Uroleucon, Mordvilko, 1914

Barjadze, Shalva & Kanturski, Mariusz, 2020, Two new species of the aphid genus Uroleucon (Hemiptera: Aphididae) living on Grindelia in the USA, European Journal of Taxonomy 729, pp. 42-53 : 51

Key to the apterae of Uroleucon on Grindelia spp.

Note: the key is modified from that of Blackman & Eastop (2020)

7. SIPH entirely dark ........................................................................ Uroleucon chani Robinson, 1985

– SIPH pale, at least on basal part ( Figs 2e , 3e ) .................................................................................. 8

8. ANT III with 12–31 rhinaria extending to 0.80–0.98 from base with majority on distal half ........... ............................................................................................... Uroleucon richardsi ( Robinson, 1964)

– ANT III with 5–26 rhinaria extending to 0.4–0.8 from base with majority on the basal half ( Figs 2a , 3a ) ..................................................................................................................................................... 9

9 R IV+V 0.9–1.2×HT II, with 6–10 accessory hairs. SIPH 1.85–2.5× cauda. ANT PT/BASE 3.2– 5.7 ................................................................................................................................................... 10

– R IV+V 1.15–1.5 ×HT II with 7–13 accessory hairs ( Figs 2d , 3d ). SIPH 1.5–2.6 ×cauda. ANT PT/ BASE 3.0–5.2 ..................................................................................................................................11

10. Siphunculi pale at base, dark over most of their length. Distal caudal hairs usually short and blunt or capitate. Dorsal cephalic hairs 18–35 μm long ................. Uroleucon erigeronense (Thomas, 1878)

– Siphunculi pale. Distal caudal hairs pointed. Dorsal cephalic hairs 45–55 μm long ......................... ......................................................................... Uroleucon payuniense Ortego & Nieto Nafría, 2007

11. ANT PT/BASE 3.31–3.58. ANT PT 1.0–1.2×cauda .. Uroleucon (Lambersius) grindeliae sp. nov.

– ANT PT/BASE 3.6–5.2. ANT PT 1.5–2.0 ×cauda ......................................................................... 12

12. SIPH 2.30–2.68×cauda. R IV+V 1.18–1.25×HT II. Tibiae dusky/dark for most of their length ( Fig. 1a ) ......................................................................... Uroleucon (Lambersius) robinsoni sp. nov.

– SIPH 1.65–1.95×cauda. R IV+V 1.3–1.6 ×HT II. Tibiae pale except at apices ................................ ................................................................................................ Uroleucon penderum Robinson, 1986

Figures

Fig. 2. Uroleucon (Lambersius) robinsoni sp. nov., holotype, apterous viviparous female (NHMUK 010121495). a. ANT III. b. Secondary rhinaria on ANT III. c. ANT VI. d. Ultimate rostral (III–V) segments. e. Siphunculus. f. Cauda.

Fig. 3. Uroleucon (Lambersius) grindeliae sp. nov., paratype, apterous viviparous female (NHMUK 010121474). a. ANT III. b. Secondary rhinaria on ANT III. c. ANT VI. d. Ultimate rostral (III–V) segments. e. Siphunculus. f. Cauda.

Fig. 1.New speciesofUroleucon Mordvilko, 1914feeding on Grindelia Willd. a. Uroleucon (Lambersius) robinsoni sp. nov., holotype, apterous viviparous female (NHMUK 010121495) b. U. (L.) grindeliae sp. nov., holotype, apterous viviparous female (NHMUK 010121473) c. U. (L.) grindeliae sp. nov., paratype, alate viviparous female (NHMUK 010121477).