Stylopauropus longus, Scheller, Ulf, 2014

Scheller, Ulf, 2014, New records of Pauropoda (Myriapoda) with descriptions of new taxa, Zootaxa 3866 (3), pp. 301-332 : 320-322

Stylopauropus longus n. sp.

Figs 38–46

Type specimen. Holotype: ad. 9 (♀), Russia, Far East, Magadan, Snezhnaya Dolina (Snow Valley), 59.73ºN, 150.85ºE., under rotten Larix bark, July 21, 1979, A. Fjellberg leg. Type specimen deposited in the Zoological Museum, University of Lund, Sweden.

Diagnosis. S. longus n. sp. may be closest to Stylopauropus californianus Remy and S. boreus Scheller ( Remy 1958, Scheller 1988a) from eastern Nearctic, the former from California, British Columbia, southern Appalachians and NE Siberia and the latter from Alaska. They have distinct similarities in the shape of the pygidial tergum and its setae, but are easily distinguished from the new species by the shape of the two posterior submedian appendages of the anal plate, curved distally and twice longer than the plate in the new species, straight and as long as the plate in S. californianus and S. boreus. Moreover the genital papillae in S. californianus are proportionally longer, and the sternite process of the collum segment is evenly rounded in S. boreus, not with apical incision.

Derivation of name. From the Latin longus = long (referring to the very long posteriomedian appendages of the anal plate.

Description. Length. 0.77 mm.

Head (Fig. 38). Head short, tergal setae pubescent, all but a 3 in 2nd row and l -group setae longish, clavate. Relative lengths of setae, 1st row: a 1 = 10; a 2 = 12; 2nd row: a 1 = 11, a 2 = 17, a 3 = 23; 3rd row: a 1 = a 2 = 12; 4th row: a 1 = 15, a 2 = 25, a 3 = a 4 = 17; lateral group: l 1 = l 2 = 12, l 3 = 17. The ratio a 1 /a-a 1 in 1st row 1.7, 2nd row 0.7, 3rd row 0.6, 4th row 1.2. Temporal organs mainly lateral, their length in tergal view 0.7 of shortest interdistance. Head cuticle glabrous.

Antennae (Fig. 39). Segment 3 with 3 setae and rudimentary globulus g´on distal part of tergal side. Segment 4 with 5 thin, cylindrical, densely striate setae, r thinnest, u and p ''' rudimentary. Relative lengths of setae: p = 100, p ' = 71, p '' = 24, r = 22. Tergal seta p 1.1 times as long as tergal branch t. The latter cylindrical, 4.4 times as long as its greatest diameter and 0.9 of the length of sternal branch s, that branch 2.7 times as long as its greatest diameter and with distinct but short posterodistal truncation, branch length 1.3 times as long as its seta q. Relative lengths of flagella (with base segments included) and base segments: F 1 = 100, bs 1 = 6, F 2 = 40, bs 2 = 3, F 3 = 70, bs 3 = 6. F 1 2.9 times as long as t, F 2 and F 3 1.1 and 1.7 times as long as s respectively. Distal calyces subhemispherical, glabrous, those of F 2 smallest. Globulus g 2.9 times as long as its greatest diameter; ≈11 bracts; capsule longer than wide. Diameter of g 0.7 of the greatest diameter of t. Antennae glabrous.

Trunk (Figs 40, 41). Setae of collum segment (Fig. 40) not available for study. Sternite processes with almost parallel sides and incised anteriorly; appendages barrel-shaped with thick caps. Process and appendages glabrous. Setae on anterior tergites as on median part on head but posteriorly growing thinner, on tergite VI thin, tapering, pointed. Tergite I with 4+4 setae, II–V with 6+6, VI with 4+2. Posterior setae on VI (Fig. 41) long, 1.4 times as long as interdistance and 1.8 times as long as pygidial setae a 1. Tergites glabrous.

Genital papillae (Fig. 42). Conical, with slight indentation on inner side, 1.7 times as long as greatest diameter, seta thin 0.2 of the length of papilla. Seta on coxa of leg 2 not available for study.

Bothriotricha (Fig. 43). Relative lengths: T 1 = 100, T 2 = 108, T 3 = 154 and 158, T 4 = 142, T 5 = 205. All with thin simple straight axes, T 3 (Fig. 43) thickest, particularly in proximal ¾; pubescence consisting of simple, straight, short hairs, oblique on most proximal parts, outwards erect.

Legs (Figs 44, 45). Setae on coxa (Fig. 44) and trochanter of legs 9 thick blunt, very shortly pubescent, probably simple. Tarsus of leg 9 (Fig. 45) straight, tapering, 4.3 times as long as its greatest diameter. Proximal seta long, tapering, pointed, with short oblique pubescence, 0.5 of the length of tarsus and 3.0 times as long as cylindrical, striate, distal seta. Cuticle of tarsus almost glabrous.

Pygidium (Fig. 46). Tergum: Posterior part broadly triangular. Setae thin with short oblique pubescence; their relative lengths: a 1 = 10, a 2 = 8, a 3 = 11, st = 2; a- setae thin, indistinctly pubescent, directed posteriorly, a 1 straight, a 2 and a 3 somewhat curved inwards, the former also converging, st short clavate. Distance a 1 -a 1 0.7 of interdistance, distance a 1 -a 2 1.2 times as long as distance a 2- a 3; distance st-st 6 times longer than st and 1.7 times as long as distance a 1 -a 1. Cuticle glabrous.

Sternum: Setae b 1 thin, cylindrical, blunt, posterior margin in between with broad low bulge. Relative lengths of setae (pygidial a 1 = 10): b 1 = 19; these setae 1.3 times as long as interdistance.

Anal plate broader than long with strongly convex lateral margins; posterior margin with three V-shaped incisions, a narrow median one and two broader sublateral ones; posterolateral corners triangular; two very long, thin, cylindrical appendages, curved in distal half, protruding backwards from each side of posteriomedian incision; plate glabrous but long appendages with coarse surface.

FIGURES 38–46. Stylopauropus longus n. sp., holotype, ad. 9 (♂). 38. Head, median and right part. 39. Left antenna, sternal view. 40. Median part of collum segment. 41. Posteromedin part of tergite VI with insertion of right bothriotricha T 5. 42. Right genital papilla, anterior view. 43. T 3. 44. Seta on trochanter of leg 9. 45. Tarsus of leg 9. 46. Pygidium, posteriomedian part. Scale a: 43, 45; b: 38. 39, 41, 42, 44; c: 40, 46.