Decapauropus bidrepanoides Qian

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 : 123-125

Decapauropus bidrepanoides Qian sp. nov.

( Figure 4 )

Type material. Holotype. ad.9 (female), The Sea of bamboos, Jiangsu, 23 May 2010, leg. Qian et al.

Paratypes. ad.9 (female), The Sea of bamboos, Jiangsu, 24 May 2010, leg. Qian et al.

Paratypes. ad.9 (female), Laoshan Mountain, Jiangsu, 23 September 2011, leg. Qian et al.

Diagnosis. Shape of the anal plate indicates that this new species is close to Stylopauropoides hetaerosr Scheller 2009 from Big Sassy Creek, Australia. Their anal plates are divided longitudinally by a V–shaped incision into two branches, and with distal short inner process directed obliquely inwards. But these two species can be clearly distinguished by the character of the antennae, which divided them into distinct genus. Having no shortstalked distal appendage present on each branch in D. bidrepanoides differs from S. hetaerosr .

Etymology. From the Latin bi - = two and drepanoides = falciform (referring to the shape of the anal plate).

Description. Length. (0.56–)0.59(–0.64) mm

Head. Tergal setae of short to medium length, subcylindrical, densely annulate, blunt. Relative lengths of setae, 1st row: a 1=10, a 2=10(–11); 2nd row: a 1=10(–12), a 2=(8–)9(–10), a 3=8(–9); 3rd row: a 1=(14–)17(–18), a 2=(19–)21(–22); 4th row: a 1=(11–)12(–13), a 2=(22–)24(–26), a 3=(21–)24(–?), a 4=(?–)17(–18); The ratio a 1/ a 1– a 1 in 1st row 0.9(–1.0), 2nd row 0.56(–0.79), 3rd row (1.3–)1.4 and 4th row (2.5–)2.8(–3.0). Temporal organs oval in tergal view, their length 1.5 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' =(74–)81.5, p'' =(37–)48, r =30(–37); Tergal seta p (0.6)0.7 of length of tergal branch t. The latter fusiform, 4.3(3.9) times as long as its greatest diameter and 1.5(1.8) times as long as sternal branch s; that branch 2.8(2.4) times as long as its greatest diameter; anterodistal corner of s truncate. Seta q cylindrical, annulate, blunt, 1.1 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. (1.1–)1.2 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 clavate, striate, distal segment large, rudiments of secondary branches probably absent. Sublateral setae 1.6 times as long as submedian ones; sternite process triangular, blunt; appendages narrowing distally and with flat caps, glabrous. Setae on tergites thin, cylindrical, on anterior tergites as on head, on posterior tergites tapering pointed with short pubescence distally; 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(–95), T 3=110(–122), T 4=(120–)125(–130), T 5=(160–)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, 3.0 times as long as its greatest diameter. Setae subsimilar, thin, cylindrical, with short pubescence. their length 0.3 of length of tarsus. Cuticle of tarsus with very delicate pubescence on the distal and terminal.

Pygidium. Tergum. Posterior margin between st straight. Relative lengths of setae: a 1=100, a 2=(89–)100(–105), a 3=(126–)132(–137), st =(47–)53. All setae point, thin, glabrous; distance a 1 –a 1 1.0(–1.1) times as long as a 1; distance a 1– a 2 1.6(–1.7) times as long as a 2– a 3; distance st – st (3.0–)3.2(–3.4) times as long as st and (1.5–)1.6 times as long as distance a1 – a1.

Sternum. Posterior margin with shallow indication between b 1. Relative lengths of setae (a 1=100): b 1=(237–)253(–263), b 2=(105–)116(–121). All setae subcylindrical, blunt, point. Distance b 1– b 1 (0.74–)0.78(–0.88) of length of b 1; distance b 1– b 2 1.3(–1.75) times as long as b 2.

Anal plate. 0.3 times of length of broad, hemispherical, lateral margins rounded, globrous; from distal part of anal plate, two curved inwards, pincerlike appendages, 2.9 times as long as plate, appendages with short oblique pubescence.

Figures

FIGURE 4. Decapauropus bidrepanoides sp. nov. holotype (female). A, head, submedian and right part, tergal view. B, right antenna, ventral view. C, collum segment, median and left part, sterna view. D, T 3. E, seta on trochanter of leg 9. F, tarsus of leg 9. G, pygidium, sternal view.