Donzelotauropus tenuitarsus, Scheller, Ulf, 2011

Scheller, Ulf, 2011, Pauropoda (Myriapoda) from Great Smoky Mountains National Park, U. S. A., with descriptions of four new species, Zootaxa 2962, pp. 36-48 : 45-47

Donzelotauropus tenuitarsus n. sp.

Figs 29–36

Type locality. Tennessee, Sevier Co., Appalachian Trail, 350 m east of Road Prong trailhead, 3536.707N, 8328.033W, steep slope at log gate, under rotten log, 17 September 2002, U. Scheller.

Type material. Holotype: ad. 9(Ƥ), data as above. Paratype: 1 ad. 9(Ƥ), same data as holotype.

Nontype material. Tennessee, Sevier Co., Ramsey Cascades Trail, 35º37ʹ75"N, 83º51ʹ62"W, leaf litter, 1 ad. 9(Ƥ), 1 2002, leg. J.P. Gruber. – 3 specimens.

Diagnosis. There are characters in the antennae, collum segment, legs, pygidial tergum and anal plate which connect D. tenuitarsus n. sp. to D. diffisus Scheller from Alaska ( Scheller 1986). The following can be used for their distinction: calyces of antennal flagella glabrous in D. tenuitarsus , distincrly pubescent in D. diffisus, 4th antennal segment with 6 setae, not 4, antennal seta p longer than antennal branch t, not shorter than, caps of collum processes thin, not distinctly vaulted, tarsus of leg 9 at least 7 times longer than wide, not 5–6, and the proportion b 3/ b 3- b 3 1.1 times longer than distance b 3- b 3, not 0.5-0.8 of that distance.

Description. Head (Fig. 29). Setae on tergal side subcylindrical, with oblique pubescence, a 3 in 2nd row and l - group thin pointed. Relative lengths of setae, 1st row (holotype only): a 1=10; a 2=12; 2nd row: a 1=?, a 2=16, a 3=8; 3rd row: a 1=11, a 2=14; 4th row: a 1=16, a 2=?, a 3=?, a 4=7; l 1= l 3=16, l 2=11. The ratio a 1 /a 1 -a 1 is in 1st row 1.4, in 2nd row?, in 3rd row 0.8, in 4th row 1.2. Temporal organs large, as long as their shortest interdistance; posterior pore not ascertained. Head cuticle glabrous.

Antennae (Fig. 30). Segment 4 with 5 cylindrical setae, all blunt, obliquely pubescent. Relative lengths of setae: p =100, p ΄=(92–)95, p" =(25–)29, p ΄΄΄=20, r =17, u= 9. Tergal seta p as long as (–1.2 times as long as) the length of tergal branch t. The latter branch fusiform, 5.0 times as long as its greatest diameter and 1.2(–1.4) times as long as sternal branch s, that branch 2.9(–3.0) times as long as its greatest diameter and with its posterodistal corner deeply truncate. Seta q as p ʹ of 4th segment, almost as long as s. Relative lengths of flagella (with base segments included) and of base segments alone: F 1=100, bs 1=16, F 2=(74–)80, bs 2=16, F 3≈60, bs 3=18. The F 1 2.2(–2.4) times as long as t, F 2 and F 3 2.0 and 1.4 times as long as s respectively. Distal calyces glabrous, on F 1 conical, longer than wide, other calyces with rounded tips. Globulus g 3.3 times as long as its greatest diameter, stalk curved; ≈12 bracts, partly bifurcate; capsule subspherical. Diameter of g 0.9 of the greatest diameter of t. Antennae glabrous.

Trunk (Figs 31, 32). Setae of collum segment (Fig. 31) narrowly leaf-shaped, distinctly pubescent, furcate with rudimentary blunt glabrous secondary branch; sublateral seta 1.2 times as long as submedian seta. Sternite process very broad anteriorly, there divided into two rounded lobes by a shallow median incision; appendages flattened low, caps thin, inconsiderably vaulted. Process with distinct pubescence, appendages glabrous.

Setae on anterior tergites as submedian setae on tergal side of head, increasing in length posteriorly; 4+4 setae on tergite I, 6+6 setae on II–V, 4+2 on VI. Posterior setae on VI (Fig. 32) tapering pointed, with sparse depressed pubescence, 1.8 times as long as interdistance and 1.4 times as long as the length of pygidial setae a 1.

Bothriotricha. Relative lengths (paratype): T 1=100, T 2=135, T 3=161, T 4=184, T 5=323. Axes thin simple straight, pubescence of simple straight hairs, oblique on most proximal parts, outwards erect on T 1 and T 2, sparse on T 5.

Legs (Figs 33, 34, 36). Long slender, leg 9 (Fig. 34) at least twice longer than leg 1. Setae on tibiae and proximal seta on tarsi long outstanding. Setae on coxa and trochanter (Fig. 33) of leg 9 thickest at base, furcate, branches cylindrical, main branch thick, secondary branch thin, both distinctly pubescent. These setae on more anterior legs with broadly folioform main branch and rudimentary glabrous secondary branch. Tarsus of leg 9 (Fig. 34, 36) slen- der tapering, (6.1–)7.4 times as long as the greatest width. Proximal seta tapering pointed, with a few pubescence hairs only, 0.4 of the length of tarsus and 4.0(–4.5) times as long as cylindrical blunt striate distal seta.

FIGURES 29–36. Donzelotauropus tenuitarsus sp. n., holotype, Ƥ. 29, head, submedian and right part, tergal view. 30, right antenna, tergal view. 31, collum segment, median and left part, sternal view. 32, tergite VI, posteriomedian part. 33, seta on trochanter of leg 9. 34, leg 9, tibia and tarsus, anterior view. 35, pygidium, median and right part, sternal view. 36, posterior part of trunk with pygidium, leg 9 and bothriotrix T 5. Pubescence only partly drawn in 36. Scale a: Figure 36; b: Figure 34; c: Figures 31, 33; d: Figure 32; e: Figures 29, 30, 35, 36.

Pygidium (Figs 34, 35, 36). Tergum (Fig. 35). Posterior part with broad indention between st. Relative lengths of setae: a 1=10, a 2 =(14–)16, a 3=(15–))16, st =(7–)8. a -setae tapering pointed pubescent, st thin cylindrical glabrous (in one of the paratypes pubescent and cleft apically), a 1 straight, directed upwards-outwards, a 2, a 3 and st curved inwards, the latter also converging. Distance a 1 -a 1 2.1 times as long as a 1, distance a 1 -a 2 5.0(–8) times as long as distance a 2- a 3; distance st-st 2.7(–2.8) times as long as st and as long as distance a 1 -a 1. Cuticle with short dense pubescence.

Sternum (Fig. 35). Posterior margin between b 1 straight. Relative lengths of setae (pygidial a 1=10): b 1=(24–)28(–30), b 3=(7–)8. Setae cylindrical, b 1 tapering glabrous, b 3 cylindrical pubescent; the latter placed near the posterior margin of sternum; b 1 1.1 times as long as interdistance, b 3 1.0(–1.1) times as long as interdistance. Sternum. Cuticle with short dense pubescence.

Anal plate (Fig. 35) about as broad as long, lateral margins concave, large U-shaped posterior incision, depth about half of the length of plate, posteriolateral corners lengthened into cylindrical blunt diverging appendages, length about as long as ¾ of the length of plate, these appendages also somewhat curved inwards; at each side of Ushaped incision a thinner cylindrical blunt appendage pointing backwards, length as long as plate; plate and appendages shortly pubescent, most distinctly on appendages.