Neobaculentulus heterotarsus, Bu & Xie, 2006

Bu, Yun & Xie, Rong Dong, 2006, Neobaculentulus heterotarsus sp. n. from Liaoning, China (Protura: Berberentulidae), Zootaxa 1188, pp. 63-68 : 63-67

Neobaculentulus heterotarsus , new species ( Fig. 1 –22)

Adult

Body length 764–871 µm (n=9).

Head— Elliptic, length 79–89 µm, width 59–83 µm (n=9). Additional and postpseudocular seta present. Seta ls short. Rostrum not protruded. Dorsal and ventral side of head with no sensory setae. Pseudoculus almost circular, width 5.9 µm. PR=13.4–15.4.

Canal of maxillary gland straight and smooth, with blind end slightly bulked. Hind part of maxillary gland length 13.8 µm. CF=5.3–6.3. Maxillary palpus with 2 sensilla, parallelsided and subequal. Labial palpus reduced, with 2 setae and a short parallel­sided sensillum, one seta longer than another ( Figs. 1–5 ).

Thorax— Chaetotaxy on thoracic tergites II–III with 2 anterior setae (A2 and A4), seta P1a, P2 and P5a very short and cone­shaped. P2a nearer to P3 than to P2. Pronotum with no pores, mesonotum with pore al and l, metanotum with pore l. Thoracic sterna with no pores ( Figs. 6–7 ).

Foretarsus— Length 57–67 µm, claw 15.8–17.7 µm and lacking inner flap, TR=3.3– 3.6; Empodium short, EU=0.22–0.25; S­shaped seta slightly longer than claw. Dorsal sensillum t­1 claviform, BS=0.53–0.58; t­2 long and thin and curved near apex; t­3 gemmiform and slightly swelled. Exterior sensillum a filiform, surpassing base of c and d; b extremely long, slightly surpassing base of 4, its base apparently lower than base of c and d; c close to d, d longer than c; sensillum e, f and g all surpassing base of claw; e extremely long; f slightly nearer to e than to g; g shorter than e and f. Interior sensillum a' subequal to level of t­1; b' absent; c' thin and long, its apex surpassing base of claw. Length formula of foretarsal sensilla: t­3 <t­1 <c = t­2 <a = g = a' <d = c' <f <e <b. Seta 1 and 4 short subuliform in shape, 1 slithtly longer than 4; Middle tarsus length 24–28 µm, hind tarsus length 26–32 µm, both claw 12–16 µm in length (Figs. 16–17).

Abdomen— Chaeotaxy as shown in Table 1. Abdominal tergite I with 2 pairs of anterior setae (A1 and A2), without P1a and with thin P4. Urotergite II–VI with 3 pairs of anterior setae (A1, A2 and A5), without P1a and P3a, accessory setae short hair­like. Urotergite VII with 2 + 2 anterior setae (A4 and A5), seta P1a and P3a present, with 9 + 9 posterior setae. Urotergite I with pore psm, other pores absent. Urotergite II–VII with pore al and psm. Pore psm on urotergites II–VI in anterior position, on VII near hind margin of tergite, close to seta P1a. Pore psl and l absent ( Figs. 8–9 ).

Abdominal legs with 4, 2, 2 setae. Accessory setae on urosternite I–VII short hair­like. Urosternite I–IV without pores. Urosternite V–VII with single or paired asymmetrical pores, very near to P1 or P1a, but quite variable ( Figs. 10–15 ).

Striate band on abdominal segment VIII reduced, with proximal margin undulant and with sparse denticles on it. Segment VIII with paired pore psm on urotergite and without pores on urosternite. Comb oblique rectangle in form, with 7–9 irregular teeth on hind margin (Figs. 18, 20).

Segment IX–XI without pores on urotergites and urosternites. Seta 1a and seta 1 on urotergite IX in equal length. Urosternite XI with 3 + 3 setae, seta 2 very short, seta 1 and 3 long. Segment XII with single middle pore on the urotergite, with paired pore al on urosternite (Figs. 21–22).

Female squama genitalis moderate in length and with pointed acrostyli (Figs. 20).

Younger instars— Unknown.

Chaetal variability— One of paratype specimens with asymmetrical P1a on the left of urotergite VI.

Holotype— female (mounted), from the deciduous­conifer mixed forest of Mt. Qianshan, 41 o 05' N, 123 o 27' E, 190 m alt., Anshan, Liaoning Province, China, 3­VI­1994, collected by Mr. Rong­dong XIE and Mr. Jun ZHANG.

Paratype— 6 females, 2 males (mounted), same data as for holotype .

Type specimens are deposited in Shanghai Entomological Museum, Institute of Plant Physiology & Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences .

Etymology— Named as heterotarsus indicating that the fortarsus of new species is different from those of other species of the genus Neobaculentulus .

Figures

FIGURES 1–15. Neobaculentulus heterotarsus sp. n., holotype. 1, head, dorsal view. 2, canal of maxillary gland. 3, maxillary palpus. 4, labium. 5, pseudoculus. 6, part of mesonotum. 7, part of metanotum. 8, part of urotergite VI. 9, part of urotergite VII. 10, posterior setae on urosternite V. 11, posterior setae on urosternite VI. 12, posterior setae on urosternite VII. 13, abdominal leg I. 14, abdominal leg II. 15, abdominal leg III.