Monatractides K. Viets, 1926

Genus Monatractides K. Viets, 1926

Monatractides ( Monatractides) alticolus Peši ć & Smit, 2011

New records. Indonesia, New Guinea, West Papua province: stream Ilik near Lake Gita, Anggi Lakes, 17.xi.2011, 1˚ 21.423 S, 133˚ 58.553 E, alt. 1912 m asl, 2/0/0 (1/0/0 mounted); stream ca. 3 km S of Mokwam, 08.xi.2011, 1˚ 05.877 S, 133˚ 54.223 E, alt. 1637 m asl, 3/0/0 (1/0/0 mounted).

Distribution. New Guinea: Papua province ( Pešiċ & Smit 2011); West Papua province (present study).

Monatractides (Monatractides) humilis Peši ć & Smit, 2011

New records. Indonesia, New Guinea: West Papua province: river at Warkapi, S of Manokwari, 13.xi.2100, 1˚ 0 9.978 S, 134˚ 0 7.028 E, alt. 101 m asl, 1/0/0; river Ngamung, 15.xi.2011, 1˚ 14.466 S, 133˚ 52.538 E, alt. 1833 m asl, 1/1/0 (1/0/0 mounted). Papua province: river Yabawi, upstream of Harapan, 30.x.2011, 2˚ 34.216 S, 140˚ 33.723 E, alt. 120 m asl, 6/7/0; unnamed creek N of Sentani, 30.x.2011, 2˚ 32.734 S, 140˚ 29.270 E, alt. 177 m asl, 3/1/3 (1/0/0 mounted); unnamed creek N of Sentani (after flash flood), 31.x.2011, 2˚ 32.734 S, 140˚ 29.271 E, alt. 177 m asl, 7/2/3.

Distribution. New Guinea: Papua province ( Pešiċ & Smit 2011; present study); West Papua province (present study).

Monatractides ( Monatractides) cf. nipsanicus Peši ć & Smit, 2011 ( Figs. 1A–E View FIGURES 1 A – E , 2 View FIGURE 2 )

New records. Indonesia, New Guinea, West Papua province: river Ngamung, 15.xi.2011, 1˚ 14.466 S, 133˚ 52.538 E, alt. 1833 m asl, 4/3/0 (2/1/0 mounted); river Asiti, W of Senopi, 22.xi.2011, 0˚ 51.469 S, 132˚ 54.957 E, alt. 502 m asl, 1/0/0.

Morphology. Male (from river Ngamung, n = 2): Idiosoma: (ventral view: Fig. 1B View FIGURES 1 A – E ) L 869–897, W 572–578; dorsal shield ( Fig. 1A View FIGURES 1 A – E ) L 731–763, W 469–481, L/W ratio 1.56–1.59; dorsal plate 705–719; shoulder plate L 200–209, W 66–78, L/W ratio 2.7–3.0; frontal plate L 150–164, W 56–67, L/W ratio 2.4–2.7; shoulder/frontal plate L ratio 1.27–1.35; capitular bay L 166–194, W 81–84, L/W ratio 2.1–2.3; Cx-1 total L 298–334, Cx-1 medial L 131–141, Cx-2+3 medial L 67; ratio Cx-1 L/Cx-2+3 medial L 4.4–5.0; Cx-1 medial L/Cx-2+3 medial L 2.0–2.1; genital field L/W 181–192/123–134, L/W ratio 1.43–1.47, ejaculatory complex L 213–217; distance genital field–excretory pore 180–194, genital field–caudal idiosoma margin 292–306; capitulum ( Fig. 1D View FIGURES 1 A – E ) ventral L 220–239; chelicera total L 277–288; palp ( Fig. 1C View FIGURES 1 A – E ) total L 267–275, dL: P-1, 37; P-2, 73–79; P-3, 52–54; P-4, 72–76; P-5, 31; L P-2/P-4 ratio, 1.01–1.04; L I-4–6 ( Fig. 1E View FIGURES 1 A – E ): 119–151, 129–163, 132–157; I-L-6 L/H ratio, 3.0–3.1.

