Aculus mastigophorus ( Nalepa, 1890 )

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 : 294-298

Aculus mastigophorus ( Nalepa, 1890)

Phyllocoptes mastigophorus Nalepa, 1890 pp. 60 , 67 no.44; Nalepa, 1894 pp. 308–309 pl. 3,

f. 1–2 (Additional description); Liro & Roivainen, 1951 p. 189.

Vasates mastigophorus: Roivainen, 1950 p. 25 .

Aculus mastigophorus: Amrine & Stasny, 1994 p. 136 .

( Figs. 14 , 15 , Table 3)

Female (n=2) — Body fusiform, 153 (144-163), 62 (n=1) wide, 62 (n=1) thick.

Gnathosoma 22 (n=1), projecting obliquely downwards; chelicerae 14 (n=1).

Prodorsal shield semioval, 42 (34-45) (including frontal lobe), 52 (n=1) wide; frontal lobe

4-5, obtuse triangular with a blunt tip, with a median line complete, a little obscure, admedian lines complete, divergent to rear, 3 submedian lines in the lateral area of prodorsal shield; scapular tubercles 36 (n=1) apart, ahead of rear shield margin; scapular setae sc 84 (80-87), too long, directing forward.

Leg I 43 (n=1), femur 16 (n=1), femoral setae bv 4 (n=1) on anterior 1/2 from the base of femur; genu 4 (n=1), genual setae l ″ 10 (n=1); tibia 6 (n=1), paraxial tibial setae l ′ 4 (n=1)

on anterior 1/2 from the base of tibia ( Fig.15D ); tarsus 10 (n=1), tarsal solenidion ω 7 (n=1),

slightly curved with knob apically, tarsal empodium em 5 (n=1), simple 2–rayed.

Leg II 33 (n=1), femur 11 (11-12), femoral setae bv 4 (n=1) on anterior 1/2 from the base of femur; genu 4 (4-5), genual setae l ″ 6 (4–7), tibia 5 (5-5); tarsus 7 (7-8), tarsal solenidion ω

5 (4-6), curved with knob apically, tarsal empodium em 5 (4-5), simple, 2–rayed.

Coxisternal plates smooth; prosternal apodeme contact at one point. Anterior setae on coxisternum I 1b 4 (n=1), 14 (n=1) apart, ahead of line through proximal setae 1a on coxisternum I; 1a 4 (n=1), 17 (n=1) apart, a little ahead of line through proximal setae 2a of coxisternum II, proximal seta 2a 18 (n=1), 22 (n=1) apart.

External genitalia 17 (n=1), 26 (n=1) wide, flat bowl-shaped; coverflap smooth; setae 3a

7 (n=1), 18 (n=1) apart. Coxigenital region with 4-5 semiannuli, microtubercles.

Opisthosoma with 39–42 dorsal, 60-60 ventral annuli. Dorsal annuli smooth, ventral annuli microtuberculate. Opisthosomal setae c2 11 (9-13), 57 (n=1) apart on 9–13th annulus; d

23 (n=1), 34 (n=1) apart on 22–24th annulus; e 11 (7-16), 20 (n=1) apart on 38-38th annulus; f

20 (19-20), 25 (n=1) apart on 6-6th annulus from rear; h1 4 (3-5), 9 (9-9) apart and h2 71 (n=1),

15 (n=1) apart.

Male — Not found.

Specimens examined — 2 females on 2 microscopic slides of inventory nos. NHMW29909/1-

2 from vial no. 355 in Box TU from the Nalepa mite collection deposited in the NHMW.

Host plant — Ulmus campestris L.

Type locality — Not listed. Austria? (Nalepa Collection Locality. Unknown).

Distribution — Sweden ( Roivainen, 1950).

Remarks — This species had very characteristic long scapular setae on the prodorsal shield. No seta was found on the tibial segment of the leg I of this mite ( Nalepa, 1894) and if it was really absent, Amrine and Stasny (1994) suggested that a new genus might be created. However, our examination of the Nalepa specimen revealed that the mite apparently had a seta on the tibial segment of the leg I (arrow in Fig. 15D ), so that it was not necessary to create a new genus.

Figures

Figure 14 Drawing ofAculus mastigophorus (Nalepa, 1890) (female). A – dorsal view of body; B – ventral view of body; C – empodium; D – internal genitalia of female.

Figure 15 Phase-contrast light microscope images of Aculus mastigophorus. A – dorsal view of body; B – dorsal view of prodorsal shield; C – coxigenital region of female; D – legs (arrow: tibial seta on leg I).