Donzelotauropus dividuus, 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 : 42-45

Donzelotauropus dividuus n. sp.

Figs 21–28

Type locality. U.S.A., Great Smoky Mountains National Park, North Carolina, Swain Co., Balsam Mountain Road, 4 km from south entrance, 3537,445N, 8310.761W, west-facing slope, deciduous forest with Acer rubrum, Halesia carolina, Fagus grandiflora, Hamamelis virginiana, under bark on dead tree, 24 September 2002, leg. U. Scheller, E.Bernard, I. Stocks.

Type material. Holotype: ad. 9(3), data as above. Paratypes: 3 ad. 9(Ƥ), 2 subad. 8(Ƥ), 1 juv. 6, 1 juv. 5, 2 juv. 3, Tennessee, Sevier Co., above Laurel Falls, in soil under large poplars (Lirodendron tulipifera), 11 November 2004, leg. W. Reynolds & E. Gileh.— 11 specimens.

FIGURES 21–28. Donzelotauropus dividuus sp. n., holotype, 3. 21, head, submedian and right part, tergal view. 22, right antenna, tergal view. 23, collum segment, median and left part, sternal view. 24, genital papillae and seta on coxa of leg 2, anterior view. 25, seta on trochanter of leg 9. 26, tarsus of leg 9. 27, posterior part of tergite VI and median and right part of pygidial tergum, tergal view. 28, posterior part of pygidial sternum showing the placing of setae b 1 and b 3. Scale a: 24; b: 21, 25–27; c: 22, 23, 28.

Diagnosis. Though this species has only one pair of setae on the pygidial sternum, b 1, and thus has to be placed in Donzelotauropus , it shows many similarities with a species in Stylopauropus earlier described from Great Smoky Mountains, Stylopauropus sulcatoidus Scheller (Scheller & Bernard, 2005). They resemble each other in the shape of the antennal globulus g, the bothriotricha, the general plan of the anal plate and the shape of the posterior part of the pygidial tergum and its setae. However, besides the presence of the b 1 D. dividuus is easily distinguished from S. sulcatoidus by the proportion q/s, 0.9, not 0.5 and the shape of the posterior part of the anal plate, incision deep U-shaped and appendages curved inwards and distinctly pubescent, not incision shallow, broadly Vshaped and appendages straight, faintly pubescent.

Derivation of name. From the latin dividuus = divided into two parts (referring to the shape the anal plate).

Description. Length (0.71–) 1.06 mm.

Head (Fig. 21). Tergal setae mainly clavate blunt, with pubescence in whorls, a 3 in 2nd row and the l -group tapering, pointed pubescent, a 4 in 4th row cylindrical. Relative lengths of setae, 1st row: a 1=10; a 2=12; 2nd row: a 1=10(13), a 2=12(–14), a 3=15(–17); 3rd row: a 1=10(–11), a 2=?(–13); 4th row: a 1=(11–)16, a 2=(14–)20, a 3=15(–16), a 4=(10–)12; l 1=18(–21), l 3=17(–18), l 3=?(13). The ratio a 1 /a 1 -a 1 is in 1st row 1.1(–1.2), in 2nd row 0.5, in 3rd row 0.5(–0.6), in 4th row (0.9–)1.1. Temporal organs large, their length in tergal view 1.1(–1.2) times as long as shortest interdistance; pore with canal posteriorly. Head cuticle glabrous.

Antennae (Fig. 22). Segment 3 with 2 subcylindrical setae and rudimentary g', the latter oblique distally. Segment 4 with 5 cylindrical setae, all but r pointed, u rudimentary. Relative lengths of setae: p =100, p ΄=75(–87), p" =(45–)47, r =25(–31). Tergal seta p 0.7 of the length of tergal branch t. The latter fusiform, 3.7(–4.0) times as long as its greatest diameter and 1.2(–1.3) times as long as sternal branch s, the latter 2.1(–2.5) times as long as its greatest diameter and with its posterodistal corner distinctly truncate. Seta q as tergal-anterior setae of 4th segment, 0.9 of the length of s. Relative lengths of flagella (with base segments included) and of base segments alone: F 1=100, bs 1=17, F 2=78(80), bs 2=17, F 3≈100, bs 3=18(19). The F 1 (2.5–)2.7 times as long as t, F 2 and F 3 3.1 and (1.2–)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 with thick stalk, (1.9–)2.1 times as long as its greatest diameter; ≈10 bracts, these partly bifurcate; capsule subspherical. Diameter of g as long as greatest diameter of t. Antennae glabrous.

Trunk. Setae of collum segment (Fig. 23) leaf-shaped blunt, indistinctly pubescent, furcate with rudimentary secondary branches; the latter blunt glabrous; sublateral seta 1.2 times as long as submedian seta. Sternite process proportionately broad, anterior part divided into two rounded lobes by a shallow median incision; appendages stump-like, caps flat low. Process with distinct pubescence, appendages glabrous.

Setae on anterior tergites as submedian setae on tergal side of head, posteriorly growing subcylindrical; 4+4 setae on tergite I, 6+6 setae on II–V, 4+2 on VI (Fig. 27). Posterior setae on VI somewhat clavate pubescent, 0.3(– 0.4) of interdistance and 1.3 times as long as the length of pygidial setae a 1. Tergites glabrous.

Bothriotricha. Relative lengths: T 1=100, T 2=(96–)105, T 3=104(–111), T 4=110(–126), T 5 =126(–158). Axes thin simple straight, T 3 thickest; pubescence of simple straight hairs, oblique on most proximal parts, outwards erect on T 1 and T 2.

Genital papillae (Fig. 24). Longish, proximal half cylindrical, roundly conical distally, base two-parted, setae thin, 0.5 of the length of papilla.

Legs (Figs 25, 26). Setae on coxa and trochanter (Fig. 25) of leg 9 furcate, main branch folioform, secondary branch clavate, both faintly pubescent. These setae on more anterior legs with broadly folioform main branch and rudimentary secondary branch. Tarsus of leg 9 (Fig. 26) tapering, (3.4–)3.5 times as long as the greatest width. Proximal seta tapering pointed, with depressed pubescence, 0.5 of the length of tarsus and 4.2 times as long as cylindrical blunt striate distal seta.

Pygidium (Figs 27, 28). Tergum (Fig. 27). 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 glabrous except in the middle of posterior indention between st, there dense, erect pubescence.

Sternum (Fig. 28). 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 glabrous.

Anal plate about as broad as long, subcircular, lateral margins convex, U-shaped posterior incision with depth about half of the length of plate, posterior corners each with a small swelling; pubescence sparse but distinct, most prominent on swellings.