Uroleucon (Lambersius) grindeliae sp. nov.

urn:lsid:zoobank.org:act: 714DE06E-C8CB-4404-8FDA-569C01524ADC

Figs 1, 3, Table 1

Diagnosis

Apterous viviparous females of Grindelia -feeding Lambersius share the following combinations of characters: PT 3.31–3.61 ×BASE; ANT III with 7–16 secondary rhinaria (Fig. 3 a–b); URS 1.03– 1.37 ×BASE and 1.19–1.37×HT II with 6–9 short, fine, pointed accessory setae (Fig. 3d); HT I with 5:5:5 setae; SIPH subcylindrical, slightly tapering without a flange (Fig. 3e); its reticulated zone 0.27– 0.31 ×SIPH. SIPH 1.37–1.77 × cauda and 0.24–0.30 ×BL; scleroites on setal bases absent on ABD I–V, while the setae on ABD VI–VIII arising from barely visible, rounded scleroites; cauda tongue-shaped with evident constriction near its base and with 9–12 setae (Fig. 3f).

Etymology

The name of the new species is derived from the host plant genus Grindelia.

Material examined

Holotype

USA • ♀ apterous viviparous; Oregon, Salt Marsh, near Newport; 44°39′ N, 124°1′ W; alt. 113 m; 19 Apr. 1980; Hille Ris Lambers leg.; Grindelia stricta (= G. hirsutula); NHMUK 010121473.

Paratypes

USA • 1 ♀ alate viviparous; same collection data as for holotype; NHMUK 010121473 • 2 ♀♀ apterous, 2 ♀♀ alate viviparous; same collection data as for holotype; NHMUK 010121465 • 1 ♀ apterous viviparous, 1 ♀ alate viviparous; same collection data as for holotype; NHMUK 010121476 • 1 ♀ apterous viviparous, 1 ♀ alate viviparous; same collection data as for holotype; NHMUK 010121478 • 1 ♀ apterous viviparous, 1 ♀ alate viviparous; same collection data as for holotype; NHMUK 010121474 • 1 ♀ apterous viviparous, 1 ♀ alate viviparous; same collection data as for holotype; NHMUK 010121475 • 1 ♀ apterous viviparous, 1 ♀ alate viviparous; same collection data as for holotype; NHMUK 010121477 • 3 ♀♀ apterous viviparous, 2 ♀♀ alate viviparous; same collection data as for holotype; DZUS 010121479 • 1 ♀ apterous, 1 ♀ alate viviparous; same collection data as for holotype; NHMUK 010121480.

Description

Apterous viviparous female (n = 12)

COLOR IN LIFE. Unknown.

PIGMENTATION OF CLEARED SPECIMENS ON SLIDE. Body generally yellow to pale brown; ANT yellow with light brown ANT III (very basal part pale) or ANT yellow with darker apices of ANT III–V; coxae and trochanters pale; femora of legs yellow with very distal part light brown or uniformly yellow; tibiae yellow to light brown with slightly darker distal ends; tarsi light brown; SIPH pale to yellow with darker distal half; cauda pale (Fig. 1b).

MORPHOMETRIC CHARACTERS. HW 0.20–0.25 ×ANT. Head with thick, rigid setae with flat or narrowly capitate apices, 0.035 –0.049 mm long. ANT tubercles each with 3 setae. ANT 0.82–0.96 ×BL. ANT III with 7–16 rounded secondary rhinaria of different sizes with sclerotized rims (Fig. 3 a–b), ANT IV longer than ANT V. PT 3.31–3.61×BASE (Fig. 3c). Other antennal ratios: VI:III 0.90–1.18, V:III 0.57– 0.66, IV:III 0.65–0.72, PT:III 0.70–0.92, PT:IV 1.07–1.35 and PT:V 1.22–1.35. ANT chaetotaxy: ANT bearing thick, rigid setae with blunt or narrow capitate apices. ANT III setae 0.020 –0.042 mm long, LS ANT III 1.00–1.20 ×BD III. ANT I with 4–6, ANT II with 3–4, ANT III with 12–15, ANT IV with 6–10 and ANT V with 5–8 setae. ANT VI with 3–4 basal, 3–4 apical and 3–5 setae on PT. Rostrum reaching hind coxae. URS 0.22–0.31×ANT III, 0.23–0.30×ANT VI, 0.29–0.38× PT, 1.03–1.37× BASE and 1.19–1.37×HT II with 6–9 short, fine, pointed accessory setae (Fig. 3d). Mesosternal furca fused, wide, T-shaped. Hind femora bearing medium length, thick, rigid setae with narrow capitate or slightly pointed setae, 0.020 –0.040 mm long. Hind tibiae bearing thick, rigid setae with mostly slightly pointed or blunt, shorter than width of tibiae, 0.025 –0.050 mm long. HT I with 5:5:5 setae, HT II 0.18–0.23 ×ANT III, 0.18–0.21×ANT VI, 0.23–0.27 ×PT and 0.80–1.00×BASE. SIPH subcylindrical, slightly tapering, straight with distinct zone of subapical reticulation and without a flange (Fig. 3e). Reticulated zone 0.27– 0.31 ×SIPH. SIPH 1.37–1.77×cauda, 0.24–0.30 ×BL and 1.08–1.33 ×ANT III. Abdomen membranous with medium length, thick rigid setae with narrowly capitate or blunt apices, 0.035 –0.045 mm long on ABD I-V and 0.035 –0.050 mm long on ABD VI–VIII. ABD VIII with 4 setae. Scleroites on setal bases absent on ABD I–V, while setae on ABD VI–VIII arising from very poorly visible, rounded and pale scleroites. Genital plate with two anterior setae longer than others, 7–10 posterior setae. Cauda tongueshaped with evident constriction near base, 1.55–2.52×its width at base and 0.14–0.19× BL, with 9–12 long and fine setae (Fig. 3f).

