Eustigmaeus schusteri ( Summers and Price, 1961 )

Sali & Doğan, H, 2005, Eustigmaeus mites from Turkey (Acari: Stigmaeidae), Journal of Natural History 39 (11), pp. 835-861 : 842-846

Eustigmaeus schusteri ( Summers and Price, 1961)

( Figures 5 , 6 )

Ledermuelleria schusteri Summers and Price 1961, p 379 .

Ledermuelleria schusteri: Gerson 1972, p 330 .

Eustigmaeus schusteri: Tseng 1982, p 37 .

Examined materials

Sixty-seven females and one deutonymph from moss and lichen on grassy soil, Beğendik Village, Olur , Erzurum, 29 August 2001 .

Female

Length of body (excluding gnathosoma) 307–333, width 200–217.

Dorsum

Dorsal shields covered with dimples and bearing fine punctations. Dorsal dimples nearly round, of uniform diameter except smaller around eyes and bases of setae. Surface between dimples with fine punctations. The margins of the dorsal shields and anterior surface of hysterosomal shield weakly sclerotized, faintly punctated, without dimples. Fossettes on dorsal shields as illustrated, indistinct in many specimens. Propodosomal shield with four pairs of setae and one pair of eyes. Hysterosomal shield with six pairs of setae. Suranal shield tucked under body with two pairs of setae. Dorsal body setae notched, with thin hyaline sheaths and pointed tips. Postocular setae sci very short. Setae h 1 and h 2 differ from other dorsal body setae, with spinules, but without sheaths. Dimensions of setae as follows: υi 47, υe 72, sci 13, sce 47, c 1 53, c 2 38, d 1 70, d 2 53, e 1 97, e 2 80, f 1 64, h 1 47, h 2 40. Distance between setae: υi–υi 30, υe–υe 83, υi–υe 43, sci–sci 147, υe–sci 36, sce–sce 183, scisce 36, c 1 –c 1 80, d 1 –d 1 83, c 1 –d 2 60, c 1 –d 1 53, d 2 – d 2 190, d 1 – d 2 67, e 1 –e 1 103, e 2 –e 2 157, e 1 – e 2 40, d 1 –e 1 83, d 1 –e 2 64, d 2 –e 2 70, f 1 –f 1 73, e 1 –f 1 30, e 2 –f 1 73, h 1 –h 1 30, h 2 –h 2 77, h 1 –h 2 24.

Venter

Setae c 2 similar to other dorsal setae, placed on dimpled humeral shields. A pair of callosities associated with humeral shields. The callosities covered with dimples, some arranged like strung beads on central area, some arranged like pomegranate seeds. Coxisternal shields completely divided, with polygonal dimples and bearing 1a, 3a and 4a. Surface on coxae densely punctated. Aggenital shield with polygonal dimples, two pairs of setae. Pseudanal shield covered with fine punctations, three pairs of subequal setae. Suranal shield ‘‘V’’-shaped. Humeral and suranal shields with similar patterns.

Legs

Leg I 253, leg II 203, leg III 220, leg IV 240. Number of setae (solenidia in parentheses) on leg segments (I–IV) as follows: tarsi 14(v)-10(v)-8(v)-8(v), tibiae 7(w, w p)-6(w p)-6(w p)- 6(w p), genua 4(k)-4(k)-1-1, femora 6-5-3-2, trochanters 1-1-2-1, coxae 2-2-2-2. All tarsi with solenidion v. Lengths of solenidia on tarsi: v 1 27, v 2 20, v 3 10, v 4 7. Lengths of solenidia on tibiae: w 11, w p 1 20, w p 2 17, w p 3 13, w p 4 12.

Male

Not observed.

Deutonymph

Length of body (excluding gnathosoma) 250, width 170.

Dorsum

Dorsal shields covered with dimples and bearing fine punctations. Dorsal dimples as in female, but less sclerotized. Fossettes on dorsal shields indiscernible. Dorsal body setae as in female. Hysterosomal shield incompletely divided. Setae h 1 and h 2 dissimilar to other dorsal body setae, with spinules, without sheath. Dimensions of setae as follows: υi 33, υe 57, sci 10, sce 40, c 1 43, c 2 33, d 1 50, d 2 50, e 1 80, e 2 77, f 1 47, h 1 37, h 2 33. Distance between setae: υi–υi 30, υe–υe 70, υi–υe 40, sci–sci 113, υe–sci 23, sce–sce 150, sci–sce 33, c 1 – c 1 60, d 1 –d 1 50, c 1 –d 2 53, c 1 –d 1 40, d 2 – d 2 157, d 1 – d 2 57, e 1 –e 1 73, e 2 –e 2 120, e 1 – e 2 33, f 1 –f 1 50, e 1 –f 1 23, e 2 –f 1 57, h 1 –h 1 20, h 2 –h 2 56, h 1 –h 2 23.

Venter

Ventral setae and features as in female, but dimples on humeral and coxisternal shields shallower, dimples on suranal and aggenital shields indiscernible. Ventral setae 4a present, aggenital shield with two pairs of setae.

Legs

Leg I 210, leg II 170, leg III 157, leg IV 177. Number of setae (solenidia in parentheses) on leg segments (I–IV) as follows: tarsi 14(v)-10(v)-8(v)-8(v), tibiae 7(w, w p)-6(w p)-6(w p)- 6(w p), genua 4(k)-3(k)-0-0, femora 6-5-3-2, trochanters 1-1-2-0, coxae 2-2-2-2. Lengths of solenidia on tarsi: v 1 20, v 2 13, v 35 v 455.

Distribution

Canada, Taiwan and USA ( Summers and Price 1961; Gerson 1972; Tseng 1982). Remarks

This species was described and illustrated by Summers and Price (1961), and was also recorded by Gerson (1972) from Canada and Tseng (1982) from Taiwan. General features and details of leg chaetotaxy of Turkish specimens are the same as in the type species given by Summers and Price (1961). The deutonymph of this species, which is a new record for the Turkish fauna, is described for the first time.

Figures

Figure 5. Eustigmaeus schusteri (Summers and Price) (female): (A) dorsal view; (B) ventral view; (C) dorsal ornamentation; (D) lateral view; (E) dorsal setae.

Figure 6. Eustigmaeus schusteri (Summers and Price) (deutonymph): (A) dorsal view; (B) lateral view.