Lobellina yinae, Jiang, Ji-Gang, Huang, Cheng-Wang & Luan, Yun-Xia, 2018

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 : 16-21

Lobellina yinae sp. n. Figs 1, 2, 3, 4-9, Tables 1, 2, 3, 4

Material.

Holotype, male, on slide. Maolan National Nature Reserve, Libo County, Guizhou Province, China. 25°16.400'N, 107°53.864'E, ca. 780 m above sea level, 22 July 2015. Collected by Cheng-Wang Huang, Yan Liang and Ai-Min Liu. Paratype, one subadult, same slide and data as holotype.

Etymology.

The species is named after Prof. Wen-Ying Yin, in honor of her important contributions to the study of Chinese soil animals.

Diagnosis.

Three pigmented eyes, mandible with six teeth, cephalic chaeta O present and free from tubercle Fr, cephalic tubercle Oc with three chaetae, cephalic tubercle Di separate, tubercle Dl with four (sometimes three) chaetae, Ant. I with eight chaetae, and claw with single inner tooth.

Description.

General (Figs 1-3). Body length (without antenna) 1.8-2.1 mm. Cuticular granulations medium, tertiary granules absent, body without reticulations. Tubercles well developed on dorsal side of body. Body color red when alive, white in alcohol. Eyes 3+3, pigmented (Fig. 1). Chaetal morphology (Fig. 9). Dorsal ordinary chaetae of five types: Ml, Mc, Mcc, me, and mi. Macrochaetae Ml long, sheathed, weakly toothed and knobbed at apex. Macrochaetae Mc morphologically of two types: one is similar to Ml, but shorter, the other one with slightly pointed apex. Macrochaetae Mcc morphologically similar to Ml and shorter than Mc. Mesochaetae similar to ventral chaetae, thin, smooth, and pointed, with various length. Microchaetae shorter than mesochaetae, with acuminate tip. S-chaetae on terga thin, smooth, shorter than Mc, longer than Mcc. Antenna (Fig. 4 and Table 3). Antenna 4-segmented. Ant. I with eight chaetae. Ant. II with eleven chaetae and dorsally with a smooth circular area. Ant. III dorsally fused to Ant. IV. AOIII consists of two short rods, ventral ms and two longer sensory chaetae (sgd and sgv), sgd on the same level position of the two rods, each rod exposed in separate pit. Ant. IV dorsally with eight thickened and blunt sensilla, slender i-chaeta, and minute capitate organite (or). Apical bulb distinct, trilobed. Each of the eight sensilla distinctly differentiated, larger and two times shorter than “mou” -chaetae. Ventral chaetotaxy of Ant. III–IV is shown in Table 3, ap with eight bs and three miA, ca with two bs and two miA, cm with three bs and one miA, cp with six bs and seven miA. On ventral side of Ant. III, Vi, Vc, Ve respectively with four, four, five chaetae, Ant. III dorsally with 4-5 d chaetae, d1, d2, d3 as me, d4 as mi, d5 as mi and sometimes absent. Mouthparts. Buccal cone moderately long, labrum ventral sclerifications truncated (Fig. 8). Labrum chaetotaxy: 0/2, 2. Labium with normal chaetotaxy, and chaeta F almost three times as long as chaeta A, without papillae x (Fig. 8). Maxilla styliform, consisting of two fused lamellae, apically with two tiny teeth (Fig. 7). Mandible with four apical teeth, one middle tooth, and one large basal tooth (Fig. 6). Dorsal chaetotaxy and tubercles of head (Fig. 1 and Table 1). Head with 14 tubercles. Tubercle Cl with four chaetae: 2G+2F; tubercle An with four chaetae: B, C, D, E; tubercle Oc with three chaetae; tubercle Fr with three chaetae, chaeta O present, shifting between the two tubercles An; tubercle Di with a single chaeta; De with three chaetae; tubercle Dl separate from tubercle L+So, with four (or three) chaetae; tubercle L+So with 13 chaetae. Dorsal chaetotaxy and tubercles of thorax (Fig. 2 and Table 4). Thoracic dorsal tubercles complete. Th. I with three tubercles, tubercle Di with one chaeta; tubercle De with two chaetae; tubercle Dl with one chaeta. Th. II with four tubercles, tubercle Di with three chaetae; tubercle De with five chaetae (4+s); tubercle Dl with five chaetae and one ms (4+s+ms); tubercle L with three chaetae. Th. III with four tubercles, tubercle Di with three chaetae; tubercle De with five chaetae (4+s); tubercle Dl with five chaetae (4+s); tubercle L with three chaetae. Dorsal chaetotaxy and tubercles of abdomen (Fig. 3 and Table 4). Dorsum of Abd. I with four tubercles, tubercle Di with two chaetae; tubercle De with four chaetae (3+s); tubercle Dl with three chaetae; tubercle L with four chaetae. Tubercles and chaetae arrangements of Abd. II–III as on Abd. I. Abd. IV with four tubercles, tubercle Di with two chaetae; tubercle De with three chaetae (2+s); tubercle Dl with three chaetae; tubercle L with 5-7 chaetae. Abd. V with four tubercles, tubercle Di with three chaetae; tubercle De with one chaeta (s); tubercle Dl with four chaetae; tubercle L with seven chaetae (without s chaeta). Abd. VI bilobed, each side of Abd. VI with one tubercle, each tubercle with seven chaetae. No cryptopygy. S-chaetae formula on tergites as 0, 2+ms, 2/1, 1, 1, 1, 1. Ventral chaetotaxy (Fig. 5, Table 2). On ventral side of head, groups Vea, Vem, and Vep with five, four, four chaetae respectively. Group Vi on head with five chaetae. On Abd. I, VT with one proximal and three distal chaetae. On Abd. III, furca rudimentary with three chaetae, and without microchaeta. On Abd IV, group Vei, Vec, Vel respectively with one, two, four chaetae. On Abd. V, group Vl with 2-3 chaetae, Ag with 3-4 chaetae, chaeta L’ absent. Anal lobe with 14-15 chaetae and three mi. Legs (Table 4). Unguis with an inner tooth and without lateral tooth. Chaeta M on tibiotarsus present. Tibiotarsus of foreleg, midleg, and hindleg with 19, 19, 18 chaetae respectively.

