Pseudocrangonyx kseniae Sidorov, 2012

Sidorov, Dmitry A. & Gontcharov, Andrey A., 2013, Studies on subterranean amphipod crustaceans of Primory, Russia. Part 1. Three new species of the genus Pseudocrangonyx from springs and other groundwater habitats in far eastern Russia, Zootaxa 3693 (4), pp. 547-567 : 561

Pseudocrangonyx kseniae Sidorov, 2012

( Figs 3 D, 64–69)

syn.: Pseudocrangonyx kseniae Sidorov, 2012 , p. 30, figs 1–5, (orig. descrip.).

Diagnosis (refined, cf. Sidorov, 2012, p. 31). Small-sized species with marked secondary sexual dimorphism. Dorsal surface of body segments smooth ( Fig. 3 D), teretial, bearing detached fine setae. Eyes absent. Body unpigmented. Interantennal lobe of the head tapered; inferior antennal sinus distinct. Antenna 1 about 50% length of body. Palp mandible article 3 with 2 B-seta, 15 D-setae and 3 E-setae. Ventral surface of pereonites 2–7 with sternal humps (blisters). Pereopod 6 as long as pereopod 7. Urosome without “ecdysial setae”. Uropod 1 with 1 basofacial seta. Inner rami of male uropods 1–2 with serrate setae. Telson entire. Body length 4.2–5.7 mm (females), 4.2 mm (male).

Material examined. Male (4.2 mm, fragment without head part), X38653 /Cr-1469-FEFU, Russia, Primory Territory, Lasovsky District, ~ 3 km E of Laso, Kievka River (43°22.160' N 133°55.485' E), 217 m above sea level, subterranean waters (hyporea), 3 Aug 2009, coll. D.A. Sidorov & K.A. Semenchenko.

Description. Male (4.2 mm, fragment), X38653 /Cr-1469-FEFU, sexually dimorphic characters. Pereon. Coxal plates 1–4 ( Figs 64, 65 ) shallow, sub-rectangular but plate 2 somewhat roundish. Gnathopod 1 ( Fig. 64 ), carpus 0.5× as long as propodus, rastellate setae absent; propodus palm sub-transverse, defining angle distinct, palm with cutting margin crenulated, palm with 4 distally notched robust setae in two rows and 8 distally notched robust setae near defining angle. Gnathopod 2 ( Fig. 65 ), carpus 0.8× as long as propodus, rastellate setae absent; propodus palm sub-transverse, defining angle distinct, palm with cutting margin crenulated, palm with 5 distally notched robust setae in 2 rows and 4 distally notched robust setae near defining angle. Pereopods 3 and 4 with a row of long and short setae on posterior margin; carpus as long as propodus. Pleon. Uropod 1 ( Fig. 66 ): outer ramus armed with 1 robust seta; inner ramus with 1 serrate seta on apex. Uropod 2 ( Fig. 67 ): articles armed with knife-like strong setae; outer ramus armed with 1 robust seta; both rami bearing serrate setae sub-apically and apically. Uropod 3 ( Fig. 68 ): proximal article of outer ramus 2.3× as long as peduncle, bearing 2 sets of setae on lateral margin. Telson ( Fig. 69 ): 1.8× as long as uropod 3 peduncle; 0.3× longer than broad.

Figures

FIGURE 3. (3 A) Pseudocrangonyx tiunovi, sp. nov., from left side, female, 9.0 mm, paratype 11 / 6 sd-IBSS; (3 B) Pseudocrangonyx holsingeri, sp. nov., from left side, female, 3.5 mm, paratype 11 / 7 sd-IBSS; (3 C) Pseudocrangonyx sympatricus, sp. nov., from left side, female, 6.25 mm, holotype X 38655 / Cr- 1471 - FEFU; (3 D) Pseudocrangonyx kseniae Sidorov, 2012, from left side, female, 4.8 mm, paratype 11 / 5 sd-IBSS.

FIGURES 64 – 69. Pseudocrangonyx kseniae Sidorov, 2012, male, 4.2 mm, X 38653 / Cr- 1469 - FEFU: (64) gnathopod 1; (65) gnathopod 2; (66) uropod 1; (67) uropod 2; (68) uropod 3; (69) telson. Scale bars 0.2 mm.