Narynia alxaica, Huang, 2025

Huang, Cheng-Wang, 2025, Two new species of the genus Narynia (Collembola, Isotomidae) from China, ZooKeys 1240, pp. 65-72 : 65-72

publication ID	https://doi.org/10.3897/zookeys.1240.141871
DOI	https://doi.org/10.5281/zenodo.15585792
persistent identifier	https://treatment.plazi.org/id/69C2CE12-F7A3-5C5F-8BFA-E2161DB28876
treatment provided by	ZooKeys by Pensoft
scientific name	Narynia alxaica
status	sp. nov.

Treatment

Narynia alxaica sp. nov.

Figs 1 A – E View Figure 1 , 2 A View Figure 2

Type material.

Holotype female • N China, W Inner Mongolia Autonomous Region, Alxa League, Alxa Left Banner , Yaoba , Qianggang range; mixed coniferous broad-leaved forest, moist sandy soil; 3 Aug. 2010; Cheng-Wang Huang and Yun Bu leg. Paratypes • N China, four females, four subadult females and subadult male; W Inner Mongolia Autonomous Region, Alxa League, Alxa Left Banner , Yaoba , Xiazi ravine; moist humus soil in the forest; 4 Aug. 2010; Cheng-Wang Huang and Yun Bu leg. Holotype and paratypes deposited in SEM.

Description.

Size about 1.2 mm. Colour greyish. Integument appears smooth, slightly polygonal under high magnification, without secondary granulation. All body chaetae smooth. Longest macrochaeta on Abd. IV about 0.3 times as long as tergite length.

Antennal length 0.8–0.9 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 24 ordinary chaetae, 1 bms and 1 lateral sensillum. Ant. 3 organ with 2 inner sensilla (small sensory rods) and 2 guard sensilla (Fig. 1 E View Figure 1 ). 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: 2.4.

Ommatidia 8 + 8, G and H smaller, about 0.6 times as long as the diameter of ommatidium A (Fig. 1 A View Figure 1 ). PAO broad, about 2.6 times as long as the adjacent ommatidium and about 1.0 times as long as width of Ant. 1 and 1.1 times as long as inner unguis length, with 2 posterior chaetae. Maxillary palp bifurcate, with 4 sublobal hairs and 1 basal chaeta. Four prelabral chaetae, labral formula as 554. Labium with all papillae A – E present, papilla E with 7 guards, 3 proximal chaetae. 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 / 3, 3, 3, 5 (4 or 6), 3, sometimes with 1 chaeta on center line of Abd. IV. Dorsal chaetotaxy of Abd. V – VI as in Fig. 1 B View Figure 1 . Macrochaetae smooth, 1, 1 / 2, 2, 2, 3, 3 in number. On Abd. I – II Mdl shorter than Ml, on Abd. V Md about 0.6 times as long as tergite length. Macrosensilla on body short and slightly broadened, easily distinguished from ordinary chaetae. Sensillar formula as 33 / 22224 (Fig. 2 A View Figure 2 ). On Abd. I – III macrosensilla positioned just posterior to Mdl. Abd. V with 2 + 2 well-marked, short lateral sensilla (accp 3 and 4) and 2 + 2 medial sensilla (accp 1 and 2), a little thinner and about 1.9 times as long as lateral sensilla. Microsensillar formula as 11 / 11100. Thorax without ventral chaetae. Abd. VI with 10 erect horizontal chaetae at tip.

Claw without inner and lateral teeth. Empodial appendage about half as long as unguis, rather thin. Ti. 1–3 with 21, 21, 22 chaetae respectively, without clavate tenent hairs. Two inner chaetae on Ti. 3 much thinner than others (Fig. 1 D View Figure 1 ). VT with 4 + 4 laterodistal and 4 posterior chaetae, no anterior chaetae. Tenaculum with 3 + 3 teeth and 1 chaeta. Anterior furcal subcoxa with 4 (3 or 5) chaetae, posterior subcoxa with 3 (2 or 4) chaetae. Manubrium without anterior chaetae, posterior with 3 + 3 laterobasal, 2 + 2 in distal transversal row, and 4 + (3) 4 in central part. Dens with 1 anterior and 3 posterior chaetae (Fig. 1 C View Figure 1 ). Mucro massive, bidentate. Ratio of manubrium: dens: mucro = 6.6: 2.5: 1. Female genital plate as in Fig. 1 C View Figure 1 .

Remarks.

Narynia alxaica sp. nov. is similar to Narynia kolimiensis Martynova, 1981 and N. ritongensis sp. nov. They have the same location of the medial sensilla on Abd. I – III, no ventral chaetae on Th. III and the same chaetotaxy of the dens. However, they can easily be distinguished from each other by the location of the medial sensilla on Abd. V. The main differences between the three species are described in the Remarks of N. ritongensis sp. nov.

Distribution.

Known only from the type locality, the foothills of Helan Mountain.

Etymology.

The new species is named after the type locality.