Nilotonia (Dartiella) longiseta, Smit & Pesic, 2010

Smit, H. & Pesic, V., 2010, New Species Of Water Mites From Oman, With Some Zoogeographical Notes (Acari: Hydrachnidia), Acarologia 50 (2), pp. 151-195 : 154-157

Nilotonia (Dartiella) longiseta n. sp.

( Figures 3 A-G)

Type series — Holotype male (idiosoma in fluid, palp, first and fourth leg mounted), stream Hatta pools, Oman, 24°41.165 N 56°09.556 E, 15-xi-2008, alt. 421 m ( ZMAN) . Paratypes: 0/5/0, same data as holotype; 0/1/0, stream Wadi Ghul , Oman, 23°10.297 N 57°11.996 E, 12-xi-2008, alt. 805 m ; 0/1/0, unnamed stream crossing road to Al Fay , near Ray, Oman, 24°38.709 N 56°06.760 E, 15-xi- 2008, alt. 562 m ; 2/0/0, Pools Wadi Bani Auf , Oman, 23°13.464 N 57°25.083 E, 13-xi-2008, alt. 655 m.

Diagnosis — Male with a large area (L 106, W 104) of secondary sclerotization posterior to genital field; secondary sclerotization in female posterior to genital field smaller; pregenital sclerite of female extended anteriorly; setae of D2 and D3 long, posterior dorsal plate large.

Description

Male — Idiosoma soft, dorsally L 551 (530-591), W 389 (421-429), ventrally L 608 (559-664). Dorsum with one large, posterior plate, L 160 (180- 218), W 112 (130-148). Setae of glandularia D2 and D3 (sensu Wiles, 1997a) long. Cx-I separated medially, with triangular apodemes; Cx-I posteriorly with narrow secondary sclerotization. Cx-III with a blunt corner medially, anteriorly of genital field. Genital field ( Fig. 3E ) with three pairs of elongated acetabula, L 106, W 76. Pregenital sclerite large, bowed, posteriorly of genital field a somewhat triangular secondary sclerotization. Chelicere L 247, cheliceral claw L 74. Palp ( Fig. 3F ): total L 316; L: P- 1, 22; P-2, 96; P-3, 62; P-4, 108; P-5, 28; P-2 with a 72 long ventral seta, which is inserted somewhat medially; ventral margin of P-2 distally with 5-6 denticles of variable size; P-3 with a long medial seta which extends beyond posterior margin of P-4; P-4 with a short setal tubercle, ventral margin with three setae various in length, of which the seta on the setal tubercle is the longest. L of I-Leg-4-6: 101, 126, 96. I- Leg-4 with four heavy distal setae, two longer, two shorter ( Fig. 3C ). L of IV-Leg-4-6: 178, 202, 182. IV- Leg-6 with a 90 long distal seta. IV-Leg-5 with three heavy distal setae, at least the longest of these serrated. IV-Leg-4 with five heavy distal setae, some of these (or all?) serrated. Claws of legs I-III with a comb and a clawlet. Excretory pore smooth.

Female — Idiosoma soft, dorsally L 656 (559- 802), W 502 (421-591), ventrally L 713 (616-850). Dorsum with one large, posterior plate, L 194 (150- 196), W 124 (106-128), and a pair of smaller more anteriorly located plates. Setae of glandularia D2 and D3 (sensu Wiles, 1997a) long. Cx-I separated medially, with triangular apodemes; Cx-I posteriorly with narrow secondary sclerotization. Cx-III with a blunt corner medially, anteriorly of genital field. Chelicerae of mounted female not measurable. Genital field with three pairs of elongated acetabula, L 146, W 82. Pregenital sclerite larger and more extended anteriorly compared to male ( Fig. 3D ). Secondary sclerotization posterior to genital field as in male, but shorter. Palp: total L 420; L: P-1, 32; P-2, 136; P-3, 78; P-4, 140; P-5, 34; palp as in male, but ventral margin of P-2 with numerous (15-20) denticles. L of I-Leg-4-6: 120, 140, 104. L of IV-Leg-4-6: 206, 244, 236. Distal seta of IV-Leg-6 100 long. Legs as in male. Excretory pore smooth.

Etymology — Named after the long setae on the dorsum.

Remarks — The combination of long setae of D2 and D3, the typical shape of the female pregenital sclerite and a large dorsal plate separates this species from other Nilotonia species.

Figures

FIGURE 3: Nilotonia longiseta n. sp. (A-C, E-G: male, D: female): (A) – idiosoma, dorsal view; (B) – idiosoma, ventral view; (C) – I-Leg-4-6; (D-E) – genital field; (F) – palp; (G) – IV-Leg-4-6. Scale bars = 200 µm (A-B), 50 µm (C-G).