Nilotonia (Nilotonia) palustris, Smit, 2017

Smit, Harry, 2017, New records of water mites from standing waters in Thailand, with the description of nine new species (Acari: Hydrachnidia), Zootaxa 4312 (1), pp. 69-91 : 71

Nilotonia (Nilotonia) palustris n. sp.

( Fig. 2 )

Material examined. Holotype male, swamp Kaeng Leang Chan , Maha Sarakham Province, 16° 11.469ʹ N, 103° 12.413ʹ E, 2-xi-2016.

Diagnosis. Male with a large plate posteriorly to genital field; posteriorly to fourth coxae a large area of somewhat rhomboid sclerotization; IV-leg-6 without terminal seta; third and fourth leg with swimming setae. The narrow genital plates in combination with the characters above are diagnostic for male of the species.

Description. Male: Idiosoma length 729; width 672. Dorsum mostly unsclerotized. Dorsum anteriorly with a pair of small platelets: length 60; width 46, each with a seta, and located anterior to a single larger posterior platelet: length 148, width 102. Venter with coxae in four groups; Cx-I separate medially; Cx-IV with a large area of sclerotization extending posteriorly beyond the genital field; A large plate, 332 wide located behind the genital plates and anteriorly between Cx-IV area of secondary sclerotization. Genital field: 170 long, with 110, with three pairs of elongate acetabula; length P1–5:19, 99, 44, 109, 17; P2 with three dorsal setae and on the ventral margin a short seta located on a tiny hump. Length: I-leg-4–6: 116, 150, 156; IV-leg-4–6: 134, 160, 196; IV-leg-6 without large terminal seta, only two minute setae are present; IV-leg-5 with 12 ventral setae. Numbers of swimming setae: III-leg-4: 1, III-leg-5: 2, IV-leg-3–5: 6.

Female: Unknown.

Etymology. Named for its occurrence in a swamp.

Remarks. Only two species are known in the Oriental region of the subgenus Nilotonia (Panesar 2004) . Both species lack the large plate posteriorly to the genital field.

Figures

FIGURE 2. Nilotonia palustris n. sp., holotype male. A = dorsum; B = venter; C = left and right palp; D = IV-leg- 4 – 6. Scale bars: A – B = 200 µm, C – D = 50 µm.