Uroleucon (Uroleucon) bulgaricum, Kanturski, Mariusz, 2021

Kanturski, Mariusz, 2021, New Achillea-Feeding Species Of The Aphid Genus Uroleucon (Hemiptera: Aphididae) From Bulgaria, Acta Zoologica Academiae Scientiarum Hungaricae 67 (3), pp. 223-234 : 225-228

Uroleucon (Uroleucon) bulgaricum sp. n.

( Figs 1–4)

Material examined: Holotype. Apterous viviparous female, Bulgaria, reg. Blagoevgrad, Elešnica near Rila , 09.09.1988, Achillea coarctata, J. Holman leg., 20519A (apt 8), IECA.

Paratypes. Apterous viviparous female, other data same as in holotype, 20519A (apt 9), IECA ; two apterous viviparous females, 09.09.1090, other data same as in holotype, 20519A (apt 27-28), IECA ; two apterous viviparous females, 09.09.1090, other data same as in holotype, 20519A (apt 35-36), IECA ; two apterous viviparous females, 09.09.1090, other data same as in holotype, 20519A (apt 53-54), IECA ; two apterous viviparous fe- males, 09.09.1090, other data same as in holotype, 20519A (apt 37-38), DZUS ; two apterous viviparous females, Rilski Manastir, 10.10.1988, A. coarctata, J. Holman leg., 20530 (apt 5-6), IECA ; two apterous viviparous females, other data same as in 20530 (apt 21-22), IECA.

Apterous viviparous female – description (n = 14) ( Figs 1–4, Table 1). Colour in life: unknown. Pigmentation on slide: head sclerotised, light brown; ANT I–II brown; ANT yellow with darker apical end of ANT III – IV, brown distal half of ANT V; pronotum and mesonotum usually with yellow sclerotisation; Femora of legs yellow with only the apices slightly dusky; tibiae yellow with dark distal parts, tarsi dark brown; abdomen yellow with brown sclerites and scleroites; SIPH uniformly dark brown, cauda yellow ( Fig. 1 a). HW 0.14–0.15 × ANT. Head with long, rigid and pointed setae, 0.070 –0.100 mm long. ANT tubercles each with 2–3 setae on internal angles. ANT 1.33–1.60 × BL. ANT III with 9–12 slightly protuberant, rounded, different-sized secondary rhinaria with well-developed sclerotised rims ( Fig. 2a, b), ANT IV longer than ANT V. PT 5.41 – 6.31 × BASE. Other anten- nal ratios: VI: III 1.44 – 1.67 , V: III 0.80–0.84, IV: III 0.86–0.92, PT: III 1.24 – 1.54 , PT: IV 1.42 – 1.53 , PT: V 1.50 – 1.67 . ANT chaetotaxy: ANT have thick, rigid setae with slightly blunt or narrow capitate apices. ANT III setae 0.02–0.06 mm long, LS ANT III 1.33 – 1.71 × BD III. ANT I with 7–8, ANT II with 4–5, ANT III with 15–18, ANT IV with 13–14, ANT V with 9–11 setae. ANT VI with 3 basal, 4 apical and 4–6 setae along the PT. Rostrum reaching hind coxae. URS 0.23–0.30 × ANT III, 0.16–0.18 × ANT VI, 0.18–0.21 × PT, 1.11–1.21 × BASE and 1.40–1.66 × HT II with 4–5 fine, pointed accessory setae ( Fig. 2 c). Mesosternal furca fused, wide, with- out stem ( Fig. 3 a). III FEMORA have medium-long to long, stiff, rigid and pointed setae, 0.020 –0.065 mm long. Setae on III TIBIAE with rigid, medium-long to long and pointed se- tae, 0.025 –0.075 mm long. HT I with 5:5:5 setae, HT II 0.15–0.18 × ANT III, 0.10–0.12 × ANT VI, 0.12–0.14 × PT and 0.70–0.81 × BASE. Abdomen membranous without marginal tuber- cles with long and rigid setae with pointed apices, 0.080 –0.130 mm long on ABD TERG I– V and 0.085 –0.130 mm long on ABD TERG VI – VIII. ABD VIII with 4–6 setae without sclerotised bar. Setae on abdomen arising from well-visible, rounded or slightly irregular scleroites, larger than setae bases ( Fig. 4a, c). SIPH tubular, tapering with a distinct zone of subapical reticulation, well-developed antesiphuncular and postsiphuncular sclerites and small flange ( Fig. 3d). Reticulated zone 0.22–0.30 × SIPH. SIPH 2.29 – 2.71 × cauda, 0.22–0.29 × BL and 0.76–0.87 × ANT III. Genital plate with 2–4 long anterior, 0–2 median and 7–13 shorter posterior setae. Cauda triangular, 1.56–1.75 × its width at base and 0.09–0.10 × BL with 7–9 long, thick and pointed setae ( Fig. 2e) .

Diagnosis. The new species is most similar to Uroleucon achilleae ( Fig. 1 b) because of the similar number of secondary rhinaria on ANT III, siphunculi and cauda ratios, the cauda length to width and the number of caudal setae. Additionally, the long, thick and rigid setae that arise from well-developed scleroites are both species-shared characters.

However, the apterous viviparous females of U. bulgaricum differ from those of U. achilleae in several apparent features such as:

stem, c = pigmentation of the distal part of the femur and proximal part of the tibia of U. bulgaricum , d = pigmentation of the distal part of the femur and the proximal part of the tibia of U. achilleae an apterous viviparous female of (mesosternal furca with a well-developed

Uroleucon bulgaricum . stem in U. achilleae ) ( Figs 3 a, b).

Character Apterous − Femora of legs are only slightly dusky viviparous female at the very apical tips (femora of legs brown

BL 1.95–2.70 to dark brown on about ¼ of their distal

HW 0.46–0.52 length in U. achilleae ) ( Figs 3 c, d). − Proximal part of the tibiae of the legs

ANT 3.12–3.62 yellow (proximal part of the tibiae brown to

ANT III 0.65–0.81 dark brown in U. achilleae ).

ANT IV 0.60–0.71 − ANT pale with distal ends of ANT

ANT V 0.55–0.67 IV and V brown and brown ANT VI (ANT

ANT VI 1.09–1.17 brown to dark brown with only basal and

BASE 0.16–0.17 central part of ANT III paler in U. achilleae ). − Antesiphuncular sclerites present (an-

PT 0.92–1.01 tesiphuncular sclerites absent in most repre-

URS 0.19–0.20 sentatives of U. achilleae as well as according

FEMORA III 0.95–1.17 to BLACKMAN (2010) ( Figs 4 a, b).

TIBIAE III 1.95–2.27 − Dorsal setae pointed (dorsal setae

HT II 0.12–0.13 blunt or capitate U. achilleae ) ( Figs 4c, d).

SIPH 0.57–0.67 − ABD VIII not sclerotised (ABD VIII

CAUDA 0.21–0.27 with a solid sclerotic bar in U. achilleae ). − Lower ratio of HT II:BASE, 0.70–0.81

(0.90–1.04 in U. achilleae ).

Etymology. The name of the species is derived from Bulgaria where it was collected. I have the pleasure to follow the naming of this species according to J. Holman’s suggestions and notes on the slides.

Host plant and biology. The species feeds on Achillea coarctata Poir. from the family Asteraceae , but nothing is known about the place where it feeds. Alate viviparous females and sexual morphs are as yet unknown.