Ecology and distribution.

In fallen leaves of bamboo. Lobellina yinae sp. n. is only known from Libo (Fig. 16).

Remarks.

To date, 15 species of the genus Lobellina are known from Asia and one from Central America (Cuba) ( Deharveng and Weiner 1984, Ma and Chen 2008, Smolis 2017, Jiang et al. 2018). The new species is similar to L. montana Deharveng & amp; Weiner, 1984 and L. paraminuta Deharveng & Weiner, 1984 from Korea by the following characters: cephalic chaeta O free from tubercle Fr (shifting between two tubercles An), cephalic tubercle Dl separate from tubercle L+So, tubercle Oc with three chaetae, Abd. V with 3+3 dorsal tubercles and De separate from Dl, and claw with a distinct basal inner tooth. However, L. yinae sp. n. can be distinguished from L. montana and L. paraminuta by its mandible with six teeth versus seven, cephalic tubercle Dl with three or four chaetae versus five, tubercle De on Abd. I–III with four chaetae (3+s) versus three (2+s), and tubercle Dl on Abd. I–III with three chaetae versus two.

The new species is also similar to L. fusa Jiang, Wang & Xia, 2018 from China by the following characters: mandible with six teeth, maxilla styliform, tubercle Fr on head with three chaetae, tubercle Oc on head with three chaetae, Abd.V with 3+3 dorsal tubercles and De separate from Dl, and claw with a distinct basal inner tooth. However, the new species can be differentiated from L. fusa by the cephalic chaeta O of tubercle Fr free (not free in L. fusa ), cephalic tubercles Di separated (fused in L. fusa ), cephalic tubercle Dl with four chaetae (five in L. fusa ), and each tubercle Dl on Abd. I–III with three chaetae (two chaetae in L. fusa ).