Aphis (Aphis) thomasi ( Börner, 1950 )

Kanturski, Mariusz & Bezděk, Aleš, 2019, The Knautia feeding species of Aphis (Insecta: Hemiptera: Aphididae) with notes on Aphis knautiae Holman nomen nudum, Bonn zoological Bulletin 68 (2), pp. 189-203 : 201-202

publication ID	https://doi.org/10.20363/BZB-2019.68.2.189
publication LSID	lsid:zoobank.org:pub:7EF7A263-F535-43F7-B6E5-94012D1CE048
persistent identifier	https://treatment.plazi.org/id/03A687E8-FFDB-FFF5-FF61-F214C5BFF993
treatment provided by	Felipe
scientific name	Aphis (Aphis) thomasi ( Börner, 1950 )
status

Treatment

Aphis (Aphis) thomasi ( Börner, 1950) View in CoL

Doralina thomasi Börner, 1950: 7 View in CoL

Figs 1–7 View Fig View Fig View Fig View Fig View Fig View Fig View Fig ; Supplementary tables 1–4

Apterous viviparous female (n=12).

Colour in life: straw yellow ( Blackman & Eastop, 2019); pigmentation on slide: head sclerotized, light brown. Antennae light brown with pale basal half of ANT III and base of ANT IV. Tibiae of legs light brown with slightly paler basal distal parts, tibiae light brown to pale with light brown apical parts, tarsi light brown. Abdomen yellow with light brown SIPH, cauda and anal plate ( Fig. 1d View Fig ). HW 0.47–0.58 × ANT. Head setae 0.005 –0.010 mm long, 0.25–0.29 × BD III. ANT 0.49– 0.54 × BL. ANT IV as long as or shorter than ANT V. ANT VI with PT 2.00–3.20 × BASE. Other antennal ra- tios: VI:III 1.42–2.10, V:III 0.50–0.69, IV:III 0.46–0.60, PT:III 1.00–1.60, PT:IV 1.90–2.66, PT:V 1.66–2.26. ANT bearing very short and blunt setae ( Fig. 5j View Fig ). ANT III setae shorter than the width of the segment, 0.003 – 0.007 mm long, LS III 0.25–0.65 × BD III. ANT I with 3–6, ANT II with 3–5, ANT III with 4–6, ANT IV with 2–3, ANT V with 1–4, ANT VI with 1–2 basal setae. Rostrum reaching to ABD I. URS 0.65–0.80 × ANT III, 0.38–0.46 × ANT VI, 0.50–0.70 × PT, 1.40–1.60 × BASE and 1.31–1.66 × HT II. Mesosternal furca slightly fused, wide. III FEMORA bearing very short, rigid and blunt setae ( Fig. 5k View Fig ), 0.005 –0.007 mm long, III FEM- ORA LS 0.12–0.25 × trochantero-femoral suture length. Posterior seta on hind trochanter 0.18–0.25 × trochantero-femoral suture length ( Fig. 5l View Fig ). III TIBIAE bearing short rigid and blunt setae, 0.005 –0.025 mm long. HT II 0.43–0.60 × ANT III, 0.25–0.35 × ANT VI, 0.37–0.50 × PT and 0.92–1.20 × BASE. SIPH 1.09–1.60 × cauda, 0.11–0.16 × BL, and 0.80–1.53 × ANT III. Setae on ABD I–V 0.006 –0.010 mm long, 0.30–0.44 × BD III. Setae on ABD VI–VIII 0.007 –0.025 mm long, 0.37–0.73 × BD III. Genital plate anterior setae 0.010 –0.035 mm long, 0.50–1.47 × BD III. Cauda with 6–8 setae GoogleMaps .

Alate viviparous female (n=2).