Alate viviparous female (n = 11)

COLOR IN LIFE. Unknown.

PIGMENTATION OF CLEARED SPECIMENS ON SLIDE. Head and thorax slightly sclerotized, pale to pale yellow; ANT yellow with light brown ANT III (except base) and brown basal part of ANT IV; coxae and trochanters pale; femora of legs yellow with very distal ends light; tibiae brown with paler middle section; tarsi yellow to light brown; SIPH yellow to brown with paler bases; cauda pale (Fig. 1c).

MORPHOMETRIC CHARACTERS. HW 0.18–0.20×ANT. Head with thick rigid setae with blunt or narrow capitate apices, 0.020 –0.035 mm long. ANT tubercles each with 2–4 setae. ANT 0.81–1.13× BL. ANT III with 20–26 rounded secondary rhinaria of different sizes with sclerotized rims, ANT IV longer than ANT V. PT 3.33–3.83× BASE. Other antennal ratios: VI:III 0.89–1.09, V:III 0.62–0.68, IV:III 0.65– 0.76, PT:III 0.70–0.84, PT:IV 1.06–1.11 and PT:V 1.09–1.22. ANT bearing medium length thick and rigid setae with blunt or narrowly capitate apices. ANT III setae 0.020 –0.040 mm long, LS ANT III 0.94–1.33 ×BD III. ANT I with 5–6, ANT II with 3–4, ANT III with 12–16, ANT IV with 7–10, ANT V with 7–8 setae. ANT VI with 3–4 basal, 4–5 apical and 3–4 setae on PT. Rostrum reaching mesosternum. URS 0.23–0.26×ANT III, 0.23–0.28 ×ANT VI, 0.31–0.35×PT, 1.03–1.37 ×BASE and 1.29–1.41 ×HT II with 7–9 fine-pointed accessory setae. Hind femora bearing medium length, thick rigid setae with narrowly capitate or slightly pointed setae, 0.020 –0.037 mm long. Hind tibiae bearing thick, rigid setae with most slightly pointed or blunt, shorter than width of tibiae, 0.025 –0.050 mm long. HT I with 5:5:5 setae, HT II 0.17–0.19 ×ANT III, 0.18–0.20×ANT VI, 0.23–0.25× PT and 0.78–0.97 ×BASE. SIPH subcylindrical, slightly tapering, straight with distinct zone of subapical reticulation and without a flange. Reticulated zone 0.32–0.40×SIPH. SIPH 1.55–1.71 ×cauda, 0.22–0.29×BL and 0.89– 1.00 ×ANT III. Abdomen membranous with medium length thick, rigid setae with narrowly capitate or blunt apices, 0.025 –0.045 mm long on ABD I–V and 0.030 –0.052 mm long on ABD VI-VIII. ABD VIII with 4 setae. Scleroites on setal bases absent on ABD I–V, while setae on ABD VI–VII arising from very poorly visible, rounded scleroites. Genital plate with two anterior setae longer than others, 8–10 posterior setae. Cauda tongue-shaped with evident constriction near base, 1.95–2.92×its width at base and 0.12–0.18×BL with 9–12 long, fine setae.

Remarks

Of the six Grindelia -feeding aphids of Uroleucon, only U. penderum, U. robinsoni sp. nov. and U. grindeliae sp. nov. have shared characters: (1) ANT III has the majority of the secondary rhinaria on the basal half, (2) their URS/HT II ratio is 1.15 or more and (3) the coxae and trochanters are pale (Robinson 1986; Blackman & Eastop 2020).

The apterous viviparous females of U. grindeliae sp. nov. differ from the same morphs of U. penderum and U. robinsoni sp. nov. in the following characters: (1) their ANT PT/BASE ratio is 3.31–3.58 in U. grindeliae, while it is 3.6–6.5 in U. penderum and U. robinsoni and (2) their ANT PT/CAUDA ratio is 1.00– 1.20 in U. grindeliae, while it is 1.5–2.0 in U. penderum and U. robinsoni (Blackman & Eastop 2020).

Biology and distribution

Representatives of this species live on Grindelia hirsutula in Oregon, USA. Other morphs and the life cycle of the new species are unknown.