Siamaxonopsis ypsilon, Smit, 2016

Smit, H., 2016, The water mite family Aturidae Thor, 1900 from Southeast Asia (Acari: Hydrachnidia) with the description of one new genus and 14 new species, Acarologia 56 (3), pp. 341-365 : 360

Siamaxonopsis ypsilon n. sp.

( Figure 13 )

Material examined — Holotype female, Stream near Haewsai Waterfall, Nam Nao NP, Thailand, 16°40.668N 101°41.856E, alt. 425 m a.s.l., 16-xi-2007.

Diagnosis — As for genus.

Description — Female: Idiosoma dorsally 365 long and 285 wide, ventrally 356 long. Dorsal shield 259 wide, with two Y-shaped structures. Genital field with 16 pairs of acetabula, most acetabula ellipsoid, but more rounded acetabula do occur as well. Cxgl-2 lateral of genital field, but not visible in ventral view. Length of P1-5: 24, 42, 26, 56, 30. P2 with a somewhat medially located large noseshaped extension, P4 stocky and bulging ventrally. Length of I-leg-4-6: 42, 46, 52. Length of IV-leg-4-6: 60, 70, 64. Legs simple, claws with ventral clawlet. Swimming setae: III-leg-4 two, III-leg-5 three, IVleg-4 two, IV-leg-5 three. Male: Unknown.

Etymology — Named for the Y-shaped structures on the dorsum.

Figures

FIGURE 13: Siamaxonopsis ypsilon n. sp., holotype female: A – dorsum; B – venter; C – posteromedial view of genital field and posterior margin of dorsal shield; D – palp. Scale bars = 50 µm.