Borneopauropus platylopas, Scheller, Ulf, 2011

Scheller, Ulf, 2011, New records of Pauropoda (Myriapoda) from north-western Thailand, International Journal of Myriapodology 4, pp. 51-77 : 66-69

Borneopauropus platylopas sp. n. Figs 61-71

Material.

Holotype ad. 9(♂), Thailand, Chiang Mai province, Doi Inthanon, Mae Chaem road, secondary dry forest, litter, alt. 1150 m, 1992.vi.30, loc. CM-080. - Paratype, ad. 9(♀), ibidem, loc. CM-194. - 2 specimens.

Etymology.

From the Greek platys, broad, and lopas, plate (referring to the unusually broad anal plate).

Diagnosis.

Up to now four species have been described in the genus, one from Sulawesi in Indonesia, two from Sabah and one from Tasmania. Borneopauropus platylopas has most characters in common with the Indonesian species, Borneopauropus curtipes Scheller ( Scheller 2009) and one of the two species from Sabah, Borneopauropus penanorum Scheller ( Scheller et al. 1994). It can be distinguished from both by the shape of the bothriotricha T3, clavate part moderately widened with long distal flagellum in Borneopauropus platylopas , not strongly widened and with shorter flagellum in Borneopauropus curtipes and Borneopauropus penanorum , and by the shape of the pygidial setae a3, long thin tapering, not bladder-shaped, and the shape of the anal plate, broad triangular, not longish linguiform.

Description. Length. (0.51-)0.58 mm. Head (Fig. 61). Tergal and lateral sides with 26 setae arranged as in Fig. 61; transversal rows indistinct laterally. Setae longest in posteromedian part; all but lateral setae clavate, shortly pubescent, lateral group setae cylindrical annulate. Temporal organs small with at least two short uplifted extensions. Head cuticle glabrous.

Antennae (Fig. 62). Segment 4 with 4 cylindrical annulate setae; relative lengths: p=10, p´ =11(-12), p´´ =4(-6), r=4. Tergal seta p 0.6 of the length of tergal branch t. The latter subcylindrical, (2.6-)2.9 times as long as wide, 0.9 of the length of sternal branch s. That branch thickest in distal third and with anterodistal corner somewhat more truncated than posterodistal corner; s (2.0-)2.1 times as long as greatest diameter, its seta q cylindrical striate, 0.5 of the length of s. Relative lengths of flagella (base segments included) and base segments: F1=100, bs1=8; F2=(65-)66, bs2=6; F3=72(-74), bs3=(7-)8. F1 3.1 times as long as t, F2 and F3 (1.9-)2.2 and (2.0-)2.3 times as long as s respectively. Distal calyces helmet-shaped, glabrous. Globulus g, (1.6-)1.8 times as long as greatest diameter, the latter (0.9-) as long as greatest diameter of t. Antenna glabrous.

Trunk (Figs 63-65). Setae of collum segment (Fig. 63) simple cylindrical blunt annulate; sublateral seta 1.2 times as long as submedian seta. Sternite process blunt-ended; appendages barrel-shaped with low caps; process and appendages glabrous.

Tergites (Figs 64, 65), I, V, VI entire, II, III, IV transversely and weakly 2-parted. Number of setae on tergites (holotype only, if two groups of values anterior and posterior groups of setae respectively): I 30, II 19+20, III 28+21, IV 25+19, V 20+13, VI 4+2. Setae bladder-shaped with short oblique-erect pubescence, setae lengthening posteriorly, those on VI (Fig. 65) about twice longer than those on I. Cuticle of tergites glabrous.

Bothriotricha (Figs 66, 67). Relative lengths: T1=100, T2=108(-110), T3=(122-)146, T4=(89-)113, T5=(140-)144. Axes simple, most proximally glabrous; proximal half of T3 (Fig. 66) strongly clavate with short pubescence arranged in dense whorls, distal half very thin; other bothriotricha (Fig. 67) with thin and curved axes; pubescence short oblique on proximal parts, erect distally.

Genital papillae (Fig. 68). Short, as long as wide, seta 0.5 of the length of papilla.

Legs (Figs 69, 70). All legs 5-segmented. Setae on coxa (Fig. 69) and trochanter of legs 1-9 simple, cylindrical annulate blunt, rudimentary secondary branch only on coxal setae of leg 2 in male. Tarsus of leg 9 (Fig. 70) short, almost cylindrical, (2.9-)3.4 times as long as greatest diameter; setae short cylindrical annulate, proximal one 0.1 of the length of tarsus and (0.5-)0.6 of the length of distal seta. Cuticle of tarsus glabrous.

Pygidium (Fig. 71). Tergum. Hind margin rounded. Relative lengths of setae: a1=10, a2=(13-)14, a3=(22-)25, st rudimentary. a1 bladder-shaped, faintly pubescent, a2 longish clavate, distinctly pubescent, somewhat curved inward, a3 thin tapering, faintly striate, curved inward. Distance a1-a1 1.5 times as long as a1, distance a1-a2 twice longer than distance a2-a3; distance st–st ≈25 times as long as st and 0.6 of distance a1-a1.

Sternum. Posterior margin between b1 rounded but with large lobe below anal plate; lobe with median indentation and rounded posterolateral corners. Relative lengths of setae (pygidial a1=10): b1=(40-)43, b2=13(-16), b3=7. b1 thin tapering, blunt, striate distally, b2 and b3 cylindrical. b1 (1.3-)1.4 times as long as distance b1-b1, b2 0.7(-0.9) of distance b1-b2 and b3 0.3(-0.4) of distance b3-b3.

Anal plate (Fig. 71) narrowest anteriorly, triangular, posterolateral corner turned anteriorly and posterior margin with small median process, two cylindrical blunt faintly pubescent appendages protruding backward from sternal side just nearby the posteromedian process, length of appendages somewhat longer than plate.