Heptacanthella yinae Gao & Potapov & Bu 2022, sp. nov.
Creators: name: Gao, Yan
name: Potapov, Mikhail
name: Bu, Yun
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Collembola
Entomobryomorpha
Isotomidae
Heptacanthella
Heptacanthella yinae

description: 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).
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.
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).
description: Published as part of Gao, Yan, Potapov, Mikhail & Bu, Yun, 2022, A new blind genus of Anurophorinae (Collembola: Isotomidae) with seven anal spines from Northwest China, pp. 80-88 in Zootaxa 5104 (1) on pages 82-86, DOI: 10.11646/zootaxa.5104.1.4, http://zenodo.org/record/6258051