Decapauropus duomamillatus Qian & Dong

Qian, Changyuan, Dong, Yan, Guo, Hua, Chu, Kelin & Sun, Hongying, 2013, Pauropods (Myriapoda: Pauropoda) from eastern China, descriptions of three new species and revision of Pauropus bifurcus Zhang & Chen, 1988, Zootaxa 3608 (2), pp. 116-126 : 121-123

Decapauropus duomamillatus Qian & Dong sp. nov.

( Figure 3 )

Type material. Holotype. ad.9 (female), Qixia Mountain, Jiangsu, 23 September 2010, leg. Qian et al.

Paratypes. ad.9 (female), Qiaxia Mountain, Jiangsu, 15 October 2011, leg. Qian et al.

Diagnosis. The shape of the antennae and the anal plate indicate that the new species is close to two previously described species from North America and Australia: Decapauropus alaskae Scheller 1986 from Chena Ridge, Fairbanks, Alaska, and Decapauropus terrestris Scheller 2009 from Savage River Pipeline Road, Australia. D. duomamillatus differs from these two species by the following characters: the shape of the setae on the pygidium (all setae but b2 are subcylindrical, blunt, and glabrous in D. duomamillatus ; all setae in D. alaskae are cylindrical, thin, distally tapering, and with very shortly pubescent; all setae in D. terrestris are subcylindrical, thin, annulate, blunt); the shape of st (st blunt, short, subcylindrical, glabrous in D. duomamillatus ; st long, inwards, annulate in D. alaskae ; st pointing inwards, almost glabrous in D. terrestris ); and the shape of the anal plate (U–shaped incision, plate glabrous and with two very short, subglobular appendages in D. duomamillant . V–shaped incision, plate with two fusiform striate appendages projecting backwards in D. alaskae ; V–shaped incision, plate glabrous and with two very short, cylindrical, blunt, shortly pubescent appendages in D. terrestris ).

Etymology. From the Latin duo - = two and mamillatus = papillary (referring to the anal plate with two appendages).

Description. Length. 0.52(–0.81) mm

Head. Tergal setae of short to medium length, densely annulate, thin, blunt. Relative lengths of setae, 1st row: a 1=10, a 2=10(–12); 2nd row: a 1=11.4(–13), a 2=10(–12), a 3=13(–15); 3rd row: a 1=(13–)15, a 2=10(–12); 4th row: a 1=11(–13), a 2=14(–17), a 3=14(–?), a 4=11(–15); The ratio a 1/ a 1– a 1 in 1st row (1.5–)1.8, 2nd row 0.7(–0.8), 3rd row (3.5–)4.5 and 4th row (1.1–)1.3. Temporal organs oval in tergal view, their length 1.35 times as long as their shortest distance apart. Head cuticle glabrous.

Antennae. Segment 4 with four cylindrical setae; relative lengths of setae: p =100, p' =45(–46), p'' =(58–)60, r =(36–)45; Tergal seta p (0.5)0.64 of length of tergal branch t. The latter fusiform, 4.4(3.9) times as long as its greatest diameter and 1.6(1.8) times as long as sternal branch s; that branch 2.5(2.8) times as long as its greatest diameter. Seta q cylindrical, annulate, blunt, 1.2 times as long as s. Relative lengths of flagella (basal segments included) and basal segments: F 1=100, bs 1=10; F 2=88(–92), bs 2=9; F 3=80(–84), bs 3=8. F 1 1.4 times as long as t, F 2 and F 3 1.8(–2.1) and (1.4–)1.6 times as long as s, respectively. Distal calyces conical; distal part of flagella axes fusiform. Globulus g with flattened capsule. 1.0(–1.1) times as long as wide; about nine bracts, capsule subspherical; width of g 1.0(–1.1) times as long as greatest diameter of t. Antennae almost glabrous.

Trunk. Setae of collum segment somewhat clavate, annulate, blunt, furcated but with rudimentary glabrous blunt secondary branches. 4+4 setae on tergite I, 6+6 on II–IV, 6+4 on V, 4+2 on VI. Relative lengths of bothriotricha: T 1=100, T 2=85(–90), T 3=108(–120), T 4=(120–)129, T 5=166(–170), all with simple straight axes; all with pubescence thin erect.

Legs. Setae on coxa and trochanter of leg 9 similar, furcated with subcylindrical blunt branches. Tarsus of leg 9 short, somewhat tapering, 2.8 times as long as its greatest diameter. Setae subsimilar, thin, cylindrical, striate; their length 0.2 of length of tarsus. Cuticle of tarsus glabrous.

Pygidium. Tergum. Relative lengths of setae: a 1=100, a 2=(164–)176, a 3=(389–)400, st =(45–)47. All setae clavate, blunt, glabrous; distance a 1 –a 1 (2.2–)2.4 times as long as a 1; distance a 1– a 2 3.6(–3.8) times as long as a 2– a 3; distance st – st 2.5(–2.7) times as long as st and 0.5(–0.7) 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=(570–)576, b 2=(210–)212. b 1 subcylindrical, blunt. b 2 tapering bent inwards,. Distance b 1– b 1 0.74(–0.77) of length of b 1; distance b 1– b 2 1.0(–1.2) times as long as b 2.

Anal plate. Broadest anteriorly, glabrous; 1.8 times as long as broad, with a U–shaped posterior incision separating two short, subcylindrical posterolateral lobes; two short, globular, parallel appendages protruding backwards from distal part of lobes, 0.11 of length of the plate; plate and appendages glabrous.

Figures

FIGURE 3. Decapauropus duomamillatus sp. nov. holotype (female). A, head, submedian and right part, tergal view. B, right antenna, ventral view. C, collum segment, median and left part, ventral view. D, T 3. E, seta on trochanter of leg 9. F, tarsus of leg 9. G, pygidium, tergal view.