Female (from river Ngamung, n = 1): Idiosoma: (ventral view: Fig. 2 View FIGURE 2 ) L 828, W 625; dorsal shield L 791, W 516, L/W ratio 1.53; dorsal plate 750; shoulder plate L 209–214, W 66–75, L/W ratio 2.9–3.2; frontal plate L 153–155, W 63–68, L/W ratio 2.3–2.4; shoulder/frontal plate L ratio 1.37–1.38; capitular bay L 188, W 80, L/W ratio 2.35; Cx-1 total L 322, Cx-1 medial L 134, Cx-2+3 medial L 37; ratio Cx-1 L/Cx-2+3 medial L 8.7; Cx-1 medial L/Cx-2+3 medial L 3.6; genital field L/W 195/153, L/W ratio 1.28; distance genital field–excretory pore 184, genital field–caudal idiosoma margin 363; capitulum ventral L 229; chelicera total L 283; palp total L 257, dL: P-1, 33; P-2, 71; P-3, 54; P-4, 71; P-5, 28; L P-2/P-4 ratio, 1.0; L I-4–6: 138, 147, 147; I-L-6 L/H ratio, 3.1.

Remarks. In view of the similar shape of the idiosoma (e.g. idiosoma and genital field elongated, dorsal shield L/W> 1.5, genital field L/W ratio> 1.4, excretory pore on the line of primary sclerotization) and palps, these specimens show a general conformity with Monatractides nipsanicus Pešiċ & Smit 2011 , a species known only from a single male specimen from the Nipsan district in Papua province ( Pešiċ & Smit 2011). Differences are found in the major idiosoma and gnathosoma dimensions and the considerably elongated genital field (L/W ratio 1.6) in the holotype of M. nipsanicus . Study of more material of the latter species from the locus typicus is necessary before a decision can be made whether specimens from West Papua represent an undescribed ‘western’ sister species of M. nipsanicus or our data enlarge the known variability of the latter.

Monatractides ( Monatractides) sentanicus Peši ć & Smit, 2011 ( Fig. 3A–C View FIGURES 3 A – C )

New records. Indonesia, New Guinea, Papua province, unnamed creek N of Sentani (after flash flood), 31.x.2011, 2˚ 32.734 S, 140˚ 29.271 E, alt. 177 m asl, 0/1/0 (mounted).

Morphology. Female. Idiosoma (ventral view: Fig. 3B View FIGURES 3 A – C ) L 675, W 419; dorsal shield ( Fig. 3A View FIGURES 3 A – C ) L 578, W 353, L/W ratio 1.64; dorsal plate 545; shoulder plate L 175, W 56, L/W ratio 3.1; frontal plate L 100–103, W 47–48, L/ W ratio 2.1–2.2; shoulder/frontal plate L ratio 1.75; capitular bay L 152, W 73, L/W ratio 2.1; Cx-1 total L 259, Cx-1 medial L 106, Cx-2+3 medial L 24; ratio Cx-1 L/Cx-2+3 medial L 10.8; Cx-1 medial L/Cx-2+3 medial L 4.4; genital field L/W 144/128, L/W ratio 1.13; distance genital field–excretory pore 150, genital field–caudal idiosoma margin 245; capitulum ventral L 179; chelicera L 247; palp ( Fig. 3C View FIGURES 3 A – C ) total L 207, dL: P-1, 27; P-2, 60; P-3, 39; P- 4, 57; P-5, 24; L P-2/P-4 ratio, 1.05; L I-L-4–6: 82, 95, 103; I-L-6 L/H ratio, 2.7.

Remarks. The specimen from the unnamed creek N of Sentani agrees well with the description of M. sentanicus , a species so far only known from a single female specimen from Papua Province (River Pos 7, Sentani, Pešiċ & Smit 2011).

Distribution. New Guinea: Papua province ( Pešiċ & Smit 2011; present study).