Monatractides cf. macroporus (K. Viets, 1935 ),

Pešić, Vladimir & Smit, Harry, 2014, Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo, Zootaxa 3840 (1), pp. 1-72: 42-44

publication ID

http://dx.doi.org/10.11646/zootaxa.3840.1.1

publication LSID

lsid:zoobank.org:pub:CDF827EB-8A66-438F-AC5C-07A7D3D83BB9

DOI

http://doi.org/10.5281/zenodo.5110180

persistent identifier

http://treatment.plazi.org/id/F535879E-7E4D-FFEA-FF0D-FF2DD68AFC5D

treatment provided by

Felipe

scientific name

Monatractides cf. macroporus (K. Viets, 1935 )
status

 

Monatractides cf. macroporus (K. Viets, 1935)  

( Figs. 24A–D View FIGURE 24 , 26B View FIGURE 26 , 28F–G View FIGURE 28 , 29F–G View FIGURE 29 , 30C–D View FIGURE 30 , Tabs. 2–3 View TABLE 2 View TABLE 3 )

Atractides macroporus K. Viets 1935: 577   .

Atractides macrognathus K. Viets 1935: 584   — Lundblad 1971: 320.

Material examined. Malaysia, Borneo , unnamed stream Bansadon Trail , Inobong, Crocker Range, 5º51.456 N, 116º08.403 E, alt. 436 m asl, 18.ix.2012 Smit 1/0/0 (mounted); small stream waterfall trail GoogleMaps   Inobong, 5º51.306 N, 116º08.292 E, alt. 482 m asl., 19.ix.2012 Smit 1/1/0 (mounted) GoogleMaps   .

Compared material

Monatractides macroporus ( K. Viets, 1935)   : Holotype ♂, SMF 4422 View Materials Torrenticola macropora   ♂, type, K.Viets 47766, Sumatra, Ranau Urwaldbaches bei Aer Pisaup 22.1.1929; SMF 4431 View Materials Torrenticola macropora   ♀, type, K.Viets 47763, Sumatra, Musi bei Aer Simpang, 650 m, 6.5.1929.

Monatractides macrognathus (K. Viets, 1935)   : SMF 4173 View Materials Torrenticola macrognatha   1♂, 2♀, K.Viets 47733, Java, Zufluβbaches des Ranoe Bedali, 2.11.1928   .

Monatractides major (K. Viets, 1935)   : SMF 4173 View Materials Torrenticola macrognatha   1♂, 2♀, K.Viets 47733, Java, Zufluβbaches des Ranoe Bedali, 2.11.1928   .

Morphology

Male. General features —Idiosoma elongated-oval; frontal plates equal or slightly longer than shoulder plates (shoulder/frontal plate L ratio 0.9); frontal margin medially pointed, between anterolaterally pointed apodemes; Cxgl–4 located far anteriorly, near tips of Cx-I; gnathosomal bay deep, narrow U-shaped ( Fig. 24B View FIGURE 24 ); suture line of Cx-IV distinct, originating from lateral edge of genital field and extending posteriorly beyond posterior margin of genital field; excretory pore and Vgl-2 away from the line of primary sclerotization, Vgl–2 slightly posterior to excretory pore; gnathosoma elongated in lateral view, rostrum truncated; ventral and dorsal setae of P-2 and P-3 relatively strong and long, P-2 and P-3 distal margins without pointed tips, P-4 ventral setae short ( Fig. 24C View FIGURE 24 ). Male: medial margin of Cx-II/III relatively short; genital field subrectangular in shape; ejaculatory complex ( Figs. 30C–D View FIGURE 30 ): proximal and distal arms well developed, carina anterior long, proximal chamber small ( Fig. 26B View FIGURE 26 ).

Measurements

Male (from unnamed stream Bansadon Trail, in parentheses some measurements of specimen from stream waterfall trail Inobong)—Idiosoma (ventral view: Fig. 29F View FIGURE 29 ) L 631 (637), W 394 (407); dorsal shield ( Fig. 28F View FIGURE 28 ) L 503 (506), W 365 (370), L/W ratio 1.38 (1.37); dorsal plate L 453 (453); shoulder plate L 111–114 (125–128), W 56 (59–62), L/W ratio 2.0 (2.1); frontal plate L 128–131 (123–128), W 56–58 (59–61), L/W ratio 2.2–2.3 (2.0–2.2); shoulder/frontal plate L ratio 0.87 (0.98–1.03). Gnathosomal bay L/W 140 (134)/34 (31), ratio 4.1 (4.3), Cx-I total L 234 (239), Cx-I mL 94 (105), Cx-II+III mL 73 (61); ratio Cx-I L/Cx-II+III mL 3.2 (3.9); Cx-I mL/CxII+III mL 1.3 (1.7). Genital field L/W 116 (122)/91 (91), ratio 1.28 (1.35); ejaculatory complex L 154 (153); distance genital field-excretory pore 156 (150), genital field-caudal idiosoma margin 213 (216). Gnathosoma vL 132 (136); chelicera total L 143 (145); palp total L 143, dL/H, dL/H ratio: P-1, 20/16, 1.23; P-2, 40/31, 1.3; P-3, 31/ 26, 1.18; P-4, 37/19, 2.0; P-5, 15/9, 1.7; P-2/P-4 ratio 1.08. Legs: dL of I-I-2–6: 42 (45), 45 (45), 57 (57), 65 (66), 71 (71), I-L-6 H 29 (28), L/H I-L-6 ratio 2.5 (2.5).

