Allopauropus (D.) crassescens Shen, 2007

Shen, Hong, Gai, Yonghua, Song, Daxiang, Sun, Hongying, Scheller, Ulf & Zhou, Kaiya, 2007, New species of Pauropodidae (Myriapoda: Pauropoda) from Nanjing, China, Journal of Natural History 41 (37 - 40), pp. 2313-2329 : 2317-2319

Allopauropus (D.) crassescens Shen and Song sp. n.

( Figure 3 )

Type material

Holotype: ad. 9 (female), Zijin Mountain , 12 August 2006, leg. H. Shen et al . Paratypes: one ad. 9 (female), same data as holotype, one ad. 9 (male), Laoshan Mountain , 13 September 2006, leg. H. Shen et al .

Diagnosis

Allopauropus crassescens may be closely related to A. lituiger ( Remy, 1957) from Australia and A. bispinosus ( Scheller, 1995) from northwestern Thailand. They have distinct similarities in the shape and chaetotaxy of the pygidium. They can be distinguished by: (1) the shape of the tergal antennal branch (3.9 times as long as greatest diameter in A. crassescens ; about twice longer than that distance in A. lituiger and 3.1 times as long in A. bispinosus ); (2) the shape of the antennal globulus g (short-stalked in A. crassescens and A. bispinosus ; proportionally long-stalked in A. lituiger ); (3) the shape of the genital papillae in males (distinctly tapering in A. crassescens and A. bispinosus ; roundedly conical in A. lituiger ); the shape of the anal plate (trapeziform and with short posteromedian appendage in A. crassescens ; subcordiform with short posteromedian appendage in A. bispinosus ; roundedly hexagonal with evenly rounded posterior margin in A. lituiger ).

Etymology

From the Latin crassescere 5 become swollen (referring to the submedian appendages of the anal plate).

Description

Length. (0.76–) 0.94 mm.

Head. Tergal setae thin, tapering, of medium length to fairly long, densely annulate. Relative lengths of setae: 1st row: a 1510, a 257; 2nd row: a 158, a 256 (–7), a 357; 3rd row: a 159, a 257; 4th row: a 15 (6–)7, a 256, a 35 (8–)9(–10), a 458 (–9). Ratio a 1 / a 1 – a 1 in 1st row 3.5(–3.6), in 2nd row (1.3–)1.4, in 3rd row 0.6(–0.7), in 4th row 3.0(–3.2). Length of temporal organs much longer than shortest interdistance. Head cuticle glabrous.

Antennae. Segment 4 with four setae, all thin, tapering, annulate. Relative lengths of setae: p 5100, p 9556(–57), p 05(80–)84, r 5(47–)50(–52). Tergal branch t 3.5(–3.7) times as long as greatest diameter and 1.4 times as long as sternal branch s, this 1.6 times as long as greatest diameter; anterior corner strongly truncated. Seta q 2.2(–2.4) times as long as s. Relative lengths of flagella (base segment included) and base segments alone: F 15100, bs 1510; F 2552 (–58), bs 255 (–6); F 35 (96–)98, bs 35 (9–)10. F 1 3.8(–4) times as long as t, F 2 and F 3 1.7(–1.8) and 3.2(–3.4) times as long as s, respectively. Globulus g 1.6 times as long as greatest diameter; width of g 1.1 times as long as greatest diameter of t.

Trunk. 4+4 setae on tergite I, 6+6 on II–IV, 6+4 on V, 4+2 on VI. Genital papillae distinctly narrowing distally, about twice as long as wide.

Bothriotricha. Relative lengths: T 15100, T 25 (127–)132, T 35 (155–)160(–165), T 45 (163–)164, T 55 (175–)180. All with simple straight axes with short oblique pubescence.

Legs. Coxa and trochanter of leg 9 with furcate setae; branches pubescent, thick, blunt; secondary branch shorter on coxa.

Tarsus of leg 9 slender, 3.9(–4.0) times as long as greatest diameter; setae subcylindrical, striate, proximal seta 0.3 length of tarsus and 3.0(–3.2) times longer than distal seta.

Pygidium. Tergum: posterior margin rounded, with low bulge projecting backwards above st. Relative lengths of setae: a 15100, a 25 (200–)214(–218), a 35 (286–)300(–312), st 5126(–132). a 1 short, broad, blunt, striate; a 2 and a 3 subcylindrical, striate; st clavate, bent inwards, with short pubescence. Distance a 1 – a 1 1.7(–1.9) times as long as a 1; distance a 1 – a 2 1.3(–1.5) times as long as distance a 2 – a 3; distance st–st about 1.6 times as long as st and 0.6(–0.7) of distance of a 1 – a 1.

Sternum: posterior margin with shallow indentation between b 1. Relative lengths of setae (a 15100): b 15 (675–)686(–690), b 25185 (–190). b 1 and b 2 subcylindrical, striate. Distance b 1 – b 1 0.8 times as long as b 1, distance b 1 – b 2 0.8(–0.9) times as long as b 2.

Anal plate: trapezoid, with short pubescence, lateral corners rounded; posterior margin with median triangular process 0.2 length of plate. A paired bladder-shaped, pubescent appendage protruding from posterior margin of plate; appendage 0.6 length of plate.

Figures

Figure 3. Allopauropus (D.) crassescens sp. n. (a–d, f–h) Holotype female; (e) paratype male; (i) paratype female. (a) Head, right side, dorsal view; (b) pygidium, dorsal view; (c) left antenna, dorsal view; (d) collum segment, median part, ventral view; (e) genital papillae; (f) tarsus of leg 9; (g) seta on coxa of leg 9; (h) seta on trochanter of leg 9; (i) T3.