Macrosiphum eastopi Barjadze & Blackman, 2017

Barjadze, Shalva, Barbagallo, Sebastiano, Blackman, Roger & Özdemir, Işil, 2017, A new Caryophyllaceae-feeding species of Macrosiphum (Hemiptera: Aphididae) in Republic of Georgia, and a redescription of Macrosiphum hartigi Hille Ris Lambers, Zootaxa 4341 (2) : 231-234

Macrosiphum eastopi Barjadze & Blackman sp. n.

Figs 1–13 and 19 , Table 1

Type material. Holotype: 1 apt., coll. no. GEZAG 20110730–01 , deposited at IZISU, GEORGIA, Samegrelo– Zemo Svaneti region , Mestia district, Zagaro Pass, N 42°54', E 43°6', 2620 m a.s.l., 30.vii.2011, on Oberna multifida Ikonn. , leg. Sh. Barjadze ; Paratypes: 7 apt. and 2 al. on 9 slides, coll. no. GEZAG 20110730–02–10; 8 apt. on 2 slides, coll. no. GEZAG 19570817–01–08, locality and host plant same as for holotype; 17.viii.1957, leg. A. Dzhibladze; 4 m. on 4 slides, coll. no. GEZAG 19570817–09–12 , the same data as paratype females sampled on 17.viii.1957 .

Deposition of type material: holotype and paratypes GEZAG 20110730–05, 0 7, 0 8, 10, GEZAG 19570817– 05–08 and GEZAG 19570817–09–12 are deposited at IZISU; paratypes GEZAG 20110730–02, 0 9 and GEZAG 19570817–01–04 are deposited at BMNH; paratypes GEZAG 20110730–03, 0 4, 0 6 are deposited at UCI.

Etymology. The specific name is given in honour of Dr. Victor Eastop, who worked on aphid taxonomy for more than 60 years.

Description. Apterous viviparous female (n=16)

Appearance in life: body pale green with pale green cauda; SIPH pale green with black apices; femora and tibiae yellowish with brown or black apices; tarsi brown or black. Appearance on slide: ANT I and II pale; ANT III either entirely pale except for dark apex, or only basal unsensoriated part of ANT III is pale, while sensoriated part of ANT III dusky or dark; ANT IV–V pale with dark apex or wholly dusky or dark; ANT VI wholly dusky or dark ( Figs 1, 3, 5 ); head, thorax and abdomen pale; abdomen without any dark sclerotisation ( Figs 2–4 ); URS dark ( Fig. 7 ); apices of femora and tibiae dark ( Figs 2, 4 ); tarsi brown ( Fig. 6 ); SIPH mainly pale with dark apex or gradually darker on the distal half; cauda pale ( Fig. 4 ).

Slide–mounted specimens: body oval or spindle–shaped ( Figs 2, 4 ), medium sized, BW 0.51–0.57× BL. ANT 6–segmented, ANT tubercles well developed ( Figs 2–3 ). ANT setae pointed ( Fig. 5 ). Sec. rhin. present on one side of ANT III over most of its length, numbering 13–33 all of similar size, almost in a single row ( Fig. 5 ). Cephalic setae pointed. Cuticle of head capsule and ANT I usually smooth, except for a few very small spicules occasionally present on ventral side lateral to mouthparts. Rostrum short, reaching to or just passing middle coxae ( Fig. 2 ). URS oblong triangular with blunt apex ( Fig. 7 ). HFEM with small spiculated cuticular imbrications on distal one–third to half of length. Small MTu often present on ABD TERG II–IV. ABD TERG VIII with 0–1 STu. SIPH cylindrical, with enlarged base and small flange ( Fig. 4 ); smooth, except for apical reticulated area covering 0.11–0.21 part of length of SIPH and slightly constricted. SIPH length 7.52–12.50× its middle diameter. Subgenital plate broadly oval and sclerotized ( Fig. 8 ). Cauda elongate triangular and slightly constricted at basal 1/3 ( Fig. 4 ).

A late viviparous female (n=2)

Appearance in life: unknown. Appearance on slide: ANT I–VI segments brown, except for basal unsensoriated part of ANT III, which is paler ( Figs 9, 11, 13 ); head and thorax brown ( Figs 10–11 ); rostrum pale except for segments III –V, which are pale brown; coxa and trochanter pale; femora and tibiae pale except for brown apices; tarsus brown; tergum of abdomen anterior of SIPH pale with small brown marginal sclerites on ABD TERG I–V and with dusky bands on ABD TERG VII – VIII; basal half of SIPH pale, while apical half dusky; subgenital and anal plates dusky; cauda pale ( Figs 10, 12 ).

Slide–mounted specimens: body spindle–shaped ( Fig. 10 ), medium sized, BW 0.52–0.55× BL. ANT 6– segmented, ANT tubercles well developed ( Fig. 11 ). Sec. rhin. present on one side of ANT III over most of its length, numbering 36–43 all of similar size, almost in a single row ( Fig. 9 ). Cuticle of head capsule and ANT I usually smooth, except for a few very small spicules occasionally present on ventral side lateral to mouthparts. Rostrum short, reaching to middle coxae. HFEM with small spiculated cuticular imbrications on distal half to twothirds of length. Small MTu present on ABD TERG II–IV. ABD TERG VII–VIII with 2, and 1 or 2 STu respectively. SIPH with apical reticulated area covering 0.16–0.19 part of the length of SIPH and distinctly constricted. SIPH length 9.97–12.65× its middle diameter. Other characters as in apterous viviparous female.