In addition we give locality records and measurements of female specimens suspected to belong to M. cf. macroporus   .

New records. Great Lumotok stream, Mt Kinabalu , 6º09.336 N, 116º34.056 E, alt. 1087 m asl., 17.ix.2012 Smit 0/1/0; Little Lumotok stream, GoogleMaps   Sayap, Mt Kinabalu, 6º09.467 N, 116º34.027 E, alt. 1069 m asl., 17.ix.2012 Smit 0/1/0; GoogleMaps   Kibamabangan River, at waterfall, Crocker Range, 5º51.280 N, 116º08.417 E, 433 m asl., 18.ix.2012 Smit 0/1/0 GoogleMaps   .

Measurements

Female (from Little Lumotok stream, n = 1)—Idiosoma (ventral view: Fig. 29G View FIGURE 29 ) L 818, W 587; dorsal shield ( Fig. 28G View FIGURE 28 ) L 681, W 488, L/W ratio 1.4; dorsal plate L 619; shoulder plate L 167–169, W 64–69, L/W ratio 2.5–2.6; frontal plate L 138–140, W 77, L/W ratio 1.8; shoulder/frontal plate L ratio 1.19–1.23. Gnathosomal bay L/W 173/34, ratio 5.1, Cx-I total L 322, Cx-I mL 148, Cx-II+III mL 53; ratio Cx-I L/Cx-II+III mL 6.1; Cx-I mL/ Cx-II+III mL 2.8. Genital field L/W 156/138, ratio 1.14; distance genital field-excretory pore 184, genital fieldcaudal idiosoma margin 184. Gnathosoma vL 208; chelicera total L 222; palp total L 179, dL/H, dL/H ratio: P-1, 25/23, 1.07; P-2, 52/37, 1.41; P-3, 38.5/28, 1.39; P-4, 41/18.5, 2.2; P-5, 22/11, 2.1; P-2/P-4 ratio 1.27. Legs: dL of I-I-4–6: 88, 92, 91–92, I-L-6 H 26.5, L/H I-L-6 ratio 3.45.

Remarks. The specimens from Borneo match the general morphology of Monatractides macroporus   , a species described by K. Viets (1935) from Sumatra based on a single male and one female specimen under question mark. In the same paper Viets (1935) described two species, closely related to the latter, M. macrognathus (K. Viets, 1935)   and M. macrognathus major (K. Viets, 1935)   . Lundblad (1971) considered the latter two species synonymous with M. macroporus   . However, Wiles (1991) rejected the synonymization of the latter species with M. macroporus   and raised M. macrognathus major   to a full species. Monatractides major   is characterized at first line in comparison with the two abovementioned species by having four dorsoglandularia incorporated in the area of primary sclerotization. Monatractides macroporus   (as well the specimens examined from Borneo) has a narrower gnathosomal bay than M. macrognathus   (compare measurements in Tables 2 View TABLE 2 and 3 View TABLE 3 ) but this character is known to be variable in this species ( Lundblad 1971). At the time being we keep M. macrognathus   as synonym of M. macroporus   .

In comparison with the holotype of M. macroporus   and specimens of M. macrognathus   from Java (see Tables 2–3 View TABLE 2 View TABLE 3 ), males examined in our study are notably smaller, and differ in having much shorter shoulder plates, more or less equal in dimensions to frontal plates, stouter I-L-6 and anterior dorsoglandularia shifted far anterior from medial muscle scar (lying near anterior end of medial muscle scar in specimens from Java). Thus, our assignment of the specimens from Borneo to M. macroporus   is tentative, and very probably specimens from Borneo belong to a new species. However, only with application of molecular techniques it will be possible to decide whether this is really just a variable species or a complex of several similar species.

Furthermore, as already stated by Pešić & Smit (2009b) understanding the taxonomic position of other species ( M. macroporus (K. Viets, 1935)   , M. major (K. Viets, 1935)   , M. angulatus (Walter, 1928)   , M. minor Wiles, 1991   , and M. nondescripta (Cook, 1966))   tentatively included in the so-called M. macroporus- complex is not possible without additional material from a wide area and/or without the application of molecular techniques.

Wiles (1999) reported a single specimen, which best fits the description of M. macrognathus   in the River Temburong (North Brunei). He mentioned that “there are other specimens that are not such a good fit and their status must await further investigation”.

Distribution. Sumatra (“ Atractides macroporus   , A. macrognathus ” K. Viets 1935   ), Java (“ A. macrognathus ” K. Viets 1935   , “ Torrenticola macropora ” Lundblad 1971   ). New for Borneo.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Trombidiformes

Family

Torrenticolidae

Genus

Monatractides

Loc

Monatractides cf. macroporus (K. Viets, 1935 )

Pešić, Vladimir & Smit, Harry 2014
2014
Loc

Atractides macroporus K. Viets 1935: 577

Viets, K. 1935: 577
1935
Loc

Atractides macrognathus K. Viets 1935: 584

Lundblad, O. 1971: 320
Viets, K. 1935: 584
1935