Uroleucon (Lambersius) robinsoni, Barjadze, Shalva & Kanturski, Mariusz, 2020

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: 44-47

publication ID

https://doi.org/10.5852/ejt.2020.729.1189

publication LSID

lsid:zoobank.org:pub:5D9A5938-4858-4F8D-A50D-6E2CF5623E69

DOI

http://doi.org/10.5281/zenodo.4360944

persistent identifier

http://treatment.plazi.org/id/C7C38DD0-01C5-4BB4-9938-1D3CD3D8A81A

taxon LSID

lsid:zoobank.org:act:C7C38DD0-01C5-4BB4-9938-1D3CD3D8A81A

treatment provided by

Plazi

scientific name

Uroleucon (Lambersius) robinsoni
status

sp. nov.

Uroleucon (Lambersius) robinsoni  sp. nov.

urn:lsid:zoobank.org:act:C7C38DD0-01C5-4BB4-9938-1D3CD3D8A81A

Figs 1–2View FigView Fig, Table 1

Diagnosis

Apterous viviparous females of Grindelia  -feeding Lambersius  have the following combinations of characters: PT 4.66–6.50×BASE; ANT III with 12–21 secondary rhinaria ( Fig. 2View Fig a–b); URS 1.061.33 ×BASE and 1.18–1.25×HT II with 7–9 short, fine, pointed accessory setae ( Fig. 2dView Fig); HT I with 5:5:5 setae; SIPH subcylindrical, slightly tapering without a flange ( Fig. 2eView Fig); its reticulated zone 0.170.28 ×SIPH. SIPH 2.30–2.68 ×cauda and 0.31–0.41 ×BL; scleroites on setal bases absent on ABD I–V, while setae on ABD VI–VIII arise from barely visible, rounded scleroites; cauda narrow finger-shaped without constriction and with 7–9 setae ( Fig. 2fView Fig).

Etymology

We are very pleased to name the new species in honor of A.G. Robinson (University of Manitoba, Canada), who worked on the North American Macrosiphini  .

Material examined

Holotype

USA • ♀ apterous viviparous; Colorado, Carson Hole ; 38°43′ N, 108°36′ W; alt. 2348 m; 16 Sep. 1956; Hottes and Hille Ris Lambers leg.; Grindelia squarrosa  ; NHMUK 010121495.

GoogleMaps 

Paratypes

USA • 2 ♀♀ apterous viviparous; same collection data as for holotype; NHMUK 010121495 • 2 ♀♀ apterous viviparous; same collection data as for holotype; NHMUK 010121496GoogleMaps  2 ♀♀ apterous viviparous; same collection data as for holotype; DZUS 010121481GoogleMaps  2 ♀♀ apterous viviparous; same collection data as for holotype; NHMUK 010121482GoogleMaps  .

GoogleMaps 

Description

Apterous viviparous female (n = 9)

COLOR IN LIFE. Unknown.

PIGMENTATION OF CLEARED SPECIMENS ON SLIDE. Body generally membranous, pale to yellow; ANT brown with pale ANT I–II and basal part of ANT III; coxae and trochanters pale; femora yellow with light brown distal ends; tibiae brown with paler middle section or pale with only distal part darker; tarsi light brown; SIPH yellow with light brown to brown distal ends; cauda pale ( Fig. 1aView Fig).

MORPHOMETRIC CHARACTERS. HW 0.17–0.19 ×ANT. Head with thick, rigid setae with blunt or narrowly capitate apices, 0.030 –0.040 mm long. ANT tubercles each with 2–3 setae. ANT 0.83–1.04× BL. ANT III with 12–21 rounded secondary rhinaria of different sizes, with sclerotized rims ( Fig. 2View Fig a–b), ANT IV longer than ANT V. PT 4.66–6.50 ×BASE ( Fig. 2cView Fig). Other antennal ratios: VI:III 1.13–1.28, V:III 0.61– 0.70, IV:III 0.70–0.76, PT:III 0.93–1.11, PT:IV 1.22–1.47 and PT:V 1.32–1.69. ANT bearing medium length thick, rigid setae with blunt or narrowly capitate apices. ANT III setae 0.020 –0.045 mm long, LS ANT III 0.84–1.13×BD III. ANT I with 4–5, ANT II with 3–4, ANT III with 12–21, ANT IV with 8–12, ANT V with 7–9 setae. ANT VI with 3 basal, 4 apical and 2–5 setae on PT. Rostrum reaching middle coxae in some specimens to as far as hind coxae in other specimens. URS 0.21–0.24×ANT III, 0.17–0.20×ANT VI, 0.20–0.24 ×PT, 1.06–1.33× BASE and 1.18–1.25 ×HT II with 7–9 short, fine and pointed accessory setae ( Fig. 2dView Fig). Mesosternal furca fused, wide, T-shaped. Hind femora bearing medium length, thick, rigid setae with narrowly capitate or slightly pointed apices, 0.020 –0.040 mm long. Hind tibiae bearing thick, rigid setae, most slightly pointed or blunt, shorter than width of tibiae, 0.025 –0.045 mm long. In some specimens, tibiae bearing few pseudosensoria. HT I with 5:5:5 setae, HT II 0.18–0.19×ANT III, 0.14–0.16 ×ANT VI, 0.16–0.20 ×PT and 0.86–1.08 ×BASE. SIPH subcylindrical, slightly tapering and curved externally with distinct zone of subapical reticulation and without flange ( Fig. 2eView Fig). Reticulated zone 0.17–0.28×SIPH. SIPH 2.30–2.68 ×cauda, 0.31–0.41× BL, and 1.38–1.57×ANT III. Abdomen membranous with medium length, thick rigid setae with narrowly capitate or blunt apices, 0.025 –0.040 mm long on ABD I–V and 0.030 –0.040 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 narrow finger-shaped without constriction, 2.05–2.75 ×its width at base and 0.13–0.15 ×BL with 7–9 fine setae ( Fig. 2fView Fig).

Remarks

Of the six Grindelia  -feeding aphids of Uroleucon  , only U. penderum Robinson, 1986  , 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 and (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 Uroleucon robinsoni  sp. nov. differ from the same morphs of U. penderum  : (1) their SIPH/CAUDA L ratio is 2.30–2.68 in U. robinsoni  sp. nov., while it is 1.65–1.95 in U. penderum  , (2) their URS/HT II ratio is 1.18–1.25 in U. robinsoni  sp. nov., while it is 1.3–1.6 in U. penderum  , (3) the pigmentation of the tibiae is dusky or dark for most of their length in Uroleucon robinsoni  , while their tibiae are pale except at the apices in U. penderum ( Blackman & Eastop 2020)  .

The apterous viviparous females of the two new species differ from each other in the following characters: (1) their ANT PT/BASE ratio is 4.66–6.50 in U. robinsoni  sp. nov., while it is 3.31–3.61 in U. grindeliae  sp. nov., (2) their SIPH/CAUDA ratio is 2.30–2.68, while it is 1.37–1.77 in U. grindeliae  sp. nov. and (3) their cauda is finger shaped with no constriction in U. robinsoni  sp. nov. ( Fig. 2fView Fig), while it is tongue shaped with an evident constriction near the base in U. grindeliae  sp. nov. ( Fig. 3fView Fig).

Biology and distribution

The species was collected from Grindelia squarrosa  in Colorado, USA. Other morphs and the life cycle of the new species are unknown.