Alate male (n=4)

Appearance in life: unknown. Appearance on slide: ANT brown except for basal part of ANT III, which is slightly pale; head, rostrum, thorax and SIPH brown; femora and tibiae pale except for brown apices; tarsus brown; ABD TERG I–VII with dark brown marginal areas, ante– and postsiphuncular sclerites developed; ABD TERG I– VII with spinal and pleural or spinopleural bars; ABD TERG VIII with transverse bands; cauda dusky ( Fig. 19 ).

Slide–mounted specimens: body spindle–shaped ( Fig. 19 ), medium–sized, BW 0.37–0.43× BL. ANT 6– segmented, ANT tubercles well developed. Number of sec. rhin. on ANT III: 58–75, on ANT IV: 0–5, and on ANT V: 12–19. Cuticle of head capsule and ANT I usually smooth. Rostrum short, reaching to middle coxae. HFEM with small spiculated cuticular imbrications on distal one–third to half of length. MTu present on ABD TERG I–V, their number varying between 4 and 8. ABD TERG VII with 0–2 STu. SIPH with apical reticulated area covering 0.20–0.35 part of the length of SIPH and constricted. SIPH length 7.23–10.51× its middle diameter. Other characters as in apterous viviparous female.

Measurements, ratios and chaetotaxy for the above–described morphs are given in Table 1 .

Biology. Macrosiphum eastopi sp. n. is monoecious and holocyclic, with alate males collected in August. Apterae of this species live in sparse colonies on the undersides of leaves and stems of Oberna multifida .

Distribution. Only known from the type locality in Zagaro Pass–southern slope of the Greater Caucasus Mountain Range, Mestia district, Samegrelo–Zemo Svaneti Region, Western Georgia.

......continued on the next page

Figures

FIGURES 1 – 8. Macrosiphum eastopi Barjadze & Blackman sp. n. apterous viviparous female. 1. ANT IV – VI (bar: 300 µm); 2. Anterior part of body (bar: 200 µm); 3. Head with ANT I – II (bar: 200 µm); 4. Posterior part of abdomen with SIPH and cauda (bar: 200 µm); 5. ANT II – III (bar: 200 µm); 6. HT II (bar: 50 µm); 7. URS (bar: 50 µm); 8. Subgenital plate (bar: 200 µm).

FIGURES 9 – 13. Macrosiphum eastopi Barjadze & Blackman sp. n. alate viviparous female. 9. ANT III (bar: 200 µm); 10. Habitus (bar: 200 µm); 11. Head with ANT I – II (bar: 200 µm); 12. Posterior part of abdomen with SIPH and cauda (bar: 200 µm); 13. ANT IV – VI (bar: 500 µm).

FIGURES 14 – 19. Habitus of different morphs of Macrosiphum hartigi Hille Ris Lambers, 1947 and Macrosiphum eastopi Barjadze & Blackman sp. n. Macrosiphum hartigi. Fundatrix (bar: 1 mm); 15. Apterous viviparous female from co-type series (bar: 1 mm); 16. Oviparous female (bar: 1 mm); 17. Alate viviparous female (bar: 1 mm); 18. alate male (bar: 1 mm); Macrosiphum eastopi sp. n. 19. alate male (bar: 500 µm).

Tables

TABLE 1. Measurements, ratios and chaetotaxy of Macrosiphum eastopi Barjadze & Blackman sp. n. (measurements are given in mm).

Morphs	apt. (n=16)	al. (n=2)	m. (n=4)
Measurements:
ANT	2.864–3.539	3.698–3.776	3.327–3.495
ANT I	0.117–0.164	0.122–0.125	0.097–0.101
ANT II	0.084–0.115	0.081	0.066–0.083
ANT III BD	0.040–0.063	0.042–0.043	0.036–0.056
ANT III	0.835–1.055	1.076–1.093	0.860–0.936
Longest seta on ANT III	0.033–0.045	0.029–0.036	0.026–0.031
ANT IV	0.489–0.695	0.685–0.724	0.655–0.754
ANT V	0.452–0.640	0.621–0.654	0.549–0.588
ANT VI b	0.156–0.200	0.184–0.187	0.121–0.169
PT	0.720–0.886	0.906–0.935	0.899–0.919
BL	2.888–3.675	2.577–2.673	2.145–2.526
BW	1.581–1.915	0.947–1.014	0.912–0.956
Longest dorsal cephalic seta	0.053–0.079	0.047–0.050	0.046–0.061
URS L	0.124–0.163	0.146–0.155	0.143–0.149
URS W	0.057–0.125	–	0.063
Posterior seta on hind trochanter	0.050–0.066	0.050–0.051	0.033–0.050
HFEM	1.110–1.370	1.255–1.285	1.009–1.084
HTIB	1.800–2.350	2.226–2.327	1.816–2.022
HT II L	0.184–0.223	0.206	0.171–0.195
HT II W	0.029–0.039	0.027	–
Longest setae on ABD TERG III	0.023–0.038	0.033–0.035	0.038–0.044
SIPH	0.621–0.876	0.696–0.718	0.376–0.490