Yichunentulus alpatovi Bu, Potapov & Yin 2014

Adult body length 1200–1350 µm (n=5). Head (Fig. 6A). Ovate, length 120–130 µm, width 70–80 µm. Setae d6 present, sd4 and sd5 short sensilliform. Setae d6 11 µm, d7 10 µm and sd7 18 µm in length. Clypeal pore cp and frontal pore fp present. Pseudoculus round, length 7–8 µm, with short posterior extension, PR=16 (Fig. 6B). Calyx of maxillary gland smooth, without any appendix, blind end split into two leaves, posterior filament 16–17 µm, CF=7–8 (Fig. 6C). Maxillary palpus with two tapering sensilla, dorsal snsillum is evidently longer than lateral one (Fig. 6D). Labial palpus completed, with one-branched terminal tuft of setae, with three setae and one lanceolate basal sensillum (Fig. 6E). Foretarsus (Fig. 6G, H). Length 86–93 µm, claw length 20–23 µm, without inner flap, TR=4; empodium length 4 µm, EU=0.18. Dorsal sensilla t-1 baculiform, t-2 slender and long (23 µm), BS=0.5, t-3 lanceolate. Exterior sensilla a surpassing base of b and c, b slender and short (16 µm), not reaching base of γ3, c reaching base of f and in subequal level to b, d located higher than b and c, e long and reaching base of claw (30 µm), f slender, g broad and short (18 µm). Interior sensilla a’ broad, b’ slender and reaching base of α6, c’ nearly reaching base of claw. Relative length of sensilla: t3 < t1 < b < (a = a’) < g < (b’ = c’) < d < t2 < c < e < f. Setae β1 setiform and δ4 sensilliform. Pores close to sensilla a and t3 present. Length of middle tarsus 40 µm, claw length 17 µm. Length of hind tarsus 45 µm, claw length 20 µm. Thorax. Thoracic chaetotaxy given in Table 3. Setae 1 and 2 on pronotum 20 µm and 12–14 µm length respectively. Mesonotum and metanotum with eight pairs of P-setae, accessory setae short sensilliform, 2 µm in length; setae P1, P1a and P2 on mesonotum 17–20 µm, 3 µm and 20–24 µm respectively. Prosternum with two pairs of anterior seta, and setae A2 and M2 sensilliform. Mesosternum and metasternum each with 7 A-setae, and setae A2 sensilliform. Pronotum and prosternum without pores. Mesonotum with pores sl and al, metanotum with pores sl only. Mesosternum and metasternum each with single median pore, situated anterioral to level of setae M. Adult chaetotaxy of Yichunentulus alpatovi sp. n. Segment Dorsal Ventral Formula Setae Formula Setae Th. I 4 1, 2 (4+4)/6 A1, 2, M1, 2 P1, 2, 3 II–III 6/16 A2, 4, M P1, 1a, 2, 2a, 3, 4, 5, 5a (7+2)/4 Ac, 2, 3, 4, M Pc, 1, 2 Abd. I 6/12 A1, 2, 5 P1, 1a, 2, 2a, 3, 4 3/4 Ac, 2 P1, 2 II–III 6/16 A1, 2, 5 P1, 1a, 2, 2a, 3, 4, 4a, 5 3/5 Ac, 2 Pc, 1a, 2 IV–V 6/16 A1, 2, 5 P1, 1a, 2, 2a, 3, 4, 4a, 5 3/8 Ac, 2 P1, 1a, 2, 3 VI 8/16 A1, 2, 4, 5 P1, 1a, 2, 2a, 3, 4, 4a, 5 3/8 Ac, 2 P1, 1a, 2, 3 VII 8/16 A1, 2, 4, 5 P1, 1a, 2, 2a, 3, 3a, 4, 4a, 5 3/8 Ac, 2 P1, 1a, 2, 3 VIII 6/16 A2, 4, 5 M1, 2, 3, 4, P2, 3, 4, 5 4/2 A1, 2 P1 IX 14 1, 1a, 2, 2a, 3, 3a, 4 4 1, 2 X 12 1, 1a, 2, 2a, 3, 4 4 1, 2 XI 6 1, 3, 4 6 1, 2 XII 9 6 Abdomen. Abdominal chaetotaxy given in Table 3. Tergite I with three pairs of anterior setae (A1, A2, A5). Tergites II–VI with eight pairs of posterior setae. Tergites VI and VII with four pairs of anterior setae (A1, A2, A4, A5). Tergite VII with nine pairs of posterior setae, P3a present. All accessory setae on tergites I–VII short sensilliform, 3 µm on tergites I–V, 4 µm on tergite VI, and 5 µm on VII. Tergite VIII with paired setae M1. Sternite IV–VII each with eight posterior setae, Pc absent. Sternite VIII with two rows of setae (4/2). Tergites I and VIII with pores psm only, II–V with pores psm and al, VI–VII with pores psm, al and psl, IX–XI without pores, XII with single medial pore. Sternites I–IV without pores, V and VI each with 1+1 posterior pores anterior to seta P1 and 1+1 anteromembranal pores, VII with single posterior pore asymmetrical located left or right and 1+1 anteromembranal pores, VIII–XI without pores, XII with 1+1 pores al. Abdominal appendages I, II, III with 2, 1, 1 segments and 4, 2, 2 setae respectively. On appendages II and III, subapical setae 16–17 µm, apical setae 13–14 µm in length. Striate band on abdominal segment VIII reduced, anterior margin regular wave shaped. Comb on abdomen VIII rectangular, with 12–13 teeth (Fig. 6I). Female squama genitalis robust, with moderate basal apodeme and pointed acrostyli (Fig. 6F). Male squama genitalis with 5+5 setae on dorsal side and 3+3 setae on ventral side (Fig. 6J).

Known only from type locality.