Woolastookia elongata ( Sokolow, 1934 )

Semenchenko, K. A., 2010, Towards The Systematics Of The Water Mite Woolastokia Elongata (Sokolow, 1934) (Acariformes: Aturidae, Acarologia 50 (4), pp. 431-437 : 432-435

Woolastookia elongata ( Sokolow, 1934)

( Figures 1 – 3 )

Axonopsis elongata Sokolow, 1934: 371 , figures 79- 81; Sokolow, 1940: 406, figures 216 a-c.

Woolastookia elongata ( Sokolow, 1934) ; Cook, 1974: 342; Semenchenko, 2006: 238.

Woolastookia spatulata Kim and Chung, 1996: 154 , figure 11. syn. nov.

Material. Russia, Primory Kray: 1 female, Khasansky District, "Kedrovaya Pad National Nature Biosphere Reserve", the Kedrovaya River , N 43°06.056’; E 131°33.310’, 25 Nov. 1993 , leg. T. M. Tiunova; 1 female, Terneysky District, the Serebryanka River, near Artemovo , N 45º06.624’; E 136º31.837’, 24 Sept. 2008, leg. K.A. Semenchenko, D.A. Sidorov ; 1 male, 2 females, Anuchinsky District, 10 km from Vinogradovka, the Arsenyevka River , N 43º48.261’; E 132º56.407’, 13 Sept. 2008, leg. K.A. Semenchenko, D.A. Sidorov ; 1 male, 2 deutonymphs, Anuchinsky District, the Arsenyevka River, near Stogovaya hill, N 43º40.315’; E 133º00.937’, 15 Sept. 2008, leg. K.A. Semenchenko, D.A. Sidorov ; Russia, Sakhalin Province: 11 males, 12 females, Dolinsky District, unnamed spring, the Izvitaya River basin, N 47º17.365’; E 143º53.069’, 27 Sept. 2008, leg. K.A. Semenchenko. Paratypes of Woolastookia spatulata – South Korea: 1 male, 1 female, spring on the Ullung Island , N 37°3’; E 130°5’, 20 Sept. 1995, leg. I.H. Kim, K.S. Chung.

Description

Deutonymph. Dorsal shield with cellular structure, occupying major portion of dorsum and situated on other shield, submerged under cuticle and having granular structure ( Figure 1 , a). Setae Oi placed on main shield, setae Oe, Hi, Sci, Li and Si on shield, submerged under cuticle. Setae Fch longer and thicker than other dorsal setae. Coxae of legs incorporated into two groups and lying on ventral shields ( Figure 1 , b). Medial portions of coxae of legs II-IV fused to each other.

Setae Ve lying free on soft integument on the level of coxae II. Setae Hv situated near medial end of suture between coxae I and II. Setae Pi without glandularia and situated anterior to anal plate, setae Pe on posterior margin of coxae IV. Anal plate tapered. Two pairs of genital acetabula lying on two genital plates, each plate with three setae.

Trochanter of pedipalp without setae ( Figure 1 , c). Pedipalpal femur without ventrodistal tuber, bearing 1 dorsomedial and 2 dorsodistal setae. Ventral margin of pedipalpal genu concave. Tibia with subequal height along segment, bearing 2 thin ventromedial setae and 1 stout distolateral spine.

Tibia of legs I with 1, tibia of legs III-IV with 2 long swimming setae ( Figure 1 , d). Claws with well developed plate and three clawlets, medial clawlet longer than interior and exterior ones. Ventral margin of claw blade slightly concave.

Measurements (n=2). Length of body 323-336, width 282-297; length of dorsal shield 252-275, width 177-194; length of pedipalpal segments (P- 1-5): 24-27, 32-35, 22-24, 54-55, 15-16; length of leg segments: I-L-1-6 - 24-26, 29-32, 29-32, 30-43, 52-54, 59-62; II-L-1-6 - 24-25, 31-32, 30-35, 40-46, 51-57, 50- 65; III-L-1-6 24-27, 30-35, 35-40, 43-54, 56-70, 62-67; IV-L-1-6 - 36-38, 42-43, 42-43, 52-55, 63-65, 65-67.

