Vitronura paraacuta, Wan, Ya-Ru, Wang, Wen-Bin & Jiang, Jigang, 2016

Wan, Ya-Ru, Wang, Wen-Bin & Jiang, Jigang, 2016, New Neanurinae (Collembola: Neanuridae) from Central China, Zootaxa 4139 (2), pp. 183-196 : 184-187

Vitronura paraacuta sp. nov.

Figs 1–7 , Tab. 1–2 , 5

Type material. Holotype (female) and 7 paratypes (5 females and 2 males) on slides, China, Hunan Province, Changde City, Hefu forest park (29º03’021”N, 111º39’932”E), ca 50m a.s.l., under leaves at a small ditch in forest, 7.iv.2011, leg.: JiGang Jiang, Ya-Ru Wang and Wan-Jun Yu (collection number: J2012040701). All types deposited in Zoology Key Laboratory of Hunan Higher Education, Hunan University of Arts and Science, Changde, China.

Description. Body length: 1.7–2.6 mm (holotype: 2.2 mm). Body color: red alive and white in alcohol.

Head: eyes 2+2 ( Fig. 1 ). Antenna equal to diagonal of the head. Ant. I and II with 7 and 12 chaetae respectively. Ant. III dorsally fused to Ant. IV. Ant. III organ consists of 2 short microsensilla and 2 long sensilla (sgd and sgv); ventral ms present. Ant. IV with trilobed apical bulb, dorsally with 8 S, i -chaeta, 12 mou, 5 chaetae d and or ( Fig. 2 ). Labrum distally not ogival, chaetotaxy as 0/2, 2( Fig. 6 ). Labium with 2 x and 11 Chaetae ( Fig. 5 ). Mandible with 4 teeth ( Fig. 3 ). Maxilla crochet-like ( Fig. 4 ). Cephalic tubercles and chaetotaxy see Fig. 1 and Tab. 1 , dorsal macrochaetae and mesochaetae similar to those on thorax and abdomen; almost smooth with hyaline sheath and apically blunt. Microchaetae smooth and sharp. All dorsal cephalic tubercles (except L+So) independent. Tubercle Cl with 2 Mc and 2 me. Tubercle An with 1 Ml and 3 me. Tubercle Fr with 2 Ml and 1 Mc (O-chaeta). Tubercle Di on head with 1 Ml, and De with 1 Ml and 2 me. Tubercle Dl with 1 Ml and 3 me. Tubercle L+So with 3 Ml and 5 me.

Thoracic and abdominal tubercles and chaetotaxy shown in Figs. 1 , 7 and Tab. 2 . Chaetae formula of tubercle Di on Th. I–Abd. V as 1, 3, 3/2, 2, 2, 2, 3. Sensory chaetae and s-microchaeta formula on Th. I–Abd. V as 0, 2+ms, 2/1, 1, 1, 1, 1. Di tubercle on Abd. V with 1 Ml, 2 me ( Fig. 1 ). Each tubercle on Abd. VI with 7 chaetae (4 Ml and 3 me).

Appendages: Ventral tube with 4+4 chaetae ( Fig. 7 ). Furcal vestige with 5 (sometimes 4) chaetae ( Fig. 7 ). Unguis with an inner tooth and without lateral tooth. Chaetotaxy of legs, ventral tube and furcal rest shown in Tab. 2 .

Etymology. The name of the new species derived from its similarity of chaetotaxy to North Korean species V. acuta Deharveng & Weiner, 1984 .

Terga Legs Remarks. This new species is most similar to V. a c ut a Deharveng & Weiner, 1984, but it differs by the bigger size (1.7–2.6 mm vs. 1.2 mm); trilobed apical bulb of Ant. IV (vs. simple or bilobated in the latter); mandible with 4 teeth (vs. 3 teeth in the latter); claw with inner tooth (vs. claw without inner tooth in the latter), group Ve on Abd. IV with 7–8 chaetae (vs. 10 chaetae to the latter). Diagnostic characters between the new species and some similar species of the genus are presented in Tab. 5 .

Figures

FIGURE 1. Vitronura paraacuta sp. nov. Total dorsal chaetotaxy (50 µm).

FIGURES 2 – 7. Vitronura paraacuta sp. nov. 2, Antenna. 3, Mandible. 4, Maxilla. 5, Labium. 6, Labrum. 7, Ventral chaetotaxy of abdomen (2 – 6, 20 µm; 7, 100 µm).

Tables

TABLE 1. Cephalic tubercles and chaetotaxy of Vitronura paraacuta sp. nov.

Tubercle	Number and type of chaetae	Names of chaetae
Cl	2 Mc 2 me	F G
An	1 Ml 3 me	B C, D, E
Fr	2 Ml 1 Mc	A O
Oc	1 Ml 1 Mc 1 me	Ocm Ocp Oca
Di	1 Ml	Di1
De	1 Ml 2 me	De1 De2, Di2
Dl	4 (1 Ml + 3 me)	uncertain
L+So	8 (3 Ml + 5 me)	uncertain