Narynia luanae, Huang, Cheng-Wang, Potapov, Mikhail & Gao, Yan, 2010

Huang, Cheng-Wang, Potapov, Mikhail & Gao, Yan, 2010, Taxonomy of the Proisotoma complex. III. A revision of the genus Narynia (Collembola: Isotomidae) with a description of a new species from China, Zootaxa 2410, pp. 45-52 : 49-52

Narynia luanae sp. n.

Figs 15–20 .

Type material. Holotype, female, China, Northwest, Ningxia Province, Jingyuan, Liupan Mountain Nature Reserve, Woyangchuan Forest Farm (35o39'N, 106o23'E; 1762 m alt.), sandy soil and forest litter on the slope of hill, in a valley with stream, 30.VI.2008, leg. Bu Yun and Huang Cheng-Wang ( CAS); Paratypes: 1 female, same data as holotype; 1 subadult female, northwest China, Ningxia Province, Liupan Mountain Nature Reserve, Jingyuan, Qiuqianjia Forest Farm (35o33'N, 106 o24'E; 1841 m alt.), sandy soil, slipped down from a stony cliff near a stream, 6.VII.2008, leg. Bu Yun and Huang Cheng-Wang ( CAS).

Description. Body length: 1010–1050 µm. Colour greyish. Integument appears smooth, slightly polygonal under high magnification, without secondary granulation. All body chaetae smooth. Longest macrochaeta on Abd.IV 0.3 times as long as tergite length.

Antennal length 0.8 times as long as head. Ant.1 with 11 ordinary chaetae, 2 bms (dorsal and ventral) and 2 ventral sensilla, the largest twice as long as the shortest. Ant.2 with 18 ordinary chaetae, 3 bms (dorsal, lateral and ventral) and 1 sensillum. Ant.3 with 1 bms and 1 lateral sensillum. Ant.3 organ with 2 inner sensilla (small sensory rods) and 2 guard sensilla ( Fig. 16 ). Ant.4 with numerous weakly differentiated sensilla, subapical microsensillum and organite present. Apical bulb absent. Ratio of Ant.1: 2: 3: 4 approximately 1: 1.4: 1.4: 2.3.

Ommatidia 8+8, G and H smaller, about 0.6 times as long as the diameter of ommatidium A ( Fig. 18 ). PAO broad, about 2.4 times as long as the adjacent ommatidium and about 0.9 times as long as inner edge of claw, with 2 posterior chaetae. Maxillary palp bifurcate, with 4 sublobal hairs and 1 basal chaeta. Prelabral chaetae 4, labral formula as 554. Labium with all papillae A–E present, papilla E with 7 guards, proximal chaetae 3. Basomedial field of labium with 4 chaetae. Ventral side of head with 3+3 postlabial chaetae.

Number of axial chaetae on each side of Th.II–Abd.V: 5–6, 4–5/4,4,4,4,3. Dorsal chaetotaxy of Abd.V–VI as in Fig. 15 . Macrochaetae smooth, arranged 1,1/2,2,2,3(4),3 on body segments. On Abd.I–III Mdl shorter than Ml. Abd.IV with three macrochaetae (Md, Mdl, Ml), with a less developed anterior macrochaeta (0.6 as long as Mdl). Macrosensilla on body short and slightly broadened, easily distinguished from ordinary chaetae. Sensillar formula: 33/22224 ( Fig. 17 ). On Abd.I–III macrosensilla positioned just posterior to Mdl. Abd.V with 2+2 well marked short lateral sensilla and 2+2 medial sensilla a little thinner and 1.6–2.0 as long as lateral sensilla ( Fig. 15 ). Microsensillar formula: 11/11100. Sternum of Th.I–III with 0+0, 0+0, 1+1 chaetae. Abd.VI with 10 erect horizontal chaetae at tip ( Fig. 15 ).

Claw without inner tooth. Empodium half as long as inner edge of claw, rather thin ( Fig. 19 ). Ti.1–3 with 21, 21, 22 chaetae respectively, without clavate tenent hairs. Two inner chaetae on Ti.3 much thinner than others.

Furca present. Anterior furcal subcoxa with 5(4) chaetae, posterior subcoxa with 3 chaetae. Manubrium with (6)8–9+(6)8–9 posterior chaetae, laterobasal lobe with (2)3 on each side, no anterior chaetae. Mucro massive, bidentate. Dens with 3 posterior and 1 anterior chaeta ( Fig. 20 ). Ratio of manubrium: dens: mucro = 13: 5: 2. Tenaculum with 3+3 teeth and one chaeta. Female genital plate as in Fig. 20 .

Remarks. N. luanae sp.n. can easily be distinguished from other species of the genus by the chaetotaxy of dens, ventral chaetae on Th.III, length of sensilla on Abd.V. The main differences between the four known species of Narynia are listed in the Table 1 .

* Characters require further study of the intraspecific variation.

Distribution. China (Ningxia).

Name derivation. The new species is dedicated to Dr. Luan Yun-Xia, Institute of Plant Physiology & Ecology, Shanghai Institutes for Biological Sciences, for her contribution to our cooperation between China and Russia for Chinese Isotomidae .

Figures

FIGURES 15 – 20. Narynia luanae sp. n.: 15, Abd. V – VI, dorsal view; 16, Ant. 1 – 3, dorsal view; 17, macro- and sensillar chaetotaxy; 18, PAO and ommatidia; 19, tibiotarsus and claw of Leg 3; 20, furcal area and female genital plate.

Tables

TABLE 1. Diagnostic characters of Narynia species.

Character	N. andreevae	N. kolimiensis N. setosa	N. luanae sp.n.
Anterior/posterior chaetae on dens	1–2/4	1/3 2–3 /5	1/3
Posterior chaetae on manubrium*	10+10	8+8–9+9 11+11	(6)8–9+(6)8–9
Ratio dens: mucro*	1.1: 1	2.2: 1 1.3–1.5: 1	2.1–2.5: 1
Ratio empodium: inner edge of claw	2: 3	2: 3 1: 2	1: 2
Ratio PAO: ommatidium	3: 1	3: 1 4–5: 1	2.5: 1
Chaetae on anterior furcal subcoxa*	6	4 6 – 7	(4)5
Teeth on tenaculum	3+3	4+4 3+3	3+3
Ventromedial chaetae on Th.III	1(2)+1(2)	0+0 2–3+2–3	1+1