Oligaphorura wanglangensis Sun & Xie, 2019

Sun, Xin, Shveenkova, Yu. B., Xie, Zhijing & Babenko, A. B., 2019, New Oligaphorura species (Collembola: Onychiuridae) from the forests of East Asia, Zootaxa 4661 (2), pp. 256-270 : 258-260

Oligaphorura wanglangensis Sun & Xie , sp. nov.

Figs 1–12 , Table 2

Type material. Holotype, male, China (Sichuan), Wanglang Natural Reserve, Baixionggou [N 32.9922°, E 104.0069°], 2894 m alt., spruce forest, moss on the stone, 29.07.2017, sample 17WL11, leg. Daoyuan Yu and Yan Qibao.

Paratypes, one female and 2 juveniles, same data as holotype, sample 17WL11; one female and one male, Zhugenchagou [N 32.8822°, E 104.045°], 3058 m alt., spruce forest, moss on the stem, 30.07.2017, sample 17WL12; 2 females and 2 juveniles , 3087 m alt., Zhugenchagou [N 32.8806°, E 104.0436°], spruce forest, moss on the stem, 30.07.2017, sample 17WL13; 1 female and 3 males, Zhugenchagou [N 32.8756°, E 104.0303°], 3141 m alt., spruce forest, litter, 30.07.2017, sample 17WL16. All paratypes are collected from Wanglang Natural Reserve ( China: Sichuan: Pingwu ) by Daoyuan Yu and Yan Qibao. Types are deposited in Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences , Changchun (holotype and 6 paratypes) and in College of Plant Protection , Nanjing Agricultural University, Nanjing (6 paratypes) .

Description. Size 1.1–1.3 mm in females, 0.9–1.2 mm in males; holotype: 1.13 mm. Color white in alcohol, body slender and elongated.

Pseudocellar formulae dorsally: 32/133/33354 with rare asymmetry as 5+4 pso on Abd. IV or 4+3 on Abd. V, ventrally: 11/000/0000 ( Figs 1, 7 , 8 ). Number of ventral psx: 00/000/ 121101 m ( Fig. 7 ). Each upper Sc with one pso and one psx ( Fig. 2 ). Pseudopore formulae dorsally: 00/011/ 111100 ( Fig. 1 ), ventrally: 00/111/000x0 ( Fig. 7 ).

Antennae short and distinctly segmented, as long as head. Length ratio of antennal segments I: II: III: IV= 1: 1.5: 1.5: 2. Ant. IV with two distinctly thickened S-chaetae, subapical organite with globular apex, basolateral ms in line with proximal row of chaetae. AIIIO composed of 5 papillae, 5 guard chaetae, 2 small sensory rods, 2 granulated sensory clubs (internal one almost straight, external clearly larger and bent), and lateral ms ( Figs. 3, 4 ). Ant. I–II with 9–10 and 13–15 chaetae, respectively. Antennal base distinctly marked by granulation ( Fig. 6 ). PAO located in cuticular furrow and built of 3-lobed vesicle, about 3 times larger than nearest pso ( Fig. 6 ). Mandible and maxilla unmodified, typical of genus. Maxillary palp simple with one basal chaeta and 2 sublobals. Labral chaetotic formula 4/342. Labium with 6 proximal, 4 basomedian (E, F, G, f) and 6 basolateral (a, b, c, d, e, e’) chaetae; labial type AC, papillae A–E with 1, 4, 0, 3, and 2 guard chaetae, respectively; among them 6 long and 4 spiniform guards ( Fig. 5 ). Ventral side of head with 4+4 postlabial chaetae along ventral groove ( Fig. 8 ).

Dorsal chaetae poorly differentiated into macro- and microchaetae, symmetrical in general ( Fig. 1 ). S-chaetae cylindrical, well distinguishable, their formulae 11/022/222110 dorsally ( Fig. 1 ), 11/000/000100 ventrally ( Fig. 7 ). Lower Sc of legs I–III with 0, 0, 1 S-chaeta, respectively. Axial cephalic chaetae a0’ and d0 absent, a0 present, 3+3 p-chaetae present between posterior a-pso on head, p 1 set in front of p2 ( Fig. 1 ). Lateral ms present on both Th. II–III, tiny and blunt ( Fig. 1 ). Th. I with 8–10+8–10 dorsal chaetae. Th. II–Abd. III with 3+3 chaetae along axial line, without unpaired axial chaetae ( Fig. 1 ). Abd. IV with one axial chaeta (m0), Abd. V without axial chaetae, Abd. VI with two axial chaetae ( Fig. 1 ). Thoracic sterna I–III with 0+0, 1+1 and 1+1 chaetae, respectively.

