Decapauropus brevilingulus, Scheller, Ulf, 2011

Scheller, Ulf, 2011, New records of Pauropoda (Myriapoda) from north-western Thailand, International Journal of Myriapodology 4, pp. 51-77 : 57-59

Decapauropus brevilingulus sp. n. Figs 20-27

Material.

Holotype ad. 9(♀), Thailand, Chiang Mai province, Doi Inthanon, below the top, alt. 2400 m, 1991.vii.8, loc. CM-243.

Etymology.

From the Latin brevis, short, and lingua, tongue (referring to the shape of the anal plate).

Diagnosis.

Decapauropus brevilingulus sp. n. is well defined by its unique short linguiform anal plate in combination with a distinct semicircular lobe between the pygidial setae st and longish antennal globulus with ovoid capsule. At present its relationships can not be traced.

Description.

Length. 0.55 mm. Head (Fig. 20). Setae on the tergal side thin annulate. Relative lengths of setae, 1st row: a1=10, a2=?; 2nd row: a1=10, a2=11, a3=14; 3rd row: a1=?, a2=10; 4th row: a1=9, a2=a4=11, a3=13; lateral group setae not studied. Ratio a1/a1-a1 in 1st row 1.4, 2nd row 0.5, 3rd row?, 4th row 1.3. Temporal organs small, ovoid in tergal view, length 0.6 of their shortest distance apart; small pore near posterior margin. Head cuticle glabrous.

Antennae (Fig. 21). Segment 4 with at least four setae, all thin cylindrical annulate blunt; their relative lengths: p=10, p’ =7, p’’ =6, r=5. Tergal seta p 0.8 of the length of tergal branch t. The latter proportionally short, somewhat fusiform, twice longer than thick and 0.8 of the length of sternal branchs,that branch 1.9 times as long as its great est diameter; anterodistal corner distinctly truncate. Seta q thin cylindrical annulate, ≈0.5 of the length of s. Relative lengths of flagella (basal segments included) and basal segments: F1=100, bs1=5; F2=38, bs2=6; F3=85, bs3=8. F1 5.5 times as long as t, F2 and F3 1.6 and 3.6 times as long as s respectively. Distal calyces somewhat flattened, distal part of flagella axes widened fusiformly below calyces. Globulus g longish, 1.5 times as long as greatest diameter, bracts and capsule proportionally long, 7 bracts; g as wide as the greatest diameter of t. Antennae glabrous.

Trunk. Setae of collum segment (Fig. 22) simple cylindrical blunt striate, sublateral and submedian setae of the same length; sternite process triangular, pointed anteriorly; appendages subspherical with flat caps. Process and appendages glabrous.

Most setae on tergites not available for study, those studied similar to those on head, 4+4 setae on tergite I, 4+2 on VI.

Bothriotricha. Most bothriotricha broken; T3 (Fig. 23) with proximal 2/3 somewhat thickened, pubescence distinct, oblique on thickened part, erect distally; T5 thin with very faint oblique pubescence.

Legs (Figs 24, 25). Setae on coxa (Fig. 24) and trochanter of all legs simple cylindrical striate. Tarsus of leg 9 (Fig. 25) tapering, 4.8 times as long as its greatest diameter; setae thin, proximal one curved tapering pointed glabrous, distal one subcylindrical blunt striate, proximal seta 0.2 of the length of tarsus and 1.3 times as long as distal seta. Cuticle of tarsus glabrous.

Pygidium (Figs 26, 27). Tergum. Posterior margin with large semicircular lobe between st. Setae a2 and a3 distinctly shorter than a1; relative lengths of setae: a1=10, a2=6, a3=7, st=3; a-setae directed posteriorly, proportionately long, tapering glabrous; a1 straight, a2 and a3 curved inward. Distance a1-a1 as long as a1, distance a1-a2 3.3 times as long as distance a2-a3; distance st-st 1.8 times as long as st and 0.8 of distance a1-a1.

Sternum. Posterior margin with shallow indentation between b1. Relative lengths of setae (pygidial a1=10): b1=16, b2=7, setae thin tapering, b1 indistinctly striate in distal half, 1.2 times as long as interdistance, b2 as long as distance b1-b2.

Anal plate horizontal, narrowest anteriorly, somewhat broader than long, shortly linguiform, distal margin somewhat thickened at posterior margin; no appendages.