Monatractides vafaei Pesic

Pesic, Vladimir & Saboori, Alireza, 2004, Water mite species of the genus Monatractides K. Viets (Acari: Hydrachnidia, Torrenticolidae) from Iran, with the description of two new species, Zootaxa 673, pp. 1-10: 4-7

publication ID

http://doi.org/ 10.5281/zenodo.158818

persistent identifier

http://treatment.plazi.org/id/0394991E-6B5D-036A-2A3D-FBBAFE9AAE19

treatment provided by

Plazi

scientific name

Monatractides vafaei Pesic
status

sp. nov.

Monatractides vafaei Pesic  sp. nov.

( Fig. 10–16View FIGURES 10 – 16)

Type material: Holotype: male, dissected and slide mounted in Hoyer's fluid. Iran: IR 46 Tehran Province, Charan stream in Charan village (35 ° 54 ' 34 N 51 ° 7 ' 28 E), 2107 m asl., 14.08. 2003, leg. Pesic & Saboori; Paratypes: 8 males, same data as holotype, one of them dissected and slide mounted in Hoyer's fluid.

Other material: IR 60 Markazi Province, Ghareh Chai stream, 30km after Tafresh city, ca. 2100 m asl., 24.08. 2003, leg. Pesic, one male and one juvenile female, dissected and slide mounted in Hoyer's fluid.

Diagnosis (Males): Dorsal shield with a relatively wide frontal plate (L/ W 1.46 –1.57), shoulder plate with a posteriorly­directed ridge; medial suture line of Cx­ 2 + 3 relatively long; three pairs of knob­shaped protrusions at the margin of the gnathosomal bay; chelicerae with robust basal segment (ratio length/height 6.5–6.8); distal margins of P­ 2 and P­ 3 bearing denticles.

Description: Males (type material, in brackets male from IR 60): Idiosoma ( Fig. 11View FIGURES 10 – 16) L 850–858 (852), W 658–671 (700); dorsal shield ( Fig. 10View FIGURES 10 – 16) L 692 (725), W 542 (542), L/W ratio 1.28 (1.34); dorsal plate L 608–617 (650); shoulder plate L/W 217–221 (233)/ 92–96 (92), L/W ratio 2.3–2.36 (2.5), with a posteriorly­directed ridge; frontal plate L/W 150– 165 (146)/ 100–105 (100), L/W ratio 1.5–1.57 (1.46); shoulder/frontal plate L ratio 1.34– 1.45 (1.6); gnathosomal bay L 170–175 (171), its lateral margin with knob –shaped protrusions: one pair at the apical tip of Cx­ 1, two further pairs distally and proximally from the subapical seta; Cx­ 1 L 304–305 (296), median L 127–138 (123); Cx­ 2 + 3 median L 119– 129 (125); ratio Cx­ 1 L/Cx­ 2 + 3 median L 2.2–2.4 (2.4); Cx­ 1 median L/Cx­ 2 + 3 median L 0.98–1.16 (0.98); genital field L/W 156–158 (163)/ 133 (138), L/W ratio 1.17–1.19 (1.18), ejaculatory complex L 213–219 (238); distance genital field –excretory pore 183–192 (181); genital field –caudal body margin 283–292 (288); gnathosoma ( Fig. 15View FIGURES 10 – 16) ventral L 188–208 (190), dL 223–231 (225); chelicera ( Fig. 16View FIGURES 10 – 16) L 229–242 (242), H 35.4 (39.6), L/ H ratio 6.5–6.8 (6.1), cheliceral basal segment L 190–198 (200), claw L 44–46 (44), basal segment/claw L ratio 4.3 (4.5); palp ( Figs. 13–14View FIGURES 10 – 16) total L 242–250 (246), dorsal length of palp segments: P­ 1 27 (29), P­ 2 71–75 (73), P­ 3 50 (48), P­ 4 63–65 (63), P­ 5 31–33 (33); relative length (given as % of total length) of palp segments: P­ 1 10.8–11.2 (11.8), P­ 2 29.3 –30.0 (29.7), P­ 3 20.0– 20.7 (19.5), P­ 4 26.0 (25.6), P­ 5 13.2–13.6 (13.4); P­ 2 /P­ 4 ratio 1.1–1.15 (1.2); distal margins of P­ 2 and P­ 3 with denticles, P­ 4 with a denticle near insertion of the ventral hairs and a strong mediodistal peg­like seta.

In the following, we give additional measurements of the specimens from IR 60 which are suspected to represent the juvenile female of Monatractides vafaei  sp. nov. Idiosoma L 850, W 742; dorsal shield ( Fig. 12View FIGURES 10 – 16) L 704, W 550, L/W ratio 1.28; dorsal plate L 608; shoulder plate L/W 233 / 104, L/W ratio 2.24; frontal plate L/W 156 / 113, L/W ratio 1.38; shoulder/frontal plate L ratio 1.49; gnathosomal bay L 200; Cx­ 1 L 300, median L 133; Cx­ 2 + 3 median L 96; ratio Cx­ 1 L/Cx­ 2 + 3 median L 2.25; Cx­ 1 median L/Cx­ 2 + 3 median L 1.38; genital field L/W 217 / 204,L/W ratio 1.06; distance genital field –excretory pore 196; gnathosoma ventral L 229, dorsal length 263; chelicera L 263, H 42, L/H ratio 6.3, cheliceral basal segment L 213, claw L 50, basal segment/claw L ratio 4.3; palp total L 275, dorsal length and relative length (given in parentheses as % of total length) of palp segments: P­ 1 31 (11.3), P­ 2 81 (29.5), P­ 3 56 (20.4), P­ 4 72 (26.2), P­ 5 35 (12.7); P­ 2 /P­ 4 ratio 1.13.

Discussion: In the combination of the presence of three pairs of knob­shaped protrusions at the margin of the gnathosomal bay, a rather long medial suture line of Cx­ 2 + 3 in males, and distal margins of P­ 2 and P­ 3 bearing al least one pointed denticle, Monatractides vafaei  sp. nov. is similar to M. algeriensis  . As compared with M. algeriensis  (data in parentheses from Di Sabatino et al. 1992), M. vafaei  is characterized by the following features: ejaculatory complex shorter, L 213–238 (L 256–280), minor genital field dimensions, L/W 156–163 / 133–138 (L/W 175–187 / 162–175), chelicera relatively thicker, L/H 6.5–6.8 (L/H 7.2–8.3), gnathosomal rostrum less elongated and the distal margins of P­ 2 and P­ 3 bearing more that one denticle.

The male from Markazi Province is in good agreement with the specimens from the locus typicus. Differences are found in a thicker chelicera (L/H 6.1) and a relatively longer shoulder plate (shoulder/frontal plate L 1.6). In view of the good agreement in other measurements these differences are most probably age­depending and/or due to geographical variability.

Etymology: The species is named after Reza Vafaei  (Head of the Department of Entomology, Islamic Azad University in Arak, Iran).

Biology: Rhitrobiont.

Distribution: Iran, only known from the type localities in Markazi and Tehran Provincies.