Upper Sc of legs I–III with 4, 6 and 5 chaetae, lower Sc with 0, 3 and 4 chaetae, coxae with 2, 9, 14 chaetae, trochanters with 9 chaetae each, femora with 16, 16, 15 chaetae, respectively. Tibiotarsi of legs I–III with 20 (11, 8, 1), 20 (11, 8, 1) and 19 (11, 7, 1) chaetae, respectively ( Figs. 11, 12 ). Unguis without teeth. Unguiculus slender and pointed, 0.6 times as long as inner edge of unguis, with clear basal lamella ( Figs. 11, 12 ). Ventral tube with 8+8 (7+7) distal chaetae, 2–3+2–3 basal chaetae, and with 1+1 anterior chaetae. Furca reduced to finely granulated area with 1+1 axial chaetae posteriorly and further two manubrial rows of chaetae present ( Fig. 7 , 10 ); in other words, furcal area, according to Paśnik & Weiner (2017), with only three rows of chaetae: 4 ma-, 5–6 mm- and 4–5 mpchaetae; dental chaetae absent. Female genital plate with 21–25 chaetae, male genital plate with 20–35 chaetae (preadults) ( Fig. 7 ). Anal valves with following chaetae: a0 and 2a1 on each lateral valve; upper valve with chaetae a0, 2b1, 2b2, c0, 2c1, 2c2 ( Fig. 9 ). Anal spines present on indistinct papillae, 0.8 times as long as inner edge of unguis ( Fig. 1 ).

Etymology. The new species is named after Wanglang Natural Reserve, which main purpose is to protect famous giant panda and its habitats.

Affinities. Oligaphorura wanglangensis sp. nov. is most similar to O. inya (Weiner & Kaprus’, 2014) described from the Altai mountains, Russia. These two species share many important diagnostic characters such as furcal field with a finely granulated area and 1+1 posterior setae, identical dorsal, ventral and subcoxal pso formulae (32/133/33354, 2/000/00000 and 1-1-1, respectively), five papillae in AIIIO, labium of AC type, lateral ms on both Th. II–III, a complete distal whorl of chaetae on tibiotarsi and developed anal spines on Abd. VI. However, they can be distinguished by body size (0.9–1.3 mm in O. wanglangensis sp. nov. vs 0.7–0.84 in O. inya ), ventral psx formulae (00/000/ 121101 m in the new species vs 1/000/ 212101 m in O. inya ), the number of dorsal S-chaetae (11/022/ 222110 in the new species vs 11/011/ 222111 in O. inya ), and relative size of PAO (3 times larger than the nearest pso vs 1.6–1.7 as long as pso in O. inya ).

Among species recorded in the region under consideration O. wanglangensis sp. nov. can also be compared with two other Chinese species, i.e. O. sanjiangensis (Sun & Wu, 2012; in: Sun & Wu 2012a) and O. jingyueensis (Sun & Wu, 2012; in: Sun & Wu 2012c). All these species are characterized by the same number of ventral and subcoxal pso, a similar shape of AIIIO, as well as by the presence of lateral ms on both Th. II–III and identical furcal remnant having similar chaetotaxy. Nevertheless, other important characters including different numbers of dorsal pso (see key) permit their reliable identification.

Distribution and ecology. The species is so far known only from the spruce forests of southwest China, inhabiting litter and mosses on the trunks there.

Figures

FIGURES 1–7. Oligaphorura wanglangensis sp. nov.: 1, dorsal chaetotaxy; 2, upper subcoxae of legs I–III; 3, antenna; 4, papillae and sensorial elements of AIIIO; 5, labial palp; 6, PAO and pso at antennal base; 7, ventral chaetotaxy of abdomen. Scales: Figs 1–3, 7—0.1 mm, 4–6—0.01 mm.

FIGURES 8–12. Oligaphorura wanglangensis sp. nov.: 8, ventral chaetotaxy of head; 9, chaetotaxy of anal valves; 10, sternum of Abd. IV; 11, tip of leg I; 12, ibid., leg III. Scales: Figs 8–12—0.1 mm.