Colour in life: unknown; pigmentation on slide: head sclerotized, brown. Antennae yellow or light brown with paler basal parts of ANT III–VI BASE. Femora of legs uniformly light brown with pale distal parts. Tibiae pale with light brown distal parts of tibiae and light brown tarsi. Abdomen pale with light brown SIPH, cauda and anal plate ( Fig. 2c View Fig ). HW 0.35–0.36 × ANT. Head setae 0.008 – 0.010 mm long, about 0.66 × BD III. ANT 0.62–0.65 × BL. ANT III with 8–10 secondary rhinaria. ANT IV as long as or shorter than ANT V, with 2–4 secondary rhi- naria. ANT V sometimes with one secondary rhinarium. ANT VI with PT 2.30–2.53 × BASE. Other antennal ra- tios: VI:III 1.43–1.52, V:III 0.59–0.65, IV:III 0.56–0.59, PT:III 1.00–1.09, PT:IV 1.76–1.84, PT:V 1.53–1.84. ANT bearing very short and blunt setae. ANT III setae shorter than the width of the segment, 0.005 –0.010 mm long, LS III 0.60–0.66 × BD III. ANT I with 4–5, ANT II with 4, ANT III with 5–6, ANT IV with 3–4, ANT V with 3–4, ANT VI with 1–3 basal setae. Rostrum reach- ing hind coxae. URS 0.45–0.50 × ANT III, 0.31–0.32 × ANT VI, about 0.45 × PT, 1.05–1.15 × BASE and 1.22–1.23 × HT II. III FEMORA bearing short, rigid and blunt setae, 0.007 –0.012 mm long, III FEMORA LS 0.31–0.35 × trochantero-femoral suture length. Posterior seta on hind trochanter 0.31–0.39 × trochantero-femoral suture length. III TIBIAE bearing short rigid and blunt setae, 0.010 –0.022 mm long. HT II 0.36–0.40 × ANT III, 0.25–0.26 × ANT VI, 0.36–0.37 × PT and 0.85–0.94 × BASE. Abdomen with sclerite on ABD I, large marginal plates on ABD II–IV and small ones on ABD V, which is without presiphuncular sclerites. ABD VI with large postsiphuncular sclerites and very small spinal sclerite. ABD VII with wide spino-pleural plate. ABD I and VII with visible marginal tubercles ( Fig. 7c View Fig ). SIPH 1.09–1.61 × cauda, 0.08–0.11 × BL, and 0.54–0.73 × ANT III. Setae on ABD I–V 0.007 –0.012 mm long, 0.50–0.66 × BD III. Setae on ABD VI–VIII 0.010 –0.017 mm long, about 0.66 × BD III. Genital plate anterior setae 0.012 –0.015 mm long, 0.83–1.00 × BD III. Cauda with 5–8 setae ( Fig. 7c View Fig ).

Oviparous female. Description (n=9).

Colour in life: unknown; pigmentation on slide: head sclerotized, light brown. Antennae yellow or light yellow with ANT I, ANT II, ANT V and ANT VI light brown. Femora yellow or light brown with paler proximal parts. Fore and middle tibiae yellow or light brown with dark- er distal parts and tarsi. Hind tibiae light uniformly light brown or with slightly darker apical half. Abdomen yel- low with light brown SIPH, cauda and anal plate ( Fig. 3c View Fig ). HW 0.51–0.56 × ANT. Head setae 0.005 –0.011 mm long, 0.28–0.37 × BD III. ANT 0.44–0.48 × BL. ANT IV as long as or slightly shorter than ANT V. ANT VI with PT 2.13–2.56 × BASE. Other antennal ratios: VI:III 2.35– 2.59, V:III 0.75–0.81, IV:III 0.60–0.81, PT:III 1.60–1.86, PT:IV 2.27–2.66, PT:V 2.00–2.27. ANT bearing very short and blunt setae. ANT III setae shorter than the width of the segment, 0.005 –0.075 mm long, LS III 0.28–0.58 × BD III. ANT I with 4–6, ANT II with 3–5, ANT III with 3–5, ANT IV with 3, ANT V with 3–4, ANT VI with 2–3 basal setae. Rostrum reaching hind coxae. URS 0.91–1.10 × ANT III, 0.36–0.46 × ANT VI, 0.51–0.68 × PT, 1.29–1.46 × BASE and 1.31–1.46 × HT II. Mesoster- nal poorly visible almost separated. III FEMORA bear- ing very short, rigid and blunt setae, 0.005 –0.010 mm long, III FEMORA LS 0.15–0.23 × trochantero-femoral suture length. Posterior seta on hind trochanter about 0.17 × trochantero-femoral suture length. III TIBIAE with 27–53 pseudosensoria, bearing short to medium in length, rigid and blunt setae, 0.007 –0.022 mm long. HT II 0.66–0.75 × ANT III, 0.28–0.31 × ANT VI, 0.39–0.46 × PT and 0.94–1.00 × BASE. SIPH 1.13–1.33 × cauda, 0.10–0.11 × BL, and 1.25–1.50 × ANT III. Setae on ABD I–V 0.005 –0.008 mm long, about 0.25–0.42 × BD III. Setae on ABD VI–VIII 0.010 –0.017 mm long, 0.50–0.80 × BD III. Genital plate anterior setae 0.017 –0.020 mm long, 0.87–1.14 × BD III. Cauda with 6–10 setae.

