Hygrobates striatus, Smit, Harry & Pešić, Vladimir, 2014

Smit, Harry & Pešić, Vladimir, 2014, Water mites from Mount Kinabalu and the Crocker Range, Borneo, Malaysia (Acari: Hydrachnidia), with the description of 34 new species, Zootaxa 3876 (1), pp. 1-71 : 19-21

Hygrobates striatus n. sp.

( Figs. 10A–F )

Type series. Holotype female, Kipungit River, Poring Hot Springs, Mt Kinabalu, 6º 0 2.776 N 116º 41.432 E, alt. 568 m asl, 15-ix-2012 ( RMNH). Paratype: one female, same data as holotype; one female, Mahua stream downstream of national park entrance, at crossing with national park road, Crocker Range, Borneo, Malaysia, 5º 46.491N 116º 25.770 E, alt. 865 m, 22-ix-2012 (SP); one female, Kemantis stream, Sayap, Mt Kinabalu, Borneo, Malaysia, 6º 0 9.841 N 116º 33.936 E, alt. 928 m asl, 16-ix-2012 ( RMNH; two males, Mahua stream, Mahua, Crocker Range, Borneo, Malaysia, 5º 47.838 N 116º 24.510 E, alt. 1052 m asl, 21-ix-2012 ( RMNH); one male, Mahua stream at crossing with main road, Crocker Range, Borneo, Malaysia, 5º 45.225N 116º 26.085 E, alt. 752 m asl, 22-ix-2012 ( RMNH).

Diagnosis. Idiosoma with a lineation, in tangential view seen as distinct ribbons; P2 with an anteroventral extension with small denticles, P3 with 11–13 denticles; antenniform setae strong and stiff, dgl-4 enlarged.

Description. Integument with a lineation, more dense and regular on venter, more coarse and irregular on dorsum, in tangential view visible as small ribbons. Antenniform setae strong and stiff, dgl-4 distinctly larger than other dg-l. Legs without swimming setae. Suture lines of Cx-III/Cx-IV incomplete.

Female: Colour yellowish, idiosoma dorsally 413 (518–632) long, ventrally 490 (583–680) long, 373 (462–543) wide. A pair of platelets laterally between pre- and postfrontalia. Posteromedial margin of Cx-I+II rounded. Suture lines of Cx-III/Cx-IV incomplete. Genital field 116 long and 66 wide with three pairs of elongated acetabula in triangular position; genital plates almost as long as gonopore, with long setae. Pre-genital sclerite 56 wide, post-genital sclerite 40 wide. Length/height of P1-P5: 42/38, 98/82, 84/62, 138/32, 42/19. P2 with an anteroventral denticulate extension, P3 with 12 (11–13) denticles. Length of I-leg-4–6: 128, 124, 92. Length of IVleg-4–6: 204, 204, 160.

Male: Idiosoma ventrally 653 (502–518) long and 486 (421) wide, dorsally (470–478). Posteromedial margin of Cx-I+II subtriangular. Genital field 130 long and 170 wide, anteriorly indented, acetabula elongated, setae shorter than in female; gonopore 62 long. Length/height of P1-P5: 22/38, 82/70, 74/48, 116/24, 36/16; P2 with a shorter anteroventral denticulate extension compared to holotype female. Length of I-leg-4–6: 98, 100, 84. Length of IV-leg-4–6: 156, 170, 130.

Etymology. Named for the striated integument.

Remarks. Hygrobates limi Wiles, 1991 from mainland Malaysia and H. projectus Wiles, 2004 from Sulawesi have a similar palp, but the acetabula more rounded and the setae of the genital field shorter. Hygrobates projectus is most similar in the striated integument and shape of antenniform setae, but it differs also in the female genital plates which are shorter than the gonopore. Hygrobates henni Wiles, 2004 from Thailand is similar in having elongated acetabula and strong antenniform setae, but differs in a papillose integument and a more narrow anteroventral extension of P2.

The holotype female is a young specimen. The male paratypes and the female paratypes have a shorter anteroventral extension of P2, but are otherwise similar, and are therefore assigned to the new species. The paratype female from the type locality has one normal genital plate and one aberrant genital plate, with the acetabula longer and lying in a different position.

Distribution. Borneo.

Figures

FIGURES 10 A – F. Hygrobates striatus n. sp., holotype female A – D, paratype male E – F. A = dorsal view; B, F = ventral view; C = I-leg- 4 - 6; D = palp; E = palp + capitulum. Scale bars = 50 µm.