Allopauropus (Decapauropus) disphaeroides 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 : 2314-2316

Allopauropus (Decapauropus) disphaeroides Shen and Song sp. n.

( Figure 2 )

Type material

Holotype: ad. 9 (female), Zijin Mountain , 27 August 2006, leg. H. Shen et al . Paratypes: one ad. 9 (female), Zijin Mountain , 11 July 2006, leg. H. Shen et al.; one ad. 9 (male), Laoshan Mountain, 16 September 2006, leg. H. Shen et al .

Diagnosis

The new species may be close to Allopauropus koreanus Scheller, 1979 from North Korea. There are similarities especially in the structure of the pygidium, but the two species can be distinguished by the following characters: the shape of st (subcylindrical and glabrous in A. disphaeroides ; a little clavate, curved inwards, converging, striate, with short pubescence in A. koreanus ); the glabrous bands on the tergal side of the anal plate (two straight, submedian, diagonal ones in A. disphaeroides ; one short, straight, median one and two curved, sublateral ones, all longitudinally, in A. koreanus ); the shape of the appendages of the anal plate (subspherical, with long pubescence in A. disphaeroides ; fusiform with sparse, short, oblique pubescence in A. koreanus ). Moreover, the antennal setae p and p 9 and the proximal seta on the tarsi of the last pair of legs are proportionately longer in A. koreanus than in A. disphaeroides .

Etymology

From the Greek di 5 two and sphaera 5 ball (referring to the appendages of the anal plate).

Description

Length. (0.64–)0.87(–0.89) mm.

Head. Tergal setae thin, tapering, of medium length to fairly long, densely annulate. Relative lengths of setae: 1st row: a 1510, a 2511 (–12); 2nd row: a 15 (7–)8, a 25 (9–)10 (–11), a 359 (–10); 3rd row: a 15 (9–)10, a 259 (–10); 4th row: a 158 (–10), a 257, a 35 (6–)7(–8), a 4510. Ratio a 1 / a 1 – a 1 in 1st row 1.4(–1.5), in 2nd row 2.8(–3.0), in 3rd row (1.4–)1.6, in 4th row 1.4. Length of temporal organs much longer than shortest interdistance. Head cuticle with distinct granules.

Antennae. Segment 4 with five setae, all thin, tapering, and annulate. Relative lengths of setae: p 5100, p 95(65–)67, p 0530(–33), r 5(34–)37(–39), u 5?(19–20). Tergal branch t thin, 3.9 times as long as greatest diameter and 1.6(–1.9) times as long as sternal branch s, the latter (1.4–)1.6 times as long as greatest diameter. Seta q with high insertion point, 0.6 length of s. Relative lengths of flagella (base segment included) and base segments alone: F 15100, bs 1510; F 25 (32–)34, bs 25 (3–)4; F 35 (76–)78(–80), bs 358. F 1 twice longer than t, F 2 and F 3 1.2(–1.3) and 2.8(–3.1) times as long as s, respectively. Globulus g 1.2 times as long as greatest diameter; width of g 0.7 of greatest diameter of s .

Trunk. 4+4 setae on tergite I, 6+6 on II–IV, 6+4 on V, 4+2 on VI. Genital papillae short, blunt, 1.5 times as long as wide; distal seta with thick base.

Bothriotricha. Relative lengths: T 15100, T 25 (105–)110(–118), T 35124 (–130), T 45 (137–)140, T 55 (145–)150(–156). All with simple straight axes and short oblique pubescence.

Legs. Coxa and trochanter of leg 9 with furcate setae; branches thick, subcylindrical, with short pubescence; secondary branch a little longer than primary one. Secondary branch rudimentary in anterior legs.

Tarsus of leg 9 slender, (4.0–)4.1 times as long as greatest diameter. Setae curved, with short oblique pubescence. Proximal seta long, thin, pointed, 0.4(–0.6) length of tarsus, 3.5(–3.7) times as long as distal seta.

Pygidium. Tergum: posterior margin rounded. Relative lengths of setae: a 15100, a 2592 (– 94), a 35 (75–)93, st 513(–15). All but st long, thin, with short, depressed-oblique pubescence; st subcylindrical, glabrous. Distance a 1 – a 1 0.4 length of a 1, distance a 1 – a 2 0.9(–1.1) of distance a 2 – a 3; distance st–st 0.7(–0.8) length of st and 0.3(–0.4) of distance a 1 – a 1.

Sternum: posterior margin with median indentation below anal plate. Relative lengths of setae (a 15100): b 1575 (–77), b 25 (44–)46. These setae long, thin, pointed and with short oblique pubescence. Distance b 1 – b 1 0.8(–1.0) length of b 1; distance b 1 – b 2 0.2 length of b 2.

Anal plate: subsquare, posterolateral corners rounded, posteromedian margin almost straight but with small V-shaped median indentation; three times longer than wide; posterolateral lobes with short-stalked subspherical appendages with proportionately long, thin, erect, pubescence. Posterolateral corners of plate with oblique glabrous bands on tergal side dividing plate into three parts: median part cordiform, with dense pubescence; anterolateral parts right-angled triangles with sparser long pubescence. Pubescence on sternal side similar to that on tergal side.

Figures

Figure 2. Allopauropus (D.) disphaeroides sp. n. (a–c, f–i) Holotype female; (d, e) paratype male. (a) Head, right side, dorsal view; (b) pygidium, dorsal view; (c) left antenna, dorsal view; (d) genital papillae; (e) collum segment, median part, ventral view; (f) seta on coxa of leg 9; (g) seta on trochanter of leg 9; (h) tarsus of leg 9; (i) T3.