Male. Description (n=1).

Colour in life: unknown; pigmentation on slide: head sclerotized, light brown. Antennae light brown with paler basal part of ANT III. Legs yellow with lighter central parts of tibiae. Abdomen pale, SIPH light brown with paler basal parts, cauda and anal genitalia light brown ( Fig. 4c View Fig ). HW 0.49–0.52 × ANT. Head setae 0.008 – 0.010 mm long, about 0.40 × BD III. ANT 5–segment- ed, 0.57–0.60 × BL. ANT III with 10, ANT IV with 1–3 secondary rhinaria. ANT V with PT 2.28–3.00 × BASE. Other antennal ratios: V:III 1.45–1.48, IV:III 0.48–0.51, PT:III 1.03–1.09, PT:IV 2.00–2.25. ANT bearing very short and blunt setae. ANT III setae shorter than the width of the segment, 0.005 –0.006 mm long, LS III 0.30–0.50 × BD III. ANT I with 5, ANT II with 4, ANT III with 5–6, ANT IV with 3–4, ANT V with 1–2 basal setae. Rostrum reaching ABD III. URS 0.60–0.64 × ANT III, 0.41–0.43 × ANT VI, 0.55–0.62 × PT, 1.42–1.66 × BASE and about 1.42 × HT II. Mesosternal furca poorly visible, separated. III FEMORA bearing very short, rigid and blunt setae, 0.005 –0.007 mm long, III FEMORA LS about 0.16 × trochantero-femoral suture length. Posterior seta on hind trochanter about 0.22 × trochantero-femoral suture length. III TIBIAE bearing short, rigid and blunt setae, 0.005 –0.017 mm long. HT II 0.42–0.45 × ANT III, 0.29–0.30 × ANT V, 0.38–0.43 × PT and 1.00–1.16 × BASE. Abdomen with small marginal tubercles on ABD IV. SIPH 1.00–1.10 × cauda, 0.10–0.11 × BL, and 0.64– 0.66 × ANT III. Setae on ABD I–V 0.007 –0.010 mm long, 0,37–0.50 × BD III. Setae on ABD VI–VIII 0.010 – 0.015 mm long, 0.50–0.75 × BD III. Cauda with 6 setae.

Material examined. BULGARIA: Liljanovo (10 km E of Sandenski) reg. Blagoevgrad, 28 May 1990, on Scabiosa sp. , J. Holman leg., 4 apt, 21840 A (apt. 1–4), IECA; CZECH REPUBLIC: Luka p. Medníkem, 30 Sep- tember 1964, on S. canescens, J. Holman leg., 7 ♀, 8851 (♀ 9–15), IECA; POLAND: Augustów, 05 July 1967, on S. ochroleuca, S. Huculak leg., 1 apt, 1248, R838; ZMPA; Warszawa-Bielany, 30 September 1965, on S. ochloreuca, H. Szelegiewicz leg., 5 apt, 2991, R839, ZMPA; 2 apt, 2♀, 1 ♂, 2991, R839, 363, ZMPA; UKRAINE: Čatyrdag, Krimea, 21 July 1960, on S. gramuntia (= S. trandria ), J. Holman leg., 2 al, 3898 (al. 1–2), IECA.

Host plants. Knautia arvensis , Scabiosa sp. , S. argentea , S. atropurpurea , S. canescens , S. columbaria , S. comosa (= S. lachnophylla ), S. ochroleuca , S. triandra ( Holman, 2009) , Pycnocomon rutifolium ( Blackman & Eastop 2019) .

Biology. Aphis thomasi is a monoecious and holocyclic species with sexual phase in the end of September. The aphids live on basal parts on the host plants.

Distribution. Bulgaria, Czech Republic, Germany, Poland, Romania, Slovakia, Spain, Switzerland, Ukraine, probably Hungary (de Jong et al. 2014).