Brasilidia jilinensis, Wu, Donghui & Yin, Wenying, 2007

Wu, Donghui & Yin, Wenying, 2007, New records of the genera Acerentulus and Brasilidia (Protura: Acerentomidae) from China, with descriptions of two new species, Zootaxa 1561, pp. 53-61 : 57-59

Brasilidia jilinensis sp. nov.

( Figs.19–36 )

Type material. Holotype: Female, from the coniferous forest of Wopi town, 44º12´N, 125º33´E, Dehui city, Jilin Province, northeastern China, collected by Dr. Donghui WU in September, 2006.

Paratype: 1 female, same data as holotype. Holotype and paratype are deposited in the Institute of Plant Physiology & Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, China.

Diagnosis. Striate band of abdomen VIII reduced. Labial palp reduced to four setae and stout, foliate sensillum. Foretarsal sensillum t1 spatulate, setae β 1 and δ 4 both short and sensillum-like, β 1 shorter than δ 4.

Description. Body length: 1270 µm.

Head: 115µm long in dorsal view, setae a, ls and pp present ( Fig. 19 ). Median pore present. Rostrum short. Pseudoculus nearly round, with two small lids ( Fig. 20 ), PR=12.8. Canal of maxillary gland simple ( Fig. 21 ), the proximal part 14 µm long, CF=8.2. Maxillary palpus with two sensillae ( Fig. 22 ), slender. Labial palpus rudimentary, with four setae and one stout foliate sensillum ( Figs. 23 ).

Legs: Foretarsus ( Figs. 24, 25 ) length 84 µm, claw 15 µm, with a pair of inner flaps, TR =5.6; empodium length 3 µm, EU=0.2; S-shaped seta subequal to claw. Dorsal sensillum t1 spatulate, BS=0.71; t2 thin; t3 broad and lanceolate. Exterior sensillum a short, reaching base of b and c; sensillum b also short, length about two-thirds of sensillum c base at the same level as c; c closer to d than to b, the apex of c surpassing base of sensillum e, the apex of d reaching the base of f; sensillum e not reaching base of claw; base of sensillum f closer to e than to g, apices of f and g surpassing base of claw; Interior sensillum a' broad, just distal to t1; b' thin, reaching base of c'; c' thin, its apex reaching base of claw. Ventral seta β 1 and interior seta δ 4, short and sensillum-like, β 1 shorter than δ 4. Interior setae δ 1, δ 2, δ 3 and δ 5 each short, but longer than δ 4, and apically pointed. Pores present between a and a3, and between t3 and g, respectively. Middle tarsus length 35 µm, claw length 15 µm. Hind tarsus length 40 µm, claw length 18 µm.

Body: Chaetotaxy as shown in Table 2 and Figs. 26–33 . Thoracic tergites II–III each with two pair of dorsal anterior setae (A2 and A4), seta P2a on meso- and metanotum nearer to P3 than to P2. Urotergites I–V each with three pairs of anterior setae, A1, A2 and A5, and seta P1a and P3a absent; urotergite VI and VII with 8 anterior setae, A1, A2, A4 and A5, seta P1a and P3a absent on urotergite VI, P1a and P3a present on urotergite VII; urotergite IX with 14 setae, urotergite X with 12 setae. Urosternites I–VII with 3 anterior setae; urosternites VIII with 4 anterior setae and 2 posterior setae; urosternites IX–XI with 4 setae; urosternites XII with 6 setae.

Dorsal Ventral

formula composition of setae formula composition of setae Setae P1a and P2a on thoracic tergites II and III, P2a on abdominal tergite I, and P2a and 4a on abdominal tergites II –VI short and lanceolate, about 2-3 µm long. Seta P5a on thoracic tergites II and III minute, 3 µm long. Seta M1a on thoracic sternite I, A1a on thoracic sternites I–III, P1a on abdominal sternites I–VII, P2a on abdominal tergites I, P2a and P4a on abdominal tergites II–VII, and P1a and P3a on abdominal tergite VII, sensillum-like, 4µm long.

