.2 mm long. Distal part of hind tibiae with few rows of stout spinules. Hind tibiae 0.53–0.6 time as long as body. First tarsal chaetotaxy: 5, 5, 5, sometimes 5, 5, 4. Second hind tarsal segment with 10–12 setae and 0.24–0.25 times as long as antennal segment III (Fig. 2J). Fore wings typical, with normal venation (Fig. 2F).
Abdomen. Siphunculi 0.12–0.15 mm long, with 7–14 rows of reticulations in apical part and well-developed flange, widest diameter 2.5–3.8 times as long as basal diameter of antennal segment III (Fig. 2H). Cauda broadly rounded, 0.36–0.48 times as long as its basal width, with 42–49 long and short setae (Fig. 2I).
Material examined. 23 apterous viviparous female, Beijing, China, on K. paniculate, 20.IV.2019, Xiaolei Huang [20190420-4-1, 2, 3; 20190420-5-1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,12; 20190420-6-1, 2, 3, 4, 5, 6, 7, 8]; 6 alate viviparous females, Beijing, China, on K. paniculate, 20.IV.2019, Xiaolei Huang [20190420-6-9, 10, 11, 12, 13, 14].
Distribution. Temperate areas of northern China, Japan and Korea of East Asia.
Biology. The species is exclusively associated with K. paniculate and feeds on the underside of leaves and young branches (Fig. 7A, B). The species and its host plant are endemic to temperate regions.
Remarks. Molecular diagnosis: nucleotides 312 A, 492 C, 594-595 TT. Periphyllus koelreuteriae was first described in Sapporo and Tokyo, Japan, which belongs to temperate climate zone. In this study, the specimens from the temperate areas are very similar to the original description of P. koelreuteriae, especially the body color and shape of dorsal spots on abdominal tergites in life, and both feed on K. paniculate.
description: Published as part of 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, pp. 220-238 in Zootaxa 5183 (1) on pages 222-224, DOI: 10.11646/zootaxa.5183.1.17, http://zenodo.org/record/7070146