Atractides (Atractides) neospatiosus, n. sp.
Creators: name: Smit, Harry
name: Pešić, Vladimir
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Hygrobatidae
Atractides
Atractides neospatiosus

description: 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, 5° 49.249 N 116° 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, 5°51.280 N, 116°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, 5° 50.039 N 116° 20.156 E, alt. 1571 m asl., 24-ix-2012; 1/0/0, Little Lumotok stream, Sayap, Borneo, Malaysia, 6° 0 9.467 N 116° 34.027 E, alt. 1069 m asl., 17-ix-2012; 1/1/ 0, Mahua stream, Mahua, Crocker Range, Borneo, Malaysia, 5° 47.838 N, 116° 24.510 E, alt. 1052 m asl., 21-ix-2012; 2/4/0, Kipungit River, Poring Hot Springs, Mt. Kinabalu, Borneo, Malaysia, 6° 0 2.776 N 116° 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.
description: Published as part of 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, pp. 1-71 in Zootaxa 3876 (1) on pages 24-25, DOI: 10.11646/zootaxa.3876.1.1, http://zenodo.org/record/287281