Integumental pores distinct ( Figs. 26–33 ). Thoracic tergite II with two pairs of pores, one pair between A2 and P2, one pair posterior to P4; tergite III with a pair of pores anterior to P2. Thoracic sternites II and III each with one pore posterior to Ac. Abdominal tergites I–VI each with a pair of pores between P1 and A2, tergite VII with a pair of pores close to P1a; tergite VIII with a pair of pores between M2 and M3; all pores lacking associated pectines. Abdominal sternites IV and VI with a pair of pores close to P1a, VII with one pore close to one of P1a. Telson with dorsal central pore and a pair of ventral pores at both sides.

Abdominal appendage I with four setae, II and III each with three setae ( Fig. 34 ). On abdomen VIII, striate band reduced ( Fig. 30, 31 ), comb with about 11 small, regular teeth ( Fig. 35 ). Female squama genitalis with long pointed acrostylus ( Fig. 36 ).

Younger instars: Unknown.

Distribution. Jilin Province, northeastern China.

Etymology. The new species is named after Jilin Province where the type specimens were collected.

Remarks. the genus Brasilidia was established by Nosek in 1973 with B. tropica as type species. The new species is related to the genus of Brasilidia in the following characteristics: 1) Abdominal legs II–II with three setae; 2) Striate band of abdomen VIII reduced; 3) Labial palp reduced; 4) Abdominal sternite VIII with four anterior and two posterior setae. In contra-distinction to the other species of Brasilidia ( Tuxen, 1976, 1984; Szeptycki, 2003), sensilla t3 of the new species on the foretarsus is not cylindrical, setae β 1 and δ 4 differentiated (of different shape as δ 1– δ 3, δ 5), and reduced labial palp with four setae and one sensilla in the new speices. Although the differences are present between the new species and the other species of Brasilidia , we still place the new species into the genus of Brasilidia . We think it might be possible to establish a new genus if more species of this type are to be found in the future.

Figures

FIGURES 19 – 27. Brasilidia jilinensis sp. nov. 19. Head, dorsal view. 20. Pseudoculus. 21. Canal of maxillary gland. 22. Maxillary palpus. 23. Labial palus. 24. Foretarsus, dorsal view. 25. Foretarsus, ventral view. 26. Mesonotum. 27. Mesosternum. Arrows indicate pores.

FIGURES 28 – 36. Brasilidia jilinensis sp. nov. 28. Urotergites VI – VII. 29. Urosternites VI – VII. 30. Urotergites VIII – IX. 31. Urosternites VIII – IX. 32. Urotergites X – XII. 33. Urosternites X – XII. 34. Abdominal appendage II. 35. Comb on abdominal tergite VIII. 36. Female squama genitalis. Arrows indicate pores.

Tables

TABLE 2. Chaetotaxy of Brasilidia jilinensis sp. nov.

Thorax I 4	1, 2	--	A1, 1a, M1, 1a P1, 2, 3
II–III ------	A2, 4, M1 P1, 1a, 2, 2a, 3, 4, 5, 5a	--	Ac, 1a, 2, 3, M1 P1, 2
Abdomen I ------	A1, 2, 5 P1, 2, 2a, 3, 4	--	Ac, 2 P1, 1a
II–III ------	A1, 2, 5 P1, 2, 2a, 3, 4, 4a, 5	--	Ac, 2 Pc, 1a, 2
IV-V ------	A1, 2, 5 P1, 2, 2a, 3, 4, 4a, 5	--	Ac, 2 P1, 1a, 2, 3
VI ------	A1, 2, 4, 5 P1, 2, 2a, 3, 4, 4a, 5	--	Ac, 2 P1, 1a, 2, 3
VII ------	A1, 2, 4, 5 P1, 1a, 2, 2a, 3, 3a,4, 4a, 5	--	Ac, 2 P1, 1a, 2, 3
VIII ------	A2, 4, 5, M1, 2, 3, 4 P2, 3, 4, 5	--	A1, 2 P 1a
IX 14	1, 2, 3, 3a, 4, 4a, 5	4	1a, 2
X 12	1, 2, 3, 3a, 4, 5	4	1a, 2
XI 6	1, 2, 3	4	1, 2
XII 9		6	1a, 2, 3