Atractides cf. propatulus ( K. Viets, 1935 )

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 : 8

Atractides cf. propatulus ( K. Viets, 1935)

( Figs. 5A–D )

Material. INDONESIA, Sulawesi Utara: S. Tumokang, at park headquarters, Dumoga-Bone NP, 9.iv.1991 leg. Smit, 0/2/0 (0/1/0 mounted); S. Tumokang, near Matayangan, Dumoga-Bone NP, 9.iv.1991 leg. Smit, 0/1/0; S. Uuwan, near Uuwan, 9.iv.1991 leg. Smit, 0/1/0; S. Pusian, between Kotamobagu and Imandi, 21.iv.1991 leg. Smit, 0/3/0.

Morphology. General features. Integument dorsally striated. Muscle attachment plates unsclerotized. Genital field: Ac in triangular arrangement; excretory pore smooth; Vgl-1: separate to Vgl-2. Palp: weak sexual dimorphism; P-2 ventral margin straight, sword seta of P-4 between ventral hair insertions. I-Leg: setae S-1 and -2 with narrow interspace, S-1 slender, with truncate tip, S-2 slightly thicker, bluntly pointed; I-Leg-6 curved, basally slightly thickened, from the centre to the claw furrow with parallel ventral and dorsal margins.

Female (from S. Tumokang, at park headquarters). Idiosoma L/W 662/575. Coxal field ( Fig. 5A ): L 306, Cx/3 W 422, Cx-1+2 mL 117, Cx-1+2 lL 231. Palp ( Fig. 5D ): total L 322, dL and %L (in parentheses): P-1 30 (9.3), P-2 67 (20.8), P-3 92 (28.6), P-4 96 (29.8), P-5 37 (11.5); L P-2/P-4 0.7. Genital field ( Fig. 5B ): L/W 134/136, genital plate L 97-102, L Ac-1-3: 31-30-32; egg (n=2) maximum diameter 100-102.

I-Leg ( Fig. 5C ): I-Leg-5 dL 189, vL 136, dL/vL 1.39, HB 53, dL/HB 3.6, S-1 L 90, L/ W 11.8, S-2 L 77, L/ W 7.9, distance of sword setae at I-Leg-5 18, L S-1/2 1.16; I-Leg-6 L 131, HB 23, L/HB 5.8; L I-Leg-5/6 1.44.

Remarks. The specimens from Sulawesi fit the description given by K. Viets (1935) for Atractides propatulus , a species described from South Sumatra, Indonesia. However, our specimens differ in a larger idiosoma, I-Leg-5/6 and palp dimensions. Due to the fact that we do not have male specimens, this is only a tentative assignment. The variability of further specimens needs to be examined to clarify the taxonomy.

Distribution. Indonesia.

Figures

FIGURE 5 A – D. Atractides propatulus K. Viets, 1935, female, S. Tumokang, at park headquarters, Sulawesi: A = coxal and genital field; B = genital field; C = I-Leg- 5 and - 6; D = palp, lateral view. Scale bar = 100 μm.