Male. Body elongated ( Figure 2 , a). Its posterior margin with small depression. Dorsal shield with eight pairs of setae: Fp, Vi, Oi, Oe, Hi, Sci, Li and Si. Setae Se placed on elongated sclerits, situated laterally of posterior part of dorsal shield. First pair of lyriform organs (i 1) placed on dorsal shield, three pairs of lyriform organs (i 2 -i 4) lying free on soft integument along lateral edges of dorsal shield, i 5 on small platelets behind genital field. Medial portions of coxae of legs II-IV fused to each other ( Figure 2 , b). Longitudinal crest located between place of insertion of leg IV and genital field. Genital field with 3 pairs of acetabula. Margins of genital opening with great number of short setae.

Trochanter of pedipalp long, curved medially, with single dorsomedial seta ( Figure 2 , c). Pedipalpal femur with straight ventral and convex dorsal margin, bearing 5 setae. Genu with 1 short dorsomedial seta and 2 long dorsodistal setae. Tibia long with subequal height along segment, bearing

Acarologia 50(4): 431–437 (2010)

2 thin long ventromedial setae and 1 stout distolateral spine.

Tibia of legs II with 3 swimming setae. Legs III longer than other pairs of leg, their tibia with 4 swimming setae ( Figure 2 , d). Legs IV thickened, bearing 3 swimming setae on tibia and plenty of stout setae on tarsus ( Figure 2 , e-f). Claws of legs I-III with 3 clawlets, medial clawlet longer than interior and exterior ones. Claws of legs IV larger than that of other pairs of legs, strongly curved, with 1 short interior and 1 long exterior clawlets.

Measurements (n=3). Length of body 488-521, width 363-396; length of dorsal shield 485-515, width 303-336; length of pedipalpal segments (P-1- 5): 35-36, 46-48, 29-32, 78-81, 24-26; length of leg segments: I-L-1-6 - 35-40, 38-40, 54-57, 73-75, 86-92, 92- 94; II-L-1-6 - 40-43, 50-54, 57-62, 76-81, 94-96, 92-94; III-L-1-6 40-43, 70-78, 73-76, 94-95, 113-121, 110-113; IV-L-1-6 - 54-67, 58-60, 73-77, 86-94, 108-116, 97-99.

Female. Position of setae on dorsal shield similar to that of male ( Figure 3 , a). Anal opening situated behind dorsal shield. Structure of legs coxae similar to that of male ( Figure 3 , b). In contrast to male no longitudinal crest located between place of insertion of leg IV and genital field. Genital plates triangular, each with 3 acetabula, occupying about half of its surface, and 4-5 short thin setae. Leg IV unmodified, bearing claws with 3 clawlets.

Measurements (n=3). Length of body 548-587, width 396-422; length of dorsal shield 554-568, width 343-363; length of pedipalpal segments (P- 1-5): 35-40, 50-54, 31-33, 81-83, 24-25; length of leg segments: I-L-1-6 - 37-40, 43-51, 34-49, 70-73, 78-84, 78-81; II-L-1-6 - 43-45, 43-57, 51-54, 67-76, 86-87, 83- 86; III-L-1-6 43-47, 62-73, 67-70, 83-86, 100-108, 84- 94; IV-L-1-6 - 67-70, 68-72, 67-70, 84-86, 97-99, 92-94.

Figures

FIGURE 1: Woolastookia elongata (Sokolow, 1934), deutonymph: a – idiosoma, dorsal view, b – idiosoma, ventral view, c – pedipalp, d – leg IV. Scale bars = 50 µm for figures a-b; 25 µm for figures c-d.

FIGURE 2: Woolastookia elongata (Sokolow, 1934), male: a – idiosoma, dorsal view, b – idiosoma, ventral view, c – pedipalp, d – tibia and tarsus of leg III, e – leg IV, f – tibia and tarsus of leg IV. Scale bars = 100 µm for figures a-b; 25 µm for figures c-f.

FIGURE 3: Woolastookia elongata (Sokolow, 1934), female: a – idiosoma, dorsal view, b – idiosoma, ventral view. Scale bar = 100 µm.