Atractides (Atractides) neospatiosus, Smit, Harry & Pešić, Vladimir, 2014

Smit, Harry & Pešić, Vladimir, 2014, Water mites from Mount Kinabalu and the Crocker Range, Borneo, Malaysia (Acari: Hydrachnidia), with the description of 34 new species, Zootaxa 3876 (1), pp. 1-71 : 24-25

Atractides (Atractides) neospatiosus n. sp.

( Figs. 12A , 13A–E )

Type series. Holotype male, dissected and slide mounted, first stream Minduk Sirung Trail, Alab, Crocker Range, Borneo, Malaysia, 5º 49.249 N 116º 19.862 E, alt. 1781 m asl., 23.ix.2012 ( RMNH, slide A8). Paratypes: 2 (juvenile)/1/0, same data as holotype, one female dissected and slide mounted ( RMNH).

Further records. 2/0/0 (1/0/0 mounted), Kibamabangan River, Crocker Range, Borneo, Malaysia, 5º 51.280 N, 116º 08.417 E, alt. 433 m asl., 18-ix-2012; 2/1/0 (1/1/0 mounted), Torrential stream crossing main road Alab- Kota Kinabalu, Crocker Range, Borneo, Malaysia, 5º 50.039 N 116º 20.156 E, alt. 1571 m asl., 24-ix-2012; 1/0/0, Little Lumotok stream, Sayap, Borneo, Malaysia, 6º 0 9.467 N 116º 34.027 E, alt. 1069 m asl., 17-ix-2012; 1/1/ 0, Mahua stream, Mahua, Crocker Range, Borneo, Malaysia, 5º 47.838 N, 116º 24.510 E, alt. 1052 m asl., 21-ix- 2012; 2/4/0, Kipungit River, Poring Hot Springs, Mt. Kinabalu, Borneo, Malaysia, 6º 0 2.776 N 116º 41.432 E, 568 m asl., 15-ix-2012.

Compared material. Atractides spatiosus ( K. Viets, 1935) : Lectotype ♂, here designated, SMF 4322 Atractides spatiosus ♂, type, K.Viets 42768, Java, Tjibodas, 1400 m, Kali Tjiwalen, 14.7.1929. Paralectotype ♀, on the same slide, here designated. The original description does not contain a type designation.

Diagnosis. Integument with very fine striation, nowhere reticulated; I-leg-5 with S-1 and -2 strongly heteromorphic and distanced, S-1 long and slender, with truncate tip, S-2 shortened, enlarged and with pointed tip.

Description. Integument with very fine striation; muscle insertions unsclerotized. Genital field: Ac in a weakly curved line. Excretory pore smooth; vgl-1: separate from vgl-2. Palp: P2 and P3 ventral margins straight, P4 sword seta between ventral setae, nearer to the distal one ( Fig. 13D ). Legs: I-leg-5 with S-1 and -2 strongly heteromorphic and distanced, S-1 long and slender, with truncate tip, S-2 shortened, enlarged and with pointed tip, I-leg-6 long and slender ( Figs. 13C , 12A ). Male: Genital field with anterior margin slightly convex, posterior margin indented.

Measurements

Male (holotype, in parentheses specimen from torrential stream crossing main road Alab-Kota Kinabalu)—Idiosoma length/width 466 (497)/359 (384); coxal field: length 271 (281); Cx-III width (323); Cx-I+II medial length 94 (94), lateral length (181); genital field length/width 87 (95)/105 (99), length Ac 1–3: 29–30 (28–29), 31–32 (31), 29–31 (31–32).

Palp: Total length 272 (275), dorsal length/height, dorsal length/height ratio: P1, 28/21, 1.33 (28/22, 1.29); P2, 54/31, 1.75 (54/32, 1.68); P3, 71/26, 2.72 (71/28, 2.56); P4, 85/19, 4.6 (85/20, 4.26); P5, 34/12, 2.9 (37/12, 3.2); length P2/P4 ratio 0.63 (0.63); capitulum ventral length 94; chelicera total length 142.

Legs: I-leg-5 dorsal length 168 (160), ventral length 87 (83), dorsal length/ventral length ratio 1.93 (1.94), maximum height 43 (42), dorsal length/maximum height 3.89 (3.86), S-1 length 111 (105), length/width ratio 10.3 (11.4), S-2 length 69 (68), length/width ratio 4.45 (4.87), distance S- 1-2 41 –42 (39), length ratio S-1/2 1.6 (1.55); Ileg-6 length 155 (151), central height 14 (12), length/central height ratio 11.1 (12.2); length I-leg-5/6 ratio 1.08 (1.06).

Female (paratype, in parentheses specimen from torrential stream crossing main road Alab-Kota Kinabalu)—Idiosoma length 780 (813); coxal field: length 339 (350); Cx-III width 394 (431); Cx-I+II medial length 100 (109), lateral length 216 (219); genital field length/width 141 (151)/156 (156), genital plates length 111–114 (106–109), length Ac 1–3: 34 (34–35), 36–42 (35–41), 40–41 (31–34).

Palp: Total length 298 (320), dorsal length/height, dorsal length/height ratio: P1, 31/26, 1.18 (32/26, 1.23); P2, 58/37, 1.56 (65/37, 1.75); P3, 86/32, 2.69 (89/31, 2.9); P4, 86/21, 4.14 (95/21, 4.59); P5, 37/12, 3.0 (39/12, 3.4); length P-2/P-4 ratio 0.67 (0.68).

Legs: I-leg-5 dorsal length 174 (208), ventral length 95 (100), dorsal length/ventral length ratio 1.82 (2.08), maximum height 49 (52), dorsal length/maximum height 3.5 (3.97), S-1 length 132 (137), length/width ratio 11.5 (11.9), S-2 length 89 (91), length/width ratio 4.7 (4.5), distance S- 1-2 54 (57), length ratio S-1/2 1.48 (1.5); I-leg-6 length 163 (184), central height 12 (13), length/central height ratio 13.3 (14.0); length I-leg-5/6 ratio 1.07 (1.13).

Etymology. Named because of its similarity to A. spatiosus .

Remarks. The new species is closely related to Atractides spatiosus ( K. Viets, 1935) , a species originally described from Java. Re-examination of the type series showed that this species is characterized by a partly reticulated dorsal integument, a character not found in other Atractides species. In the original description K. Viets (1935) underlined the shape of the integument (thin with fine lineation, dorsally here and there reticulated) in comparison with A. cognatus . In addition to the unique structure of the integument, A. spatiosus differs from A. neospatiosus in a more slender seta S-2 (length/width ratio 7.0–8.0).

Wiles (2009) reported Atractides spatiosus ( K. Viets, 1935) from several sites in the catchment area of the Rivers Temburong and Belalong in North Brunei. Most probably these specimens refer to A. neospatiosus n. sp.

Distribution. Borneo.

Figures

FIGURE 12 A – B. A Atractides neospatiosus n. sp., torrential stream crossing main road Alab-Kota Kinabalu, female: B = Ileg- 5 and - 6. B Atractides cognatus (K. Viets, 1935), Mahua stream, female: B = I-leg- 5 and - 6. Scale bars = 100 Μm.

FIGURE 13 A – E. Atractides neospatiosus n. sp., first stream Minduk Sirung Trail (A, C – D male holotype, B, E female paratype): A = idiosoma, ventral view; B = genital field; C = I-leg- 5 and - 6; D = palp, medial view; E = coxal field. Scale bars = 100 Μm.