Stylopauropoides scissus, Scheller, 2009

Scheller, Ulf, 2009, New species of Pauropoda (Myriapoda) from Tasmanian temperate rainforests, Memoirs of Museum Victoria 66 (2), pp. 289-329 : 316-318

Stylopauropoides scissus sp.nov.

( Figs.142–154 )

Material Examined. Holotype. Ad. 9 (male), Savage River Pipeline Road , Loc. 1, (41°18.5'S, 145°16.3'E), litter, 21.iv.1989 ( PG).

Paratypes. Same data as holotype, 1 ad. 9 (male), 1 juv. 6. Mount Michael, Loc. 6, (41°10.9'S, 148°00.4'E), in moss on log, 1 ad. 9 (male), 1 subad. 8 (female), 11.vi.1990 ( ATW). Projection Bluff, Loc. 3, (146°43.5'S, 41°43.1'E), in soil cores, 13 ad. 9 (8 male, 5 female), 2 subad. 8 (female), 2 juv. 6, 2 juv. 5 ( PG) .

Other material. 172 specimens. Loc. 1, in moss on log, 1 ad. 9 (female), 1 juv. 6, 1 juv. 5, 21.iv.1989 ( HM); ibid., Fungi sample , 2 ad. 9 (female), 1 subad. 8 (female), 21.iv.1989 ( JD). Loc. 2, in moss on dead log , 1 ad. 9 (male), 1 juv. 6, 1 juv. 3, 21.iv.1989 ( JD); in moss on ground , 2 subad. 8 (female), 1 juv. 6, 21.iv.1989 ( HM); in moss on rocks , 2 ad. 9 (female), 1 subad. 8 (male), 1 juv. 5, 21.iv.1989 ( PG). Loc. 4, in moss on logs , 8 ad. 9 (4 male, 4 female), 6 subad. 8 (3 male, 2 female, 1 sex?), 3 juv. 6, 7 juv. 5, 9.xi.1989 ( PG), in moss , 7 ad. 9 (2 male, 5 female), 5 subad. 8 (1 male, 4 female), 3 juv. 6, 1 juv. 5, 18. xi.1989 ( HM). Loc. 5, in moss on log , 1 juv. 5, 29.xi.1989 ( RC); PKD , 1 juv. 3, 25.xi.1989 ( RC); in soil core , 1 juv. 6, 29.xi.1989 ( HM). Loc. 6, pitfall trap , 1 juv. 3, 24–29.xi.1989 ( RC). Loc. 7, in leaf litter , 1 juv. 6, 12.v.1989 ( PG); Fungi sample , 1 ad. 9 (male), 12.v.1989 ( DR). Loc. 8, hand collection , 1 ad. 9 (female), 22.v.1989 ( HM). Loc. 9, in leaf litter , 4 ad. 9 (2 male, 2 female), 3 subad. 8 (2 male, 1 female), 1 juv. 6, 2 juv. 3, 18.xi.1988 ( PG); in soil cores , 2 ad. (male, female), 1 subad. 8 (female), 20.x.1989 ( RC). Loc. 10, in moss on log , 7 ad. 9 (2 male, 5 female), 3 subad. 8 (1 male, 2 female), 3 juv. 6, 1 juv. 5, 25.viii.1989 ( HM); in lichen on trees , 2 ad. 9 (male, female), 1 subad. 8 (male), 1 juv. 6, 3 juv. 5, 25.viii.1989 ( HM); in moss on ground , 1 ad. 9 (female), 25.viii.1989 ( RC). Loc. 12, in moss on dead log , 11 ad. 9 (7 male, 3 female, 1 sex?), 5 subad. 8 (3 male, 1 female, 1 sex?), 6 juv. 6, 5 juv. 5, 2 juv. 3, 4-9.iv.1989 ( JD, PG); in moss on tree , 2 ad. 9 (female), 4. iv.1989 ( JD, PG, HM); in leaf litter , 4 ad. 9 (1 male, 3 female), 3 subad. 8 (male), 4 juv. 6, 2 juv. 5, 4.iv.1989 ( PG), and 6 ad. 9 (2 male, 4 female), 1 subad. 8 (female), 2 juv. 5, 2 stad.?, 9.iv.1989 ( PG); in moss , 15 ad. 9 (5 male, 10 female), 1 juv. 5, 3 juv. 3, 9.iv.1989 ( JD) .

Diagnosis. Stylopauropoides scissus appears related to S. duplex (Remy) from New Zealand ( Remy 1956a). It is distinguished from that species by the long-stalked antennal globulus g (short-stalked in duplex ), the shape of the T 3 (in two parts, proximal 2/3 thickened and with dense oblique pubescence, distal 1/3 very thin with branched hairs arranged in whorls in scissus ; axes thin, pubescence hairs short and thin in duplex ) and the shape of the anal plate (branches subcylindrical with subapical constriction in scissus , thickest in distal half, rounded and without constriction in duplex ; and the distal appendages of the anal plate (with subcentral stalk in scissus , anteