Atractides (Atractides) schwoerbeli Lundblad, 1969

Pesic, Vladimir & Smit, Harry, 2009, New records of water mites of the genus Atractides Koch, 1837 (Acari: Hydrachnidia, Hygrobatidae) from Thailand, Malaysia and Sulawesi (Indonesia), with the description of four new species, Zootaxa 2240, pp. 1-30 : 14-19

publication ID	https://doi.org/ 10.5281/zenodo.190536
DOI	https://doi.org/10.5281/zenodo.6216156
persistent identifier	https://treatment.plazi.org/id/03DD801A-E558-FFB3-FF43-D3A1FB11F95B
treatment provided by	Plazi
scientific name	Atractides (Atractides) schwoerbeli Lundblad, 1969
status

Treatment

( Figs. 9A–D View FIGURE 9 A – D , 10A–B View FIGURE 10 A – B , 11A–B View FIGURE 11 A – B , 12A–D View FIGURE 12 A – D , 13A–C View FIGURE 13 A – C )

Material. THAILAND: stream W of Bankrang Camp, Kaeng Krachan NP, 30.xi.2007, 12° 48.106 N 99° 26.786 E, leg. Smit, 2/ 3juveniles /0 (2/1/0 mounted); River at km. 13, alt. 465 m, Doi Inthanon NP, 25.xi.2007, no GPS-coordinates, leg. Smit, 2/5/0 (1/1/0 mounted); stream downstream of Siriphum Waterfall, Doi Inthanon NP, alt. 1300 m, 26.xi.2007, no GPS-coordinates, leg. Smit, 0/2/0 (0/1/0 mounted); stream downstream of Huoay Meng waterfall, between Chiang Saen And Chiang Khong, 20.xi.2007, 20° 18.095 N 100° 22.454 E, leg. Smit, 3/7/0 (1/1/0 mounted). MALAYSIA: Jerian stream, Fraser’s Hill, 14.ii.2009, 3° 43.479 N 101° 42.935 E, alt. 1011 m, leg. Smit, 1/4/0 (1/1/0 mounted); Jerian stream, Fraser’s Hill, 16.ii.2009, 3° 43.475 N 101° 42.935 E, alt. 1011m, leg. Smit, 3/0/0 (1/0/0 mounted).

Morphology. General features. Integument dorsally striated. Muscle attachment plates unsclerotized. Genital field: Ac in triangular arrangement; excretory pore smooth; Vgl-1 separated from Vgl-2. Palp: weak sexual dimorphism; P-2 ventral margin straight, sword seta of P-4 between ventral hair insertions. I-Leg: I- Leg-5 thickened, setae S-1 and -2 distanced, S-1 slender, slightly curved, S-2 enlarged, both with blunt tips; I- Leg-6 curved, thickened basally.

Male (from stream W of Bankrang Camp, Thailand, n=2; in parentheses specimen from stream downstream of Huoay Meng waterfall, Thailand; in square brackets specimens from River at km. 13, Thailand). Idiosoma L/W 409-419 (459) [438]/303-319 (344). Coxal field ( Fig. 9A View FIGURE 9 A – D ): L 256 (284) [291], Cx- 1+2 mL 103-106 (122), Cx-3 W 284-288 (319) [306], Cx-1+2 lL 175-178 (197) [197]. Palp ( Fig. 9C View FIGURE 9 A – D ): total L 213-219 (231) [248], dL: P- 1 23-24 (23) [26], P-2 46-47 (49) [53], P-3 52-55 (59) [61], P-4 65-68 (74) [78], P-5 26 (26) [30]; %L: P-1 10.8-11.0 (10.0) [10.5], P-2 21.0-22.1 (21.2) [21.4], P-3 24.4-25.1 (25.5) [24.6], P- 4 30.5-31.1 (32.0) [31.5], P-5 11.9-12.2 (11.3) [12.1]; L P-2/P-4 0.72 (0.81) [0.72]. Genital field ( Fig. 9B View FIGURE 9 A – D ): anterior margin equally convex, posterior margin indented, L/W 77 (91) [96]/85-89 (96) [94], L Ac-1-3: 27-28 (33) [32]: 29-30 (32) [33]: 30-36 (37) [36].

I-Leg ( Fig. 9D View FIGURE 9 A – D ): I-Leg-5 dL 130-133 (147) [152], vL 86-92 (98) [], dL/vL 1.45-1.51 (1.5) [], HB 42-44 (46) [49], dL/HB 3.0-3.1 (3.2) [3.1], S-1 L 74 (81) [83], L/ W 9.9 -10.8 (10.7) [10.4], S-2 L 64 (65) [67], L/ W 5.3 (5.4) [5.6], distance of sword setae at I-Leg-5 16 (19) [18], L S-1/2 1.16 (1.25) [1.24]; I-Leg-6 L 99-100 (111) [117], HB 16-18 (17) [18], L/HB 5.4-6.3 (6.6) [6.5]; L I-Leg-5/6 1.3-1.33 (1.32) [1.3].

