Aphis umbrella ( Börner, 1950 )

Stekolshchikov, Andrey V. & Buga, Sergey V., 2017, The taxonomic status of Aphis rostellum (Zhang, Chen, Zhong & Li, 1999) and description of the fundatrix and sexual morphs of Aphis umbrella (Börner, 1950) (Hemiptera: Aphidoidea), Zootaxa 4347 (3), pp. 543-552 : 549-551

Detailed description of unknown morphs of Aphis umbrella ( Börner, 1950)

( Tabl. 4 , Figs. 4–14 )

Fundatrix. Body broadly elliptical, 1.54–1.72 (1.66) times as long as its width. Colour of living specimens unknown. Cleared specimens very light, almost not sclerotized, only with brown tarsi and the distal third of siphunculi and light-brown 5th and apices of 4th antennal segments, subgenital plate, and cauda. Numbers of marginal setae 0–1, 1–2, 1–3, 1–2, 1–3, 1–3 and 1 on each side of abdominal segments I–VII, respectively. Head with epicranial coronal suture or with traces of epicranial coronal suture. Antennae 5-segmented. Rostrum reaching mesothorax. Setae on subgenital plate blunt, pointed or finely pointed.

Male. Body elongated spindle-shaped ( Fig. 5 ), 2.22–2.73 (2.43) times as long as its width. Living specimens black with dark green abdomen, black siphunculi and dirty-olive cauda. Cleared specimens with dark brown head and thorax, with brown antennae, coxae of all legs, femora (except for bases), apices of tibiae, anal plate and cauda, with light-brown two last segments of rostrum, trochanters, tibiae (except for apices), tarsi, and siphunculi, and with very light-brown large marginal sclerites on I–VI abdominal segments and bands on VII–VIII abdominal segments. Surface of head smooth, of marginal maculae with short rows of large pointed spinules. Numbers of marginal setae 1, 2–3, 2–3, 1–2, 2, 2 and 1 on each side of abdominal segments I–VII, respectively. Setae on head finely pointed. Antennae 6-segmented ( Fig. 7 ), 3rd antennal segment with 13–25 (19.7–24.5), 4th with 13–31 (14.7–28.0) and 5th with 6–18 (9.5–17.0) secondary rhinaria. Chaetotaxy of first tarsal segments 3,3,2 or, rarely, 3,3,3. Siphunculi almost cylindrical and weakly imbricate ( Fig. 11 ).

Oviparous female. Body elliptical ( Fig. 4 ), 1.55–2.11 (1.61–1.89) times as long as its width. Living specimens dark-brown or dark olive with black siphunculi and dark brown cauda. Cleared specimens very light, almost not sclerotized, only with light-brown 6th antennal segments, two last segments of rostrum, hind tibia, anal plate, cauda, and sometimes apices of 5th antennal segments, and with brown tarsi, siphunculi or only apices of siphunculi and lobes of subgenital plates. Thorax and abdominal dorsum without any sclerotized bands, sclerites and maculae. Surface of dorsal side of head weakly reticulate, of thorax and abdominal tergites I–VI smooth with very rare spinules, of abdominal tergites VII–VIII with the long rows of small pointed spinules; surface of ventral side of abdomen with long rows of small pointed spinules. Setae on dorsal surface of thorax and abdominal tergites I–VII blunt, pointed or very weakly capitate, on abdominal tergite VIII and ventral surface of thorax and abdomen finely pointed; numbers of marginal setae 1–2, 1–3, 1–3, 1–3, 2, 1–2 and 1–2 on each side of abdominal segments I–VII, respectively. Marginal tubercles strongly protuberant from elongated semicircular up to papilliform, diameter of tubercles 0.7–1.7 times as long as high. Head with or without traces of epicranial coronal suture. Frontal tubercles not high, but distinctly marked, median tubercle rounded. Occipital and frontal setae on head blunt and pointed, setae on ventral side of head—blunt, pointed or finely pointed. Antennae 6- or 5-segmented ( Fig. 6 ), without secondary rhinaria. Setae on antennae blunt or pointed. Rostrum reaching metathorax. Ultimate rostral segment elongate wedge-shaped ( Fig. 8 ). Setae on legs blunt, pointed or finely pointed. Chaetotaxy of first tarsal segments 3,2,2, but sometimes first tarsal segments on one or two fore legs with 2 setae and on one or two middle legs with 3 setae. Arms of mesosternal furca separated. Siphunculi ( Fig. 12 ) elongate conic, with relatively wide base, weakly narrowed to the distal third, then slightly expanding to the apex, sometimes weakly curved outward, distinctly imbricate and with very small flange. Subgenital plate oval, setae on subgenital and anal plates finely pointed. Cauda ( Fig. 14 ) elongate triangular, with a more or less noticeable constriction at the middle and long finely pointed setae. Hind tibia ( Fig. 10 ) with 12–188 (98–162) round pheromone plates.

