A new blind genus of Anurophorinae (Collembola: Isotomidae) with seven anal spines from Northwest China Author Gao, Yan 0000-0003-0305-3696 Natural History Research Center, Shanghai NaturalHistory Museum, Shanghai Science & Technology Museum, Shanghai 200041, China gaoy@sstm.org.cn Author Potapov, Mikhail 0000-0002-6111-3354 Moscow State Pedagogical University, Kibalchich str., 6, korp. 3, Moscow 129278, Russia. mpnk@yandex.ru Author Bu, Yun 0000-0002-7177-9686 Natural History Research Center, Shanghai NaturalHistory Museum, Shanghai Science & Technology Museum, Shanghai 200041, China buy@sstm.org.cn text Zootaxa 2022 2022-02-24 5104 1 80 88 journal article 10.11646/zootaxa.5104.1.4 1175-5326 6258051 2A1CF95E-B7DF-47E4-9F8B-37ABEA6A05F7 Heptacanthella yinae sp. nov. Figures 1–21 Material examined . Holotype : female (slide No. XJ-C2016086 ) ( SNHM ), Northwest China , Xinjiang Province , Bole city, Hariturege Park , 45°08’N 81°46’E , 1125 m alt., soil samples from the forest of Populus euphratica , 31- VIII-2016 , collected by Cheng-Wang Huang. Paratypes : 10 females (slide Nos. XJ-C2016085 , XJ-C2016087 , XJ- C2016094, XJ-C2016099 – XJ-C2016101 ) , 8 males (slide Nos. XJ-C2016088 – XJ-C2016093 , XJ-C2016102 , XJ- C2016103), same data as holotype . Non-type specimens: 1 juvenile ( Slide No. XJ-C2016104 ), same data as holotype . Holotype and most paratypes are deposited in Shanghai Natural History Museum ( SNHM ), 1 female ( XJ-C2016099 ) and 1 male ( XJ-C2016103 ) paratypes are deposited in Shanghai Entomological Museum ( SEM ), 1 female (XJ- C2016085) and 1 male ( XJ-C2016093 ) paratypes are deposited in Moscow State Pedagogical University ( MSPU ) . FIGURES 1–10. Heptacanthella yinae sp. nov. 1, habitus; 2, head, dorsal view; 3, head ventral view; 4, Ant. I and II, ventral view; 5, Ant. III, dorsal view; 6, subapical part of Ant. IV, dorsal view, focusing on subapical micro s-seta and organite; 7, Ant. IV, focusing on one of thicker s-seta; 8, ventral tube, lateral view; 9, leg 3; 10, anterolateral head, show postantennal organ on right side. ms—ms-setae; s—s-setae; bms—basal ms; org—organite; PAO—postantennal organ. FIGURES 11–14. Heptacanthella yinae sp. nov. 11, Ant. III and IV, dorsal view (7 thick s-setae marked); 12, Ant. I and II, ventral view; 13, Abd. V–VI, dorso-lateral view; 14, s-, ms-setae, and macrosetae on boby tergites. ms—ms-setae; s—s-setae; bms—basal ms; Md—dorsal macrosetae; org—organite. FIGURES 15–23. Heptacanthella yinae sp. nov. 15, Th. II–III, dorso-lateral view; 16, 17, lateral part of Th. II (16) and Th. III (17); 18, Abd. I–II, left side; 19, Abd III– IV, left side; 20, Abd. V–VI, dorso-lateral view; 21, Abd. III, left side, amplified view; 22, ventral side of Abd. III; 23, ventral side of Abd. IV. Md, Mdl, Ml—dorsal, dorso-lateral and lateral macrosetae; ms—mssetae; s—s-setae; m—middle setae; p—posterior setae. Description . Body slender ( Fig. 1 ), females 1.15 mm long on average (1.1–1.2 mm, n=11), males 0.93 mm (0.86–1.0 mm, n=8), holotype 1.12 mm. Pigmentation and eyes absent ( Fig. 2 ). Cuticle reticulated ( Figs 10 , 16 ). PAO extremely narrow, weakly constricted medially ( Figs 2, 10 ), 33–40 μm long and 3–4 μm wide, 1.5–1.6 times as long as claw 3 (20–26 μm). Head with short dorsal setae, a0 seta 10–11 μm long ( Fig. 2 ). Labral formula as 