Pseudocrangonyx kseniae Sidorov, 2012

Pseudocrangonyx kseniae Sidorov, 2012 View in CoL

( Figs 3 View FIGURE 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 View FIGURE 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 View Materials /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 View Materials /Cr-1469-FEFU, sexually dimorphic characters. Pereon. Coxal plates 1–4 ( Figs 64, 65 View FIGURES 64 – 69 ) shallow, sub-rectangular but plate 2 somewhat roundish. Gnathopod 1 ( Fig. 64 View FIGURES 64 – 69 ), 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 View FIGURES 64 – 69 ), 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 View FIGURES 64 – 69 ): outer ramus armed with 1 robust seta; inner ramus with 1 serrate seta on apex. Uropod 2 ( Fig. 67 View FIGURES 64 – 69 ): 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 View FIGURES 64 – 69 ): proximal article of outer ramus 2.3× as long as peduncle, bearing 2 sets of setae on lateral margin. Telson ( Fig. 69 View FIGURES 64 – 69 ): 1.8× as long as uropod 3 peduncle; 0.3× longer than broad.