Lobellina fusa, Jiang, Ji-Gang, Wang, Wen-Bin & Xia, Hu, 2018

Jiang, Ji-Gang, Wang, Wen-Bin & Xia, Hu, 2018, Two new species of Lobellini from Tianmu Mountain, China (Collembola, Neanuridae), ZooKeys 726, pp. 1-14 : 4-6

Lobellina fusa sp. n. Figs 1-4, 5-7, Appendix 1, Tables 1 a– 1b

Type material.

Holotype male on slide, on the path from Longfengjian to Fairy Peak, Tianmu Mountain, Zhejiang Province, China. Coordinates: 30°23'11"N, 119°26'07"E, 1100-1500 m a.s.l., 25 July 2011, leg. Ji-Gang Jiang (Housed in Hunan University of Arts and Science, J2011072501). Paratypes: three females and two males, same data as holotype (Housed in Hunan University of Arts and Science, J2011072501).

Etymology.

The species name refers to the fused Di tubercles on head.

Diagnosis.

Habitus typical of the genus Lobellina . Body dorsal tubercles well developed. Cephalic Di tubercles fused. Chaeta O of tubercle Fr present. 3+3 black eyes. Labrum chaetotaxy as 0/2, 2. Mandible with six teeth. Maxilla consisting of two crochet-like lamellae and two teeth. Chaetae formula of tubercle Di on Th. I–Abd. V as 1, 3, 3/2, 2, 2, 2, 3. S-chaetae and s-microchaeta formula on Th. I–Abd. V as 0, 2+ms, 2/1, 1, 1, 1, 1. Ventral tube with 4+4 chaetae, furcular vestige with 3 chaetae. Unguis with an inner tooth and without lateral tooth.

Description.

Body length 2.2-3.7 mm. Body color red while alive and white in alcohol.

Head: eyes 3+3, black (Fig. 1). Antenna 4-segmented. Ant. I and II with seven (two with swollen apex) (Fig. 2) and eleven chaetae respectively. Ant. III dorsally fused to Ant. IV. Ant. III organ consists of two short rods and two long guard chaetae, two short rods exposed in separate pits. Ant. IV with trilobed apical bulb, dorsally with eight sensilla, slender i chaeta, 12 slender cylindrical chaetae (mou) and minute organite (or) (Fig. 2). Labrum chaetotaxy as 0/2, 2. Labium with eleven chaetae and two minute distal x sensilla (Fig. 5). Mandible with three main teeth, the apical one subdivided in four minute toothlets (Fig. 3). Maxilla consists of two fused lamellae, stylet-like and one with two small apical teeth (Fig. 4). Cephalic tubercles and chaetotaxy shown on Fig. 1 and Appendix 1, Table 1a. Macrochaetae and mesochaetae on body weakly serrate (observe under lens of 100 ×), and sheathed on distal half, ending in a swollen and blunt apex (Fig. 1). Microchaetae smooth and pointed. All dorsal cephalic tubercles (except Di) independent.

Thoracic and abdominal tubercles and chaetotaxy shown in Figs 1, 7 and in Appendix 1, Table 1b. Sensory chaetae and s-microchaetae formula on Th. I–Abd. V as 0, 2+ms, 2/1, 1, 1, 1, 1. Chaetae Di3 free on Th. II and III. Each tubercle on Abd. VI with 7 chaetae (3 Ml and 4 Mcorme).

Appendages: Unguis with an inner tooth and without lateral tooth (Fig. 6). Unguiculus absent. Ventral tube with 4+4 chaetae (Fig. 7), furcular vestige with three chaetae and no microchaetae (Fig. 7). Chaetotaxy of legs, ventral tube, and furcular remnant shown in Appendix 1, Table 1b.

Ecology.

Under leaves in forest.

Remarks.

The taxon Lobellina was erected by Yosii in 1956 as a subgenus of the genus Lobella Börner, 1906. It was raised to generic status by Cassagnau (1983) and redefined by Deharveng and Weiner (1984): body without blue pigment, 3+3 black eyes. Tubercles on the head and the tergites well developed, marked by a bump of the tegument and /or by differentiated tertiary grain, or some more strong secondary grains. Body without reticulation. Chaetotaxy of labrum as 0/2, 2. Maxilla styliform, mandible tridentate to multidentate. The sgd of Ant. III organ not shifted to ant. IV. Dorsal macrochaetae thickened and double lined, rounded to the apex. Chaetotaxy of type s normal (2+ms, 2/1, 1, 1, 1, 1). Abd. I without supplemental s-chaeta on lateral tubercle. Posterior chaetotaxy of head of cross-type. Chaetotaxy of tubercles Di of Th. II and III characteristic, with two macrochaeta (Di1 and Di2) and a small microchaeta, sometimes indistinct (Di3). Abd. V with 2+2 or 3+3 tubercle, tubercle De is isolated from the tubercle Dl, or fused to tubercle Dl.

To date, 12 valid species are known in the genus Lobellina ( Deharveng and Weiner 1984, Ma and Chen 2008). The new species can be distinguished from others by having six teeth on the mandible and fused tubercle Di on head. A key for all species of the genus is given below.