Monatractides longiventris (K. Viets, 1939 )

Pešić, Vladimir & Smit, Harry, 2014, Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo, Zootaxa 3840 (1), pp. 1-72 : 35-38

Monatractides longiventris (K. Viets, 1939)

( Figs. 28A–B , 29A–B , 30A , Tab. 1 )

Atractides longiventris K. Viets 1939: 429 . Material examined. Malaysia, Borneo , Mahua stream, downstream of national park entrance, Crocker Range , 5º46.491 N, 116º25.770 E, alt. 865 m asl., 22.ix.2012 Smit 2/1/0 (1/1/0 mounted); Mahua stream, Mahua, Crocker Range, 5º47.838 N, 116º24.510 E, alt. 1052 m asl., 21.ix.2012 Smit 2/6/0; Mahua stream at crossing with main road, Crocker Range, 5º45.225 N, 116º26.085 E, alt. 752 m asl., 22.ix.2012 Smit 0/1(ov.)/0; Kipungit River , Poring Hot Springs, Mt Kinabalu , 6º02.776 N, 116º41.432 E, 568 m asl., 15.ix.2012 Smit 0/1/0; stream Kemantis, Sayap, Mt Kinabalu, 6º09.841 N, 116º33.936 E, alt. 928 m asl., 16.ix.2012 Smit 1/0/0; Great Lumotok stream, Mt Kinabalu, 6º09.336 N, 116º34.056 E, alt. 1087 m asl., 17.ix.2012 Smit 0/1/0.

Compared material

Monatractides longiventris (K. Viets, 1939) : Holotype ♂, SMF 45744 Torrenticola longiventris ♂, type, K.Viets 47716, Ost-Java, Idjen-Plateau, Goenoeng Blaoe, 1938 Lucht coll.

Morphology

General features —Idiosoma elongated (dorsal shield L/W ratio 1.6-1.7); shoulder plates elongated (shoulder/ frontal plate L ratio 1.2-1.3); frontal margin with flat protrusions medial to the eyes; Cxgl-4 located far anteriorly, near tips of Cx-I; gnathosomal bay U-shaped; suture line of Cx-IV lightly accentuated, originating from lateral edge of genital field and extending posteriorly beyond posterior margin of genital field ( Figs. 29 A-B); Vgl-2 posterior to excretory pore; P-2 and P-3 distal margins without pointed tips, P-4 without denticles near insertion of ventral setae. Male: medial margin of Cx-II/III relatively long; genital field subrectangular; ejaculatory complex normal in shape (proximal and distal arms and proximal chamber well developed, Fig. 30A ); excretory pore and Vgl- 2 slightly away from the line of primary sclerotization, near posterior margin of idiosoma. Female: genital field pentagonal, anteriorly enlarged, laterally straight, tapering posteriorly ( Fig. 29B ); excretory pore and Vgl- 2 located posterior to line of primary sclerification.

Remarks. The specimens from Borneo agree well in general morphology with Monatractides longiventris , a species originally described from Java (K. Viets 1939). The original description was restricted to the male; a first description of the female from Central Java was given by Lundblad (1971). In comparison with the holotype, specimens examined in our study are smaller, but do not differ in proportions and general idiosoma and palp morphology ( Table 1 ).

Distribution. Java (“ Atractides longiventris ” K. Viets 1939 , “ T. longiventris ” Lundblad 1971 ). New for Borneo.

Figures

FIGURE 28A–I. Photographs of dorsal shield. A–B Monatractides longiventris (K. Viets, 1939), Mahua stream: A = male; B = female. C–D M. parviventris (K. Viets, 1935): C = female, stream Bansadon Trail; D = male, Kemantis stream. E M. oxystomus (K. Viets, 1935), male, Kipungit River. F–G M. cf. macroporus (K. Viets, 1935): F = male, stream Bansadon Trail; G = female, Little Lumotok stream. H–I M. epiales n. sp., Kipungit River: H = male; I = female.

FIGURE 29A–I. Photographs of ventral shield. A–B Monatractides longiventris (K. Viets, 1939), Mahua stream: A = male; B = female. C–D M. parviventris (K. Viets, 1935): C = female, stream Bansadon Trail; D = male, Kemantis stream. E M. oxystomus (K. Viets, 1935), male, Kipungit River. F–G M. cf. macroporus (K. Viets, 1935): F = male, stream Bansadon Trail; G = female, Little Lumotok stream. H–I M. epiales n. sp., Kipungit River: H = male; I = female.

FIGURE 30A–M. Photographs of ejaculatory complex. A Monatractides longiventris (K. Viets, 1939), Mahua stream. B M. oxystomus (K. Viets, 1935), Kipungit River. C–D M. cf. macroporus (K. Viets, 1935): C = stream Bansadon Trail; D = Little Lumotok stream. E–F M. epiales n. sp., Kipungit River: E = holotype; F = paratype. G M. phantasos n. sp., Great Lumotok stream. H M. phobetor n. sp., Little Lumotok stream. I–L M. morpheus n. sp. I = holotype, small stream Layang Layang; K = Kemantis stream; K = Little Lumotok stream. M M. heracles n. sp., Little Lumotok stream.