Aceria thomasi ( Nalepa, 1889 )

Kadono, Fujio, Takei, Madoka, Gotoh, Tetsuo, Kubota, Kenji, Hörweg, Christoph & Kagiwada, Satoshi, 2022, Supplementary descriptions of seven eriophyoid mite species (Acari: Eriophyoidea) recovered from the Viennese Nalepa collection and comparison with Japanese species, Acarologia 62 (2), pp. 273-301 : 275-278

Aceria thomasi ( Nalepa, 1889)

Phytoptus thomasi Nalepa,1889 pp. 135-137 t. 6 f. 1-3.

of telosoma; D – prodorsal shield; E – coxigenital region of female; F – empodium; G – internal genitalia of female.

Phytoptus thomasi: Canestrini,1892 pp. 618-619 t. 49 f. 1; t. 44 f. 8; Cotte,1924 pp. 14-17 pl.

4, f. 19.

Eriophyes thomasi: Liro & Roivainen, 1951 pp. 138-139 .

Aceria thomasi: Farkas, 1965 p. 47 fig. 34D; Boczek & Chyczewski, 1978 p. 112 ; Hellrigl,

2003 p. 100; Amrine & Stasny, 1994 p. 91 ; Szydło et al., 2010 pp. 144-148 figs. 4-6, 12B, Table 1.

( Figs. 2 , 3 , Table 1)

Female (n=10) — Body fusiform, 249 (181-292), 68 (62-74) wide, 65 (61-74) thick.

Gnathosoma 23 (19-26), projecting obliquely downwards; chelicerae 20 (16-27), bent down.

Prodorsal shield semicircular in dorsal view, 36 (31-38), 46 (34-55) wide, with a median line complete, broken at anterior 1/3 of prodorsal shield, admedian lines complete, divergent to rear, first submedian lines on anterior 2/3 of prodorsal shield, curving outwards, second submedian lines on anterior 1/2 of prodorsal shield, curving outwards, joining first submedian lines posteriorly, short lines and dots present in lateral area of prodorsal shield; scapular tubercles, 30 (27-32) apart on rear shield margin; scapular setae sc 32 (23-43, n=8), diverging backward.

Leg I 44 (38-48), femur 13 (7-15), femoral setae bv 5 (4–7, n=8) on 1/2 anterior from the base of femur; genu 7 (6-8), genual setae l ″ 15 (10–24, n=7); tibia 9 (8-10), paraxial tibial setae

l ′ 4 (2–6, n=9) on 1/2 anterior from the base of tibia; tarsus 10 (9-11), tarsal solenidion ω 9

(6-10), slightly curved with knob apically, tarsal empodium em 7 (5-9), simple 4–5–rayed.

Leg II 37 (33-42), femur 10 (8-12), femoral setae bv 5 (4–5, n=8) on 1/2 anterior from the base of femur; genu 6 (5-8), genual setae l ″ 6 (4–8, n=9); tibia 7 (5-8); tarsus 9 (7-11), tarsal solenidion ω 8 (6-11), slightly curved with knob apically, tarsal empodium em 6 (4-8), simple 4–5–rayed.

Coxisternal plates with some short lines; prosternal apodeme entire, distinct. Anterior setae on coxisternum I 1b 5 (4-6, n=5), 17 (11-21) apart, ahead of transverse line through proximal setae 1a on coxisternum I, 1a 13 (10-16, n=5), 12 (9-13) apart, ahead of transverse line through proximal setae 2a on coxisternum II, proximal setae 2a 22 (18-27, n=5), 32 (28-33)

apart.

External genitalia 19 (17-22), 31 (29-33) wide; coverflap subtriangular, with 10–12 longitudinal striae; setae 3a 13 (8-16, n=8), 25 (23-29) apart. Coxigenital region with 7-10 semiannuli, microtuberculate.

Opisthosoma with subequal annuli dorsoventrally: 83–94 dorsal annuli with semiellipsoidal microtubercles on the margin, 78–90 ventral annuli with hemispherical microtubercles on the margin; opisthosomal setae c2 13 (10-20, n=8), 68 (55-77) apart on 12–15th annulus;

d 26 (17-35, n=9), 56 (43-64) apart on 29–34th annulus; e 16 (10-22, n=10), 31 (27-34) apart on 47–55th annulus; f 18 (12-24, n=10), 28 (23-32) apart on 7–9th annulus from rear; h1 6

(5-7, n=9), 9 (8-10) apart and h2 49 (35-56, n=4), 13 (12-16) apart.

Male — Not found.

Specimens examined — Ten females on 10 microscopic slides of inventory nos. NHMW29901/1-14 from vial no. 340 and NHMW29902/1 from vial no. 341 in Box TU from the Nalepa mite collection deposited in the NHMW.

Host plant — Thymus serpyllum L.

Other host plants — Thymus pannonicus All. (= T. pulegioides subsp. pannonicus (All.) Kerguélen ) ( Boža, 1983 ; Petanović & Stanković, 1999), Thymus praecox Opiz ( Szydło et al., 2010), Origanum vulgare L. ( Amrine & Stasny,1994) ( Lamiaceae )

Type locality — Austria? (Nalepa Collection Locality. Unknown).

Distribution — Austria ( Hellrigl, 2003), Finland ( Liro & Roivainen, 1951), Germany ( Hellrigl, 2003), Iceland ( Szydło et al., 2010), Italy ( Canestrini, 1892 ; Hellrigl, 2003), Montenegro ( Jočić & Petanović, 2012), Poland ( Boczek & Chyczewski, 1978 ; Skoracka et al., 2005), Serbia ( Boža, 1983 ; Petanović & Stanković, 1999).

Relation to host —According to Nalepa (1889), the mite causes white erineum on blister with a diameter of 5-8 mm on leaves and flowers of Thymus serpyllum .

Remarks — The range of body length and width Aceria of thomasi ( Nalepa, 1889) (original data) almost overlapped with both that of the topotype specimens (present data) and that of specimens collected from Iceland ( Szydło et al., 2010). The measurements of all taxonomic characters except setae were not almost different between that of topotype specimens (present data) and that of specimens from Iceland ( Szydło et al., 2010), but the lengths of most setae measurements of topotype specimens were relatively a little shorter than that of specimens from Iceland ( Table 1).

Figures

Figure 2 Drawing ofAceria thomasi (Nalepa, 1889) (female). A – antero-lateral view of body; B – lateral view of abdomen; C – lateral view

Figure 3 Phase-contrast light microscope images of Aceria thomasi. A – lateral view of body; B – dorsal view of prodorsal shield; C – coxigenital region of female.