Narynia ritongensis, 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.15585794
persistent identifier	https://treatment.plazi.org/id/ACEB3EFE-8D7F-5E6A-BB49-7D4B73652535
treatment provided by	ZooKeys by Pensoft
scientific name	Narynia ritongensis
status	sp. nov.

Treatment

Narynia ritongensis sp. nov.

Figs 2 B View Figure 2 , 3 A – F View Figure 3

Type material.

Holotype female • SW China; Xizang Province, Qamdo, Ritong ; 6 Aug. 2009; Wan-Jun Chen leg. Paratypes • female and subadult male; same data as holotype. Holotype and paratypes deposited in SEM.

Description.

Size 0.9–1.0 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 0.8–1.0 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 22 ordinary chaetae, 1 bms and 1 lateral sensillum. Ant. 3 organ with 2 inner sensilla (small sensory rods) and 2 guard sensilla (Fig. 3 F View Figure 3 ). Ant. 4 with numerous weakly differentiated sensilla, subapical microsensillum and organite present. Apical bulb absent. Ratio of Ant. 1: 2: 3: 4 approximately 1: 1.3: 1.5: 2.2.

Ommatidia 8 + 8, G and H smaller, about 0.6 times as long as the diameter of ommatidium A (Fig. 3 D View Figure 3 ). PAO broad, about 3.4 times as long as the adjacent ommatidium and about 0.9 times as long as width of Ant. 1 and 1.2 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 + (1) 3 postlabial chaetae.

Number of axial chaetae on each side of Th. II – Abd. V: 6, 5 / 3, 3, 3, 4–5, 3, sometimes with 1 chaeta on center line of Abd. IV or V. Dorsal chaetotaxy of Abd. V – VI as in Fig. 3 A, B View Figure 3 . Macrochaetae smooth, 1, 1 / 2, 2, 2, 3, 3 in number. On Abd. I – III 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 B 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 1.6 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, and 24 chaetae, respectively, without clavate tenent hairs. Two inner chaetae on Ti. 3 much thinner than others (Fig. 3 E View Figure 3 ). VT with 4 + 4 laterodistal and 4 posterior chaetae, no anterior chaetae. Tenaculum with 3 + 3 teeth and 1 chaeta. Anterior furcal subcoxa with (3) 4 chaetae, posterior subcoxa with 3 (4) chaetae. Manubrium without anterior chaetae, posterior with 3 + 3 laterobasal, 2 + 2 in distal transversal row, and 2 + 2 in central part. Dens with 1 anterior and 3 posterior chaetae, basal chaeta on posterior side slightly larger (Fig. 3 C View Figure 3 ). Mucro massive, bidentate. Ratio of manubrium: dens: mucro = 6.5: 2.5: 1. Female genital plate as in Fig. 3 C View Figure 3 .

Remarks.

Narynia ritongensis sp. nov. is similar to N. alxaica sp. nov. and N. kolimiensis by the location of medial sensilla on Abd. I – III, no ventral chaetae on Th. III and the same chaetotaxy of the dens. Although N. luanae has 1 + 1 ventral chaetae on Th. III, this species also shares several characteristics with the other three species. The main similarities and differences between the four species of Narynia are listed in Table 1 View Table 1 .

Distribution.

Known only from the type locality.

Etymology.

The new species is named after the type locality.