Vietnura Deharveng & Bedos, 2000: new record to China

Jiang, Ji-Gang, Huang, Cheng-Wang & Luan, Yun-Xia, 2018, A new species of Lobellina and first record of Vietnura from China (Collembola: Neanuridae: Neanurinae), ZooKeys 807, pp. 13-28 : 22-25

Genus Vietnura Deharveng & Bedos, 2000: new record to China

Vietnura caerulea Deharveng & Bedos, 2000: 209-214, figs 1-4 (Vietnam) new record to China

Material.

Two males on the same slide, one of them submature, 25°17.453'N, 107°56.359'E, elevation 880-900 m. Three individuals in alcohol, Coordinates: 25°17.516'N, 107°56.371'E, elevation 840 m. One specimen in alcohol, 25°17.483'N, 107°56.245'E, elevation 731 m. All of them were collected by Cheng-Wang Huang, Yan Liang & Ai-Min Liu, from Maolan National Nature Reserve, Libo County, Guizhou Province, China, on 19 July 2015. Material deposited in Shanghai Entomological Museum, Chinese Academy of Sciences.

Description of the Chinese specimens

(Figs 10-15, Tables 5-7). Body length (without antenna) 0.9-1.1 mm. Cuticular granulations medium, tertiary granules developed, body with reticulations. Tubercles well developed on dorsal side of body. Body color blue alive and in alcohol. Eyes 2+2, small and pigmented, all on tubercles Oc. Chaetal morphology (Fig. 14). Dorsal ordinary chaetae of four types: Ml, Mc, Mcc, and me. Macrochaetae Ml long, sheathed, distinctly toothed and knobbed at apex (Fig. 14a). Macrochaetae Mc morphologically similar to long macrochae tae, but shorter. Macrochaetae Mcc morphologically similar to Mc and shorter than Mc. Mesochaetae similar to ventral chaetae, thin, smooth, and pointed, with various lengths. S-chaetae of tergites thin, smooth, shorter than Mc and slightly longer than Mcc “mou” (Fig. 14b). S-chaetae formula on tergites as 0, 2+ms, 2/1, 1, 1, 1, 1. Antenna. Antenna 4-segmented. Ant. I with seven chaetae. Ant. II with 10-11 chaetae. Ant. III dorsally fused to Ant. IV. AOIII consists of two short rods, one ventral ms and two longer sensilla (sgd and sgv), sgd shifted basally to the back of the two rods, each rod exposed in separate pit (Fig. 10). Ant. IV dorsally with eight sensilla, slender i-chaeta, and minute capitate organite (or), apical bulb small, trilobed (Fig. 10). Sensilla thicker and shorter than “mou” -chaetae (Fig. 10). Ventral chaetotaxy of Ant. III–IV as in Fig. 11 and Table 6, group ap with seven bs and four miA, ca with two bs and two miA, cm with three bs and one miA, cp with eight miA and brs5. On ventral side of Ant. III, Vi, Vc, Ve respectively with four, four, three chaetae; dorsally with three d chaetae, d3 as mesochaeta (Fig. 10). Mouthparts. Buccal cone short, labral sclerifications not ogival. Labrum chaetotaxy:?/2, 4. Labium with four basal, three distal, four lateral chaetae, without papillae x. Maxilla reduced, styliform (Fig. 13). Mandible reduced, tridentate (Fig. 12).

Dorsal chaetotaxy and tubercles (Table 7). Head with six tubercles. Tubercle Cl with four chaetae: two G and two F; tubercle Af+Oc with four chaetae: two B and two Ocm, chaeta O absent; tubercle Di+De with four chaetae: two Di1, two De1; tubercle Dl+L+So with eleven chaetae (5Ml+6me). Thorax and abdomen tubercles and chaetotaxy as in Table 7. Cryptopygy.

Ventral chaetotaxy (Fig. 15 and Table 5). On head, groups Vea, Vem and Vep with two, two, two chaetae respectively. Group Vi on head with five chaetae. VT with one proximal and three distal chaetae. On Abd. III, furca rudimentary with 3-4 chaetae, Vel with 3-4 chaetae. On Abd. IV, group Vei, Vec, Vel respectively with one, two, three chaetae, Vl with three or four chaetae. On Abd. V, group Vl with two chaetae, chaeta L’ absent, Ag with two chaetae. Anal lobe with twelve chaetae and one mi.

Appendages. Unguis without tooth. Chaeta M on tibiotarsus present. Tibiotarsus of foreleg, midleg and hindleg, respectively with 19, 19, 18 chaetae. Chaetotaxy of ventral tube and furcular remnant as in Table 7.

Ecology and distribution.

Among fallen leaves of bamboo and under broad-leaved trees in the forest. The species is described from Vietnam. In China, it is only known from Maolan National Nature Reserve, Libo County (Fig. 16).

Remarks.

Vietnura caerulea is easily distinguished among Chinese Neanurinae by its blue body color, six tubercles on the head, 2+2 pigmented eyes on tubercle Af+Oc, and reduced mandible and maxilla. Additionally, Ve chaetal group of Abd. IV has 3-5 shortened, thickened, and distally ciliated chaetae (male), claw is toothless, and hypotrichosis is developed on body tubercles.