Monatractides epiales, Pešić & Smit, 2014

Pešić, Vladimir & Smit, Harry, 2014, Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo, Zootaxa 3840 (1), pp. 1-72: 52-53

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.5110184

persistent identifier

http://treatment.plazi.org/id/F535879E-7E57-FFF5-FF0D-F893D634F86B

treatment provided by

Felipe

scientific name

Monatractides epiales
status

n. sp.

Monatractides epiales   n. sp.

( Figs. 25A–G View FIGURE 25 , 26A View FIGURE 26 , 27A–B View FIGURE 27 , 28H–I View FIGURE 28 , 29H–I View FIGURE 29 , 30E–F View FIGURE 30 )

Type series. Holotype male, dissected and slide mounted, Malaysia, Borneo , Kipungit River , Poring Hot Springs, Mt Kinabalu, 6º02.776 N, 116º41.432 E, 568 m asl., 15.ix.2012 Smit GoogleMaps   . Paratypes: one male, same data as holotype, dissected and slide mounted GoogleMaps   .

Other material: one female dissected and slide mounted same data as holotype GoogleMaps   .

Diagnosis. Male. Idiosoma elongated-oval (dorsal shield L/W ratio 1.3–1.4); frontal plates similar in dimensions to shoulder plates (shoulder/frontal plate L ratio 0.99–1.04); gnathosomal bay deep, narrow U-shaped (L/W ratio 4.6); medial margin of Cx-II/III relatively short; genital field elongated (L/W ratio 1.3–1.4); ejaculatory complex with large proximal chamber, proximal and distal arms short; excretory pore anterior to Vgl–2 and away from the line of primary sclerotization; ventral setae on P-4 short.

Description

Male. General features —Idiosoma elongated-oval; frontal plates similar in dimensions to shoulder plates; frontal margin medially pointed, between anterolaterally pointed apodemes ( Fig. 25A View FIGURE 25 ); Cxgl–4 located far anteriorly, near tips of Cx-I; gnathosomal bay deep, narrow U-shaped ( Fig. 25C View FIGURE 25 ); medial margin of Cx-II/III relatively short; genital field subrectangular in shape; ejaculatory complex characteristic ( Figs. 26A View FIGURE 26 , 30E–F View FIGURE 30 ), proximal chamber large, proximal and distal arms short, carina anterior short; 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 ( Fig. 25F View FIGURE 25 ), 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 ( Figs. 25D–E View FIGURE 25 ).

Measurements

Male (holotype; in parentheses paratype, n = 1)—Idiosoma (ventral view: Figs. 25C View FIGURE 25 , 29H View FIGURE 29 ) L 618 (591), W 394 (369); dorsal shield ( Figs. 25B View FIGURE 25 , 28H View FIGURE 28 ) L 477 (453), W 363 (331), L/W ratio 1.31 (1.37); dorsal plate L 429 (408); shoulder plate L 124–127 (113), W 52–56 (50–53), L/W ratio 2.2–2.4 (2.1–2.3); frontal plate L 122–125 (111), W 53–55 (47–52), L/W ratio 2.3 (2.2–2.4); shoulder/frontal plate L ratio 0.99–1.04 (1.0). Gnathosomal bay L/W 148 (128)/31 (28), ratio 4.8 (4.6); Cx-I total L 250 (227), Cx-I mL 101 (98), Cx-II+III mL 66 (58); ratio Cx-I L/CxII+III mL 3.8 (3.9); Cx-I mL/Cx-II+III mL 1.5 (1.7). Genital field L/W 119 (111)/87 (83), ratio 1.37 (1.34); ejaculatory complex L (166); distance genital field-excretory pore 138 (141), genital field-caudal idiosoma margin 183 (195). Gnathosoma vL 147 (138); chelicera total L 160 (148); palp total L 149 (147), dL/H, dL/H ratio: P-1, 21.5/15, 1.4 (21.5/17, 1.3); P-2, 41.5/31, 1.35 (39/26, 1.5); P-3, 33/26, 1.27 (32/23, 1.4); P-4, 36/17, 2.14 (37/17, 2.19); P-5, 17/9, 1.84 (17/9, 1.85); P-2/P-4 ratio 1.15 (1.06). Legs: dL of I-L-2–6: 45, 52 (52), 65 (65), 69 (69), 71 (68), I-L-6 H 28.5 (26), L/H I-L-6 ratio 2.5 (2.6).

At present, it is impossible to give an unequivocal diagnosis for the female of M. epiales   n. sp. In the following list, measurements are given for a female taken at the locus typicus of M. epiales   n. sp. —Idiosoma (ventral view: Figs. 27A View FIGURE 27 , 29I View FIGURE 29 ) L 700, W 430; dorsal shield ( Fig. 28I View FIGURE 28 ) L 553, W 409, L/W ratio 1.35; dorsal plate L 500; shoulder plate L 122–127, W 64–67, L/W ratio 1.9; frontal plate L 131, W 61–66, L/W ratio 2.0–2.2; shoulder/frontal plate L ratio 0.93–0.96. Gnathosomal bay L 148, Cx-I total L 253, Cx-I mL 106, Cx-II+III mL 46; ratio Cx-I L/Cx-II+III mL 5.5; Cx-I mL/Cx-II+III mL 2.3. Genital field pentagonal in shape, anteriorly enlarged, laterally straight, tapering posteriorly, L/W 150/130, ratio 1.16; distance genital field-excretory pore 175, genital field-caudal idiosoma margin 250. Gnathosoma vL 138–139; chelicera total L 159; palp ( Fig. 27B View FIGURE 27 ) total L 155, dL/H, dL/H ratio: P-1, 22/17, 1.3; P-2, 43/32, 1.35; P-3, 33/26, 1.27; P-4, 40/18.5, 2.16; P-5, 17/9, 1.87; P-2/P-4 ratio 1.08. Legs: dL of I-L-4–6: 62, 69, 71, I-L-6 H 30, L/H I-L-6 ratio 2.4.

Etymology. The species is named after Epiales (Ancient Greek: Ἐπιάλης), who was a spirit of nightmares. The species name is a noun in apposition (in the nominative case), despite the Recommendation 31A of the ICZN (1999) about avoidance of personal names as nouns in appositions, because there is no case for it being confusing or misleading.

Discussion. Monatractides epiales   n. sp. is rather similar and probably represent a sister species of M. macroporus (K. Viets, 1935)   (see above) with respect to the general shape of idiosoma and palps. Main differences between M. macroporus   and M. epiales   n. sp. are found in the morphology of ejaculatory complex (normallydeveloped with small proximal chamber in M. macroporus   vs. proximal chamber large, proximal and distal arms short, carina anterior short in M. epiales   n. sp. —compare Figs. 26A and -B View FIGURE 26 ). The female assigned to M. epiales   n. sp. can be identified on the basis of a relatively larger extension of the genital field (L ratio genital/idiosoma 0.21).

Habitat. Sandy/bouldery stream, shaded by rain forest

Distribution. Borneo; known only from the locus typicus.