Figures

FIGURES 4 – 14. Aphis umbrella (Börner, 1950), male and oviparous female. 4, body of oviparous female; 5, abdomen of male; 6, antenna of oviparous female; 7, antenna of male; 8, ultimate rostral segments of oviparous female; 9, hind tarsus of oviparous female; 10, hind tibia of oviparous female; 11, siphunculus of male; 12, siphunculus of oviparous female; 13, cauda of male; 14, cauda of oviparous female.

Tables

TABLE 4. Biometric data for fundatrices, male and oviparous viviparous females of Aphis umbrella.

	Fundatrices	Males	Oviparous females
Number of samples / specimens	1/8	3/8	4/36
Length of body	1885–2309 (2053)	1107–1360 (1228–1291)	1255–1862 (1508–1820)
Length of antenna / body length	0.42–0.51 (0.46)	0.78–0.96 (0.87–0.95)	0.46–0.66 (0.50–0.62)
Number of marginal tubercles on abdominal segments II–VI	10–14 (12.1)	1–6 (1.7–3.7)	0–7 (0.0–6.0)
Setae on head length of occipital	16–21 (19)	16–28 (22)	13–25 (12–21)
length of frontal	19–26 (23)	18–30 (25)	20–41 (29)
on 3rd length antennal length / articular diameter of 3rd antennal segment segment	12–15 (14) 0.44–0.71 (0.60)	13–18 (15) 0.77–1.08 (0.89)	10–20 (15) 0.50–0.89 (0.59–0.70)
length of ventral seta on hind trochanter / basal diameter of hind femur	0.60–0.83 (0.71)	0.42–0.88 (0.63–0.78)	0.39–1.28 (0.55–0.94)
longest dorsal on hind tibia / mid-diameter of the hind tibia	0.54–1.00 (0.77)	0.81–1.10 (0.88–1.07)	0.44–1.04 (0.50–0.69)
on abdomi- dorsal length nal tergite length / articular diameter of 3rd III antennal segment	15–22 (19) 0.50–0.88 (0.76)	18–29 (24) 1.17–1.67 (1.32–1.54)	13–25 (13–19) 0.53–1.43 (0.56–0.91)
margi- length nal length / articular diameter of 3rd antennal segment	18–23 (20) 0.67–1.00 (0.83)	18–28 (24) 1.17–1.83 (1.41)	15–26 (21) 0.70–1.43 (0.88–0.96)
number on abdominal tergite VI between siphunculi	2	2	2
on abdo- number	2–3 (2.1)	2	4–17 (4.0–13.0)
minal length tergite	21–35 (29)	30–48 (35–44)	38–58 (48–58)
VIII length / articular diameter of 3rd antennal segment	0.88–1.57 (1.22)	1.71–3.17 (2.01–2.56)	1.67–2.80 (1.97–2.56)
number on anterior half subgenital along the hind margin plate	2–4 (2.9) 8–14 (12.5)	– –	16–41 (17.0–35.0) 18–27 (21.0–24.0)
Length of processsus terminalis of last antennal segment / length of base of last antennal segment	1.33–1.61 (1.44)	2.13–2.90 (2.38)	1.93–2.72 (2.19–2.38)
Ultimate rostral number of accessory setae segment length	2 114–132 (121)	2 101–111 (106)	2 99–129 (105–120)
length / length of 2nd segment of hind tarsus	1.18–1.38 (1.28)	1.21–1.37 (1.24–1.33)	0.29–0.37 (0.33)
Siphunculi length	205–260 (240)	119–155 (128–154)	129–213 (156–196)
length / body length	0.11–0.12 (0.13)	0.09–0.12 (0.11)	0.09–0.13 (0.10– 0.13)
length / width of siphunculus at half length	3.85–5.06 (4.32)	3.66–5.56 (4.72)	3.19–5.33 (4.06– 4.55)
Cauda length	136–173 (160)	71–94 (77–91)	101–152 (119– 145)
number of setae	7–9 (7.8)	5–9 (6.7)	7–14 (9.5–13.5)
Length of siphunculus / length of cauda	1.40–1.58 (1.50)	1.30–1.79 (1.42– 1.70)	1.15–1.63 (1.36)