Angkapauropus leptotrichos, Scheller, Ulf, 2011

Scheller, Ulf, 2011, New records of Pauropoda (Myriapoda) from north-western Thailand, International Journal of Myriapodology 4, pp. 51-77 : 64-66

Angkapauropus leptotrichos sp. n. Figs 53-60

Material.

Holotype ad. 9(♀), Thailand, Chiang Mai province, Doi Inthanon, Mae Chaem road, secondary dry forest, litter, alt. 1150 m, loc. CM-084. - Paratype, ad. 9(♀), ibidem, loc. CM-086. - 2 specimens.

Etymology.

From the Greek leptos, thin, and trichos, hair (referring to the shape of the setae on head, antennae and legs.

Description.

Length. 0.54(0.56) mm. Head (Fig. 53). Setae on tergal side short thin cylindrical striate. Relative lengths of setae (holotype only), 1st row: a1=10, a2=13; 2nd row: a1=?, a2=13, a3=10; 3rd row: a1=7, a2=13; 4th row: a1=13, a2=17, a3=20, a4=13; lateral group setae not studied. Ratio a1/a1-a1 in 1st row 0.6, 2nd row?, 3rd row 0.2, 4th row 0.4. Temporal organs large, in tergal view ovoid, length as long as their shortest interdistance. Pore not ascertained. Head cuticle glabrous.

Antennae (Fig. 54). Segment 4 with five cylindrical striate setae; their relative lengths: p=10, p’ =(8-)9, p’’ =r=5, p’’’ =3. Tergal seta p 0.6(-0.7) of the length of tergal branch t. The latter fusiform with distal end cut obliquely, (2.4-)2.6 times as long as its greatest diameter and (1.0-)1.2 times as long as the length of sternal branchs,that branch 1.6 times as long as its greatest diameter; anterodistal corner distinctly truncate. Seta q cylindrical striate, almost as long as the length of s. Relative lengths of flagella (basal segments included) and basal segments: F1=100, bs1=9(-10), F2=45(-52), bs2=4(-5); F3=87(-91), bs3=5, curved. F1 4.2(-4.7) times as long as t, F2 and F3 1.8 and 4.4(-4.5) times as long as s respectively. Distal calyces conical, distal part of flagella axes not widened below calyces. Globulus g shortly pyriform, as long as wide, ≈10 bracts, capsule somewhat flattened; width of g as long as the greatest diameter of t. Antennae glabrous.

Trunk (Figs 55, 56, 60). Setae of collum segment (Fig. 55) short simple cylindrical annulate, sublateral setae 1.2 times as long as submedian setae; sternite process triangular; appendages cylindrical, diameter of caps distinctly shorter than top of appendage. Process and appendages glabrous.

Setae on tergites short cylindrical, numerous and irregularly inserted on I-V, ≈40 setae on I (Fig. 56), ≈15 on V, setae on VI in two transversal rows, 6 ones in anterior row and 4 ones in posterior row. Submedian posterior setae on VI (Fig. 60) 0.1 of interdistance and as long as the length of pygidial setae a1.

Bothriotricha (Fig. 57). Relative lengths: T1=100, T2=?, T3=74(-80), T4=91(-105), T5=117(-124); axes simple straight, very thin and with faint pubescence only distally on T1, T2 and T5, T3 only (Fig. 57) stronger, with longish cylindrical end-swelling, 1/3 of the length of bothriotrix, distinct but sparse oblique pubescence.

Legs (Figs 58, 59). Setae on coxa (Fig. 58) and trochanter of legs 1-9 simple thin cylindrical annulate. Tarsus of leg 9 (Fig. 59) subcylindrical, only somewhat tapering, 3.0 times as long as its greatest diameter; setae very thin, cylindrical annulate, proximal seta 0.1 of the length of tarsus and as long as distal seta. Cuticle of tarsus glabrous.

Pygidium (Fig. 60). Tergum. Posterior margin with distinct posterior lobes outside setae st, in between straight. Relative lengths of setae: a1=st=1, a2=3, a3=15. Setae very different, a1 short clavate, a2 short lanceolate, diverging, a3 long tapering, curved inwards, diverging, st short clavate, converging. Distance a1-a1 (5.7-)6.7 times as long as the length of a1, distance a1-a2 (3.2-)3.7 times as long as distance a2-a3; distance st-st 8(-9) times as long as st and 1.1(-1.5) times as long as distance a1-a1.

Sternum. Posterior margin almost straight between insertion areas of setae b1, no lobe below anal plate. Relative lengths of setae (pygidial a1=1): b1=9(-10), b2=3, setae tapering pointed, glabrous, b1 0.6(-0.9) of the length of interdistance, b2 0.6 of the length of distance b1-b2.

Anal plate broadest anteriorly, distinctly longer than broad, lateral margins concave, each posterior corner with long thin subcylindrical appendage protruding backward and somewhat curved inward; between these appendages a shorter one protruding backward from tergal side, long appendages almost as long as plate, shorter one 0.7 of the length of plate.