Chappuisides orientalis, Semenchenko, Ksenia A., 2016

Semenchenko, Ksenia A., 2016, New water mites species (Acariformes: Hydrachnidia) from interstitial waters of the Russian Far East, Zootaxa 4097 (4), pp. 545-556 : 553-555

Chappuisides orientalis sp. n.

( Figs 6 A–H )

Type series. Holotype: male ( X 44822 /Ar-29), Russia, Primory Territory, Artemovsky Urban District, Steklyanukha River, N 43°21.027’; E 132°27.723’; depth 30 cm below the sediment surface; substrate: cobbles, pebbles, coarse- and medium-grained sand; 07.10.2010, leg. K.A. Semenchenko, D.A. Sidorov. Paratypes: 1 female ( X 44857 /Ar-35); 12.06.2010, same locality as holotype; 1 female ( X 44858 /Ar-36), Russia, Primory Territory, Partizansky District, Partizanskay River basin, Tigrovaya River, N 43°11.401’; E 133°12.660’; depth 30 cm below the sediment surface; substrate: cobbles, pebbles, sand; 05.08.2009, leg. K.A. Semenchenko, D.A. Sidorov.

Diagnosis. Adults. Medial edges of Cx-IV slightly separated; setae Pe located in slight indentations of medial edges of Cx-IV at level of suture line between coxal plates III and IV. Genital field in females lying on plates with irregular inner edges, slender (L/W ratio is 1,2–1,3). Setae Pi and Ci located closely on posterior edge of ventral field.

Description. Both sexes. Anterolateral ridges of dorsal shield short, setae Fch, Oi and Si longer than other dorsal setae ( Fig. 4A ; seta Fch visible in Fig. 6C ), setae Fp and Oi not associated with glandularia, other dorsal setae with glandularia. Medial edges of Cx-IV slightly separated; setae Pe located in slight indentations of medial edges of Cx-IV at level of suture line between coxal plates III and IV ( Fig. 6B, C ). Setae Pi and Ci located closely on posterior edge of ventral field on both sides of genital opening (a malformation with all setae Pi and Ci located together below genital opening is illustrated in Fig. 6D ). Gonopore longer than wide, bearing three pairs of genital acetabula; in females lying on plates with irregular inner edges ( Fig. 6C ). Genital plates in males with four pairs of lateral setae ( Fig. 6E ). Ejaculatory complex as illustrated in Figs 6F, G . P-1 ( Fig. 6H ) with one dorsodistal seta; P-2 with two ventral, one medial and two dorsodistal setae; P-3 with one distal seta, two times longer than P-3; P-4 with two short setae: distoventral and distal. Leg segments without expanded flanges distolaterally.

Male. Measurements (n=1). Dorsal shield L 580, W 396; ventral shield L 600; coxal plates L 587, W 134 (one side, midline to tip of condyle at insertion of leg IV); genital field L 94, W 68; ejaculatory complex L 132; pedipalpal segments (P–1–5) L: 14, 46, 22, 57, 25; leg segments L: I–Leg– 1–6—40, 67, 72, 89, 110, 113; II–Leg– 1–6—?,?, 70, 90, 113, 116; III–Leg missed; IV–Leg– 1–6—83, 102, 95, 117, 132, 126.

Female. Measurements (n=2). Dorsal shield L 613–617, W 416–452; ventral shield L 660–682; coxal plates L 614–660, W 145–152 (one side, midline to tip of condyle at insertion of leg IV); genital field L 154–188, W 115– 154; pedipalpal segments (P–1–5) L: 13–14, 50–54, 22–24, 60–62, 20–23; leg segments L: I–Leg– 1–6—35 –47, 54–67, 75–76, 88–92, 111–112, 113–129; II-Leg– 1–6—35 –46, 66–67, 70–72, 86–89, 114–117, 116–130; III-Leg– 1–6—42 –47, 67–71, 70–88, 82–93, 118–119, 113–136; IV-Leg–1–6—102–108, 100–115, 100–102, 118–126, 132–136, 127–129.

Differential diagnosis. Chappuisides orientalis sp. n. is closely related to the North American C. oregonensis Smith, 1992 , decribed on the basis of one male and one female ( Smith 1992). The male of C. oregonensis is a teneral specimen, and was not illustrated, the comparison with it is complicated. The female of the new species differs from the latter in the following characters (character states of C. oregonensis are given in parentheses, data taken from Smith, 1992): genital field slender, L/W ratio 1.2–1.3 (L/W ratio 1), shifted more closely to medial edges of Cx-IV; medial edges of Cx-IV shorter; dorsal shield shorter, 613–617 (690).

Etymology. The species epithet “ orientalis ” is derived from the eastern region where it was collected.

Distribution. Primory Territory, Far East of Russia.

Figures

FIGURE 6 A – H. Chappuisides orientalis sp. n. (A – B, E – H = male holotype, C – D = female paratypes): A. Dorsal shield. B – C. Idiosoma, ventral view. D. Malformation in the location of the setae Pi and Ci. E. Genital field. F – G. Ejaculatory complex, anterior (F) and lateral (G) view. H. Pedipalp, medial view. Scale bars: A – D, H = 100 Μm, E – G = 25 Μm.

FIGURE 4 A – D. Frontipodopsis cuspidata sp. n., A – C—male; D—female: A. Holotype, lateral view. B. Not mounted specimen, dorsal view. C. Not mounted specimen, ventral view. D. Not mounted specimen, genital field. Scale bar = 100 Μm.