Monatractides (Monatractides) ironicus , Pešić, Vladimir & Smit, Harry, 2012

Pešić, Vladimir & Smit, Harry, 2012, Water mites of the genus Monatractides (Acari: Hydrachnidia, Torrenticolidae) from Australia, with descriptions of four new species, Zootaxa 3248, pp. 1-24: 15-17

publication ID

http://doi.org/ 10.5281/zenodo.209671

persistent identifier

http://treatment.plazi.org/id/CD2387AF-FFDC-FFE8-FF2D-C3FAFCEEFC44

treatment provided by

Plazi

scientific name

Monatractides (Monatractides) ironicus
status

sp. nov.

Monatractides (Monatractides) ironicus  sp. nov.

( Figs. 8 –9View FIGURE 8 A – HView FIGURE 9 A – C, 14GView FIGURE 14 A – I)

Type material. Holotype male, dissected and slide mounted, Queensland, Gordon Creek, Iron Range NP, 07.ix. 2000 (QM). Paratypes: 3 / 2 /0 (QM), 4 / 2 /0 ( RMNH), same data as holotype, 2 / 2 /0 dissected and slide mounted; East Claudie River, Iron Range NP, 08.ix. 2000 7 / 6 /0 ( RMNH).

Further records. Queensland: West Claudie River, Iron Range NP, 07.ix. 2000 1 /0/0; Middle Claudie River, Iron Range NP, 07.ix. 2000 1 /0/0; Cockatoo Creek, Cape York Peninsula, 11.ix. 2000 2 /0/0; unnamed creek 29 km E of Pascoo River at crossing with Iron Range NP road, Cape York Peninsula, 10.ix. 2000 1 / 1 /0.

Diagnosis. Frontal plate broad (L/W 1.5 –2.0); area of primary sclerotization of the dorsal plate with four dorsoglandularia; capitular bay slender (L/W ratio 4.0– 4.6); anterolateral edges of Cx- 3 strongly protruding and pointed; posterior suture line of Cx- 4 well accentuated, its medial margins approached to each other well posterior to the posterior margin of genital field; Vgl- 2 slightly anterior to excretory pore and away from the line of primary sclerotization; distal margins of P- 2 and - 3 without denticles, ventral seta on P- 4 slender and short; I-L- 6 relatively stout (L/H ratio 2.4–2.6).

Description. Male (holotype, in parentheses paratypes, n = 2): Idiosoma (ventral view: Fig. 8 BView FIGURE 8 A – H) L 794 (756– 775), W 475 (447–466); dorsal shield ( Fig. 8 AView FIGURE 8 A – H) L 606 (581–594), W 414 (400–406), L/W ratio 1.46 (1.45–1.46); dorsal plate 550 (534–539); shoulder plate L 159–163 (153–170), W 61–62 (58–69), L/W ratio 2.61–2.63 (2.3– 2.74); frontal plate L 108–110 (92–99), W 59–62 (58–59), L/W ratio 1.74–1.86 (1.56–1.68); shoulder/frontal plate L ratio 1.47–1.48 (1.6–1.79); colour pattern as illustrated in Fig. 14 GView FIGURE 14 A – I; capitular bay L 171 (159–169), W 38 (37), L/W ratio 4.5 (4.57); Cx- 1 total L 284 (272–278), Cx- 1 medial L 113 (109–113), Cx- 2 + 3 medial 81 (73–81); ratio Cx- 1 L/Cx- 2 + 3 medial L 3.5 (3.4–3.7); Cx- 1 medial L/Cx- 2 + 3 medial L 1.4 (1.35–1.55); genital field posteriorly narrowed, L/W 138 (133–138)/ 106 (100–106), L/W ratio 1.3 (1.3–1.33); ejaculatory complex ( Fig. 8 EView FIGURE 8 A – H) normal in shape, L 181 (180–188); distance genital field –excretory pore 219 (200–203), genital field –caudal idiosoma margin 287 (261–272); capitulum ( Fig. 9 BView FIGURE 9 A – C) ventral L 173 (158–165); chelicera total L 202 (182–187); palp ( Fig. 9 AView FIGURE 9 A – C): total L 161 (161), dL: P-1, 23 (23–24); P-2, 46 (47–48); P-3, 35 (34); P-4, 42 (42); P-5, 15 (14); P- 2 /P- 4 ratio 1.1 (1.12–1.14); L I- 4-6 ( Fig. 8 CView FIGURE 8 A – H): 73 (68–69), 80 (74–78), 82 (79–80); I-L- 6 L/H 2.49 (2.45–2.5).

Female (paratypes, n = 2): Idiosoma (ventral view: Fig. 9View FIGURE 9 A – C H) L 763–813, W 463–506; dorsal shield ( Fig. 9View FIGURE 9 A – C G) L 581–628, W 400, L/W ratio 1.45–1.57; dorsal plate 537–578; shoulder plate L 147–163, W 50–65, L/W ratio 2.48– 3.1; frontal plate L 94–106, W 50–63, L/W ratio 1.68 –2.0; shoulder/frontal plate L ratio 1.47–1.65; colour pattern as in male; capitular bay L 164–166, W 42, L/W ratio 4.0; Cx- 1 total L 275–284, Cx- 1 medial L 109–120, Cx- 2 + 3 medial 60–67; ratio Cx- 1 L/Cx- 2 + 3 medial L 4.2–4.6; Cx- 1 medial L/Cx- 2 + 3 medial L 1.79–1.8; genital field pentgonal, L/W 144–150 / 125–129, L/W ratio 1.15–1.16; eggs (n = 3) maximum diameter L 169–178; distance genital field –excretory pore 225–234, genital field –caudal idiosoma margin 274–303; capitulum ventral L 164–175; chelicera total L 190–197; palp ( Fig. 9 CView FIGURE 9 A – C): total L 151–164, dL: P-1, 23– 25; P-2, 45– 48; P-3, 31– 34; P-4, 39– 43; P-5, 13– 14; P- 2 /P- 4 ratio 1.11–1.15; L I- 4-6: 67 –72, 71–76, 76– 79; I-L- 6 L/H 2.56–2.57.

Discussion. Due to the relatively broader frontal plates, a short medial suture line of Cx- 2 + 3 in males, the absence of knob-shaped protrusions at the lateral margin of the capitular bay and extended postgenital area in both sexes, Monatractides ironicus  sp. nov. most closely resembles M. australicus  . In both sexes, M. ironicus  sp. nov. can be distinguished by suture lines of Cx- 4 medially approached to each other, well posterior to the posterior margin of the genital field (suture line of Cx- 4 medially approached to each other close to the posterior margin of genital field in M. australicus  ) and Vgl – 2 located slightly anterior to, or on the level of, the excretory pore, away from the line of primary sclerotization (Vgl – 2 well posterior to the excretory pore which lays in an identation of the line of primary sclerotization in M. australicus  ). Further differences concern the more narrower capitular bay, a more slender male genital field, and the more elongated capitulum in M. ironicus  sp. nov.

Etymology. Named after its occurence in Iron Range National Park; the name is a noun in apposition. Distribution. Australia: Queensland (present study).

RMNH

National Museum of Natural History, Naturalis