Stylopauropus biaristatus Qian

Qian, Changyuan, Chu, Kelin, Liu, Xiaorui & Sun, Hongying, 2014, Four new species of Pauropoda (Brachypauropodidae, Eurypauropodidae, Pauropodidae) from the Sanqingshan Mountains, Jiangxi Province, China, Zootaxa 3764 (1), pp. 81-91 : 89-90

Stylopauropus biaristatus Qian sp. n.

(Figure 4)

Type material. Holotype. ad.9 (female), Sanqingshan, Jiangxi, 13 July 2012, leg. Qian & Chu

Paratypes. ad.9 (female), Sanqingshan, Jiangxi, 10 July 2012, leg. Qian & Chu

ad.9 (female), Sanqingshan, Jiangxi, 13 July 2012, leg. Qian & Chu

Etymology. From the Latin bi = two and arista = seta (referring to the two posterior appendages of the anal plate).

Diagnosis. The new species may be close to Stylopauropus sulcatoidus Scheller, 2005 ,from North Carolina, USA. They have similarities especially in the structure of the pygidium, but the new species is distinguished from S. sulcatoidus by the following characters: t as long as s in S. sulcatoidus ; t is longer than s in S. biaristatus sp. n.; a 1, a 2, a 3 striate and pubescent in S. sulcatoidus ; in S. biaristatus sp. n. with striate. The posterior margin of the pygidial tergum with broad cleft between a 1 with many short, stout, straight and erect pubescence hairs in S. sulcatoidus , in S. biaristatus sp. n. is no cleft and glabrous margin. The shape of the anal plate is another distinguishing character: heart-shaped with posteromedian incision in S. sulcatoidus ; in S. biaristatus sp. n. with two posterior incisions. The posterior of the anal plate in S. sulcatoidus with two short, clavate, pubescence; thin cylindrical striate appendages in S. biaristatus sp. n.; anal plate pubescence in S. sulcatoidus , glabrous in S. biaristatus sp. n.

Description. Length. 0.45 (- 0.68) mm

Head. Tergal setae of short to medium length, subcylindrical, densely annulate, blunt. Relative lengths of setae, 1st row: a 1 = 10, a 2 = (9.4 -) 10.6; 2nd row: a 1 = 9.4 (- 10), a 2 = 16.7 (- 18), a 3 = (10 -) 13.3; 3rd row: a 1 = 12.8 (- 13), a 2 = (11.6 -) 12.8; 4th row: a 1 = 13.8 (- 16), a 2 = 21(-?), a 3 = (18 -) 21, a 4 = 16.7 (- 17); The ratio a 1/ a 1– a 1 in 1st row 0.7 (- 1.0), 2nd row 0.4, 3rd row 0.4 and 4th row 0.7 (- 0.8). Head cuticle glabrous.

Antennae. Segment 4 with four cylindrical setae; Relative lengths of setae: p = 100, p ' = 70 (- 71), p '' = 55 (- 62), r = (15 -) 17; Tergal seta p 0.8 (- 0.9) of the length of tergal branch t. The latter fusiform, 3.1 (- 3.6) times as long as its greatest diameter and (1.1 -) 1.2 times as long as sternal branch s; that branch 1.9 (- 2.1) times as long as its greatest diameter. Seta q cylindrical, with annulate, 0.5 (- 0.7) times as long as s. Relative lengths of flagella (basal segments included) and basal segments: F 1 = 100, bs 1 = 8 (- 9); F 2 = 73 (- 74), bs 2 = 7.6 (- 9.5); F 3 = (81-) 83, bs 3 = (6.7 -) 8.5. The F 3 thinnest; F 1 (2.3 -) 2.5 times as long as t, F 2 and F 3 2.0 (- 2.1) and (2.2 -) 2.3 times as long as s respectively. Distal calyces helmet-shaped; distal part of flagella axes cylindrical. Globulus g 1.9 times as long as wide; about nine bracts, capsule subspherical; width of g 1.3 (- 1.5) of the greatest diameter of t. Antennae almost glabrous.

Trunk. Setae on tergites thin, cylindrical; 4 + 4 setae on tergite I, 6 + 6 on II–IV, 6 + 4 on V, 4 + 2 on VI. Bothriotricha. T 1 = 100, T 2 = 95 (- 98), T 3 = 104 (- 108), T 4 = (103 -) 107, T 5 = 135 (- 140), all with simple straight axes and with pubescence thin erect.

Legs. Tarsus of leg 9 slender, (3.6 -) 4.0 times as long as greatest diameter; setae curved, dista seta straight, blunt, annulate, proximal seta long, pointed, pubescent, 0.2 (- 0.3) of length of tarsus, 1.5 (- 2.1) of length of distal seta.

Pygidium. Tergum. Posterior margin with broad indentation between a 1 setaeis glabrous. Relative lengths of setae: a 1 = 100, a 2 = (138 -) 141, a 3 = 173 (- 180), st = (75 -) 81.8. All setae but st pointed, densely annulate; st blunt, subcylindrical, curved inwards, glabrous; Distance a 1– a 1 (1.7 -) 1.9 times as long as a 1; distance a 1– a 2 (2.0 -) 2.5 times as long as a 2– a 3; distance st–st 1.9 (- 2.1) times as long as st and 0.83 of length of distance a 1– a 1.

Sternum. Posterior margin with shallow indentation between b 1. Relative lengths of setae (a 1 = 100): b 1 = 282 (- 299). All setae subcylindrical, pointed. Distance b 1– b 1 1.2 (- 1.5) of length of b 1.

Anal plate. Narrowest anteriorly, approximately heart-shaped, posterior margin with two incisions and rounded posterolateral corners; two short, cylindrical appendages, 0.6 times of the length of the plate, extending backwards from posterior part of tergal side. Plate glabrous, appendages with striate, distal part helmet-shaped.

FIGURE 4. Stylopauropus biaristatus Qian sp. n. holotype (female). A, right antenna, ventral view. B, pygidium, tergal view. C, head, submedian and right part, tergal view. D, tarsus of leg 9. E, T 5. F, T 3. G, collum segment, median and left part, sterna view.