Female (from stream downstream of Huoay Meng, Thailand; in parentheses juvenile specimen from stream W of Bankrang Camp, Thailand; in square brackets specimens from River at km. 13, Thailand). Idiosoma L/W 663 (394) [813]/488 (297) [644]. Coxal field ( Fig. 10A View FIGURE 10 A – B ): L (294) [383], Cx-3 W (316) [484], Cx-1+2 mL 135 (125) [144], Cx-1+2 lL 219 (209) [259]. Palp ( Fig. 10B View FIGURE 10 A – B ): total L 313 (292) [342], dL: P-1 28 (27) [30], P-2 64 (59) [70], P-3 91 (80) [95], P-4 97 (92) [109], P-5 33 (34) [38]; %L: P-1 9.0 (9.3) [8.8], P-2 20.5 (20.2) [20.5], P-3 29.1 (27.4) [27.8], P-4 31.0 (31.5) [31.9], P-5 10.5 (11.6) [11.1]; L P-2/P-4 0.66 (0.64) [0.64]; ventral margin P-3 and -4 straight. Genital field (Fig.): L [156], W 147 () [171], genital plate L 115 (101) [122], L Ac-1-3: 39 (38) [44]-42 (38) [46]-45 (38) [46].

I-Leg ( Fig. 11 View FIGURE 11 A – B A-B): I-Leg-5 dL 206 (191) [216], vL 136 (123) [144], dL/vL 1.52 (1.55), [1.5], HB 62 (62) [65], dL/HB 3.3 (3.1) [3.3], S-1 L 112 (105) [121], L/ W 10.6 (10.5) [11.4], S-2 L 85 (81) [94], L/ W 5.2 (5.6) [5.6], distance of sword setae at I-Leg-5 29 (29) [33], L S-1/2 1.3 (1.3) [1.3]; I-Leg-6 L 147 (137) [168], HB 17 (16) [20], L/HB 8.5 (8.6) [8.5]; L I-Leg-5/6 1.4 (1.39) [1.29].

In addition we give measurements of the females from Jerian stream, Malaysia which are suspected to belong to the same species (general differences see below in the “remarks”-section).

Male (n=2). Idiosoma L/W 380-413/297-322; glandularia maximum diameter 25. Coxal field (Fig. A2A): L 248-281, Cx-3 W 279-313, Cx-1+2 mL 114-127, Cx-1+2 lL 174-194. Palp ( Fig. 12C View FIGURE 12 A – D ): total L 222 (217), dL: P-1 24 (23), P-2 44 (47), P-3 56 (55), P-4 72 (68), P-5 26 (24); %L: P-1 10.8 (10.6), P-2 19.8 (21.7), P-3 25.2 (25.3), P-4 32.4 (31.3), P-5 11.7 (11.1); L P-2/P-4 0.61 (0.69). Genital field ( Fig. 12B View FIGURE 12 A – D ): L/W 78-80/ 79- 88, L Ac-1-3: 24-30: 24-32: 29-33.

I-Leg ( Fig. 12D View FIGURE 12 A – D ): I-Leg-5 dL 142-152, vL 81-89, dL/vL 1.7-1.76, HB 46-47, dL/HB 3.1-3.2, S-1 L 91-97, L/ W 10.7 -12.0, S-2 L 68-69, L/ W 5.3 -5.7, distance of sword setae at I-Leg- 5 24-28, L S-1/2 1.3-1.43; I-Leg-6 L 121-124, HB 16, L/HB 7.6-7.7; L I-Leg-5/6 1.18-1.23.

Female. Idiosoma L/W 656/516. Coxal field ( Fig. 13A View FIGURE 13 A – C ): L 306, Cx-3 W 378, Cx-1+2 mL 121, Cx-1+2 lL 206. Palp ( Fig. 13C View FIGURE 13 A – C ): total L 278, dL and %L (in parentheses) P-1 26 (9.4), P-2 56 (20.1), P-3 76 (27.3), P-4 87 (31.3), P-5 33 (11.9); L P-2/P-4 0.64. Genital field (Fig. 813A): L/W 135/153, genital plate L 94, L Ac-1- 3: 32-33-38.

I-Leg ( Fig. 13B View FIGURE 13 A – C ): I-Leg-5 dL 183, vL 108, dL/vL 1.69, HB 58, dL/HB 3.16, S-1 L 129, L/ W 12.2, S-2 L 99, L/ W 5.7, distance of sword setae at I-Leg-5 35, L S-1/2 1.3; I-Leg-6 L 163, HB 18, L/HB 9.3; L I-Leg-5/6 1.12.

Remarks. The specimens from Thailand agree with Atractides schwoerbeli , known from Burma ( Lundblad 1969) due to the presence of striated dorsal integument, a weak sexual dimorphism of P-2, a narrow S-1 and -2 interspace, thickened I-Leg-6 and a long and slender I-Leg-6. The males have a Vgl-3 fused to Cx-4, but this character is known to be variable (see Figs. 9A View FIGURE 9 A – D , 12A View FIGURE 12 A – D ).

The specimens from Jerian stream, Malaysia, differ from specimens of A. schwoerbeli from Burma (see Lundblad 1969) and our material from Thailand in a slightly more distant S-1 and S-2 on I-Leg-5 and more slender I-Leg-6. Further studies on the variability of populations of A. schwoerbeli are necessary before we can assess the taxonomic status of these specimens.

Distribution. Burma ( Lundblad 1969), Sri Lanka. New for Thailand and Malaysia.