4/554. Labium with complete set of components. Ventral side of head as shown in Fig. 3 . Inner mouth parts heavily sclerotised. Antenna (160–185 μm) slightly shorter than head (175–200 μm). Ant. I with 11 setae, 2 ventral s (longer one 7–10 μm and shorter one 4–5 μm), 1 dorsal and 1 ventral bms (3 μm) ( Figs 4 , 12 ). Ant. II with 15–16 setae, 3 bms (4 μm) and 1 curved medial lateral s (7–10 μm) ( Figs 4 , 12 ). Ant. III with 21–22 setae, 2 slender s (8–10 μm), 2 short s (3–4 μm), 1 slender lateral s (5–6 μm) and 1 dorsal bms ( Figs 5 , 11 ). Ant. IV with 7 thicker s-setae, 8 slender s-setae, 1 organit, 1 subapical micro s-seta, and numerous ordinary setae ( Figs 6, 7 , 11 ). Length ratio of antennal segments as 1: 1.7–2.0: 1.5–1.6: 2.6–2.8. Ordinary setae and s-setae on body well differentiated ( Figs 13–21 ). Tergal s-setae on Th. II–Abd. IV distinctly shorter than ordinary setae ( Figs 14 , 15–19 ). S-setae thin and short. S- and ms-setae formula 33/22224 (s), 10/001 (ms) ( Figs 14–21 ). Thorax: Th. II and III each with 1 dorsal medial s and 2 anterolateral s, 6–8 μm, and 1 ms (4–5 μm) present on Th. II only ( Figs 14–17 ). Abdomen: Abd. I–IV each with 1 dorsal medial s (8–11 μm) and lateral s (6–9 μm), and 1 ms (5–6 μm) present on Abd. III ( Figs 14 , 18, 19, 21 ). Abd. V with two slender and long medial s-setae (10–12 μm) and two rod-like lateral s-setae (8–10 μm) ( Figs 13, 14 , 24, 26 ). Macrochaetotaxy 1, 1 / 2, 2, 3, 3 ( Figs 14–15, 18–19 ). Macrosetae 50–70 μm long. Axial setae on Th. II–Abd. IV as 10(12), 8 / 6, 6, 6, 8 ( Figs 14–15, 18–19 ). Ml macroseta (55–70 μm) on Th. II 3.3–4.0 times as long as p1 seta (17–21 μm) ( Fig. 16 ). Sterna of Th. I–III without setae. FIGURES 24–27. Heptacanthella yinae sp. nov. ventral side of Abd. V–VI in holotype (24) (subadult female), paratype XJ- C2016095 (25) (adult female), paratype XJ-C2016088 (26) and paratype XJ-C2016093 (27). s—s-setae. Ventral tube with 3+3 laterodistal and 4 posterior setae in one transversal row ( Fig. 8 ). Claw of normal shape ( Fig. 9 ), 20–25 μm long, without inner and lateral teeth. Unguiculus simple, without lamella, 7–10 μm long, 0.3–0.5 as long as claw 3 ( Fig. 9 ). Tibiotarsus I–III with 21, 21, 22 setae respectively, without additional setae. Tibiotarsus without clavate tenent setae ( Fig. 9 ). Furca and tenaculum completely absent. Retinacular field without setae ( Fig. 22 ). Furcal subcoxa with 6+6 or 6+7 setae, including two macrosetae (45–50 μm) in medio-lateral position ( Fig. 23 ). Manubrial field with 5–6 setae ( Fig. 23 ). Abd. V with 4 short spines (p1 and p2) arranged in one transverse row, equal in length, 15–18 μm ( Figs 13–14 , 20 ). Abd. VI with 3 strongly chitinised, robust spines (m0 and m1), middle spine (35–38 μm) longer than 2 lateral ones (25–30 μm) ( Figs 13–14 , 20 ). All spines set on large papillae. Female genital plate with 3 pairs of circumgenital setae and 2+2 sensilliform eugenital setae ( Figs 24, 25 ). Male genital plate of juvenile specimens with 9–13 minute circumgenital setae ( Figs 26, 27 ). Etymology. The new species is dedicated to Professor Wenying Yin for her contribution to the knowledge of soil fauna from China , and to express our great gratitude for her instructions. Distribution. Known only from the type locality in Xinjiang province (NW China ) ( Fig. 28 ).