Mesocallis (Mesocallis) pteleae Matsumura, 1919

Lee, Yerim, Kanturski, Mariusz & Lee, Seunghwan, 2018, Psammoecus simonis Grouvelle 1892, Zoological Studies 57 (17), pp. 1-20 : 4-7

Mesocallis (Mesocallis) pteleae Matsumura, 1919

( Figs. 1 , 2 , 3 c-d, 6; Table 1)

Mesocallis pteleae Matsumura, 1919: 103 .

Agrioaphis corylicola Shinji, 1935: 1148 .

Agrioaphis hashibamii Shinji, 1935: 287 .

Material examined: 3 alate viviparous females, Mt. Beagunsan, Gwangyang-si, JN, South Korea, 35°06'26"N, 127°37'19"E, on Carpinus sp. , Yerim Lee leg., 25.vii.2013, no. 130725YR-23, including DNA voucher no. Ca2; 33 alate viviparous females, Mt. Chilgapsan, Cheongyang-gun, CN, South Korea, 36°24'48"N, 126°53'03"E, on Corylus sp. , Yerim Lee and Hyoseok Lee leg., 10.v.2014, no. 140510YR-1, including DNA voucher no. Co10-1, Co10-2, Co10-3, Co10-4, Co20; 2 alate viviparous females, Mt. Chilgapsan, Cheongyang-gun, CN, South Korea, 36°24'48"N, 126°53'03"E, on Corylus sp. , Yerim Lee and Hyoseok Lee leg., 6.v.2016, no. 160506YR-2.

Diagnosis: This species is similar to M. (M.) taoi Quednau by the color of ANT and black pigmented frons. However, it can be distinguished by its longer ANT III length, 0.33-0.43 mm (0.14- 0.20 mm in M. taoi ) and long and slender URS, 0.11-0.14 mm (0.06-0.07 mm in M. taoi ).

Redescription (Alate viviparous female): Color in life: Head pale, head vertex and ANT I-III fuscous, compound eye red, distal joint of ANT IV- V, BASE and distal 1/2 of PT also dark. Thorax and abdomen pale. Legs pale, fore tibiae including 1/9 of femur black, distal margin of FEMUR III dark, tarsus dark. Wing vein Cu1b of forewing dark bordered. SIPH and cauda pale.

Morphology: Body oval, BL 1.51-1.76 mm long. Head smooth with a flat median protrusion on frons, head vertex with 0.01 mm pointed setae, epicranial suture developed, head dorsum without tubercles. ANT 6-segmented, ANT 0.63- 0.74 × BL, ANT III longest with 13-16 transversely elliptical secondary rhinaria in a row on the whole segment, ANT III with 8-10 short pointed setae, ANT III-VI imbricated, ANT IV without secondary rhinaria, ANT V shorter than ANT IV, BASE with a single inconspicuous seta, PT 0.71-0.91 × BASE. Rostrum not reaching to middle coxae, URS 0.11- 0.14 mm long with 8-9 accessory setae, URS 0.86- 1.27 × BASE, 1.22-1.50 × HT II. Thorax smooth, without tubercles. Fore coxae weakly enlarged, longest setae on TIBIAE III 1.00-1.05 × middle width of TIBIAE III, HT I with 7 chaetotaxy, HT II 0.08-0.10 mm long. Wing vein Rs of forewing weakly developed. Dorsal spinal setae sometimes on small elevations, conspicuous tubercles not developed, ABD VIII with a pair of spinal setae,

rarely with 3 setae, ABD margin I-IV with a single seta on short cone-shaped tubercles, 4th marginal tubercle 0.02 mm long. SIPH cylindrical, truncated, 0.03-0.06 mm long. Cauda knobbed, 0.09-0.11 mm long, bearing 8-11 setae. Anal plate bilobed, each lobe with 7-10 setae.

Distribution: The species is known from Chungcheongnam-do in western Korea. (First record), China ( Zhang and Zhong 1990), Japan ( Higuchi 1972)

Host plant: This species feeds on Alnus spp. , Betula spp. , Carpinus spp. , Ostrya spp. ( Holman 2009). In Korea, it was only found on Corylus spp. ( Betulaceae ). Matsumura (1919) gave Ptelea trifoliata ( Rutaceae ) as a host plant, however, it is unlikely to be a true host.

Figures

Fig. 1. Collection sites of Mesocallis spp. specimens collected in this study (●) and museum specimens (♦).

Fig. 2. A pictorial key to the species of Mesocallis in the Korean peninsula. © 2018 Academia Sinica, Taiwan

Fig. 3. Representatives of Mesocallis (Mesocallis) of Korea in life: (a) alate viviparous female of M. (M.) carpinicola sp. nov.; (b) alatoid nymph of M. (M.) carpinicola sp. nov.; (c) alate viviparous female of M. (M.) pteleae; (d) alatoid nymph of M. (M.) pteleae; (e) alate viviparous female of M. (M.) sawashibae; (f) alatoid nymph of M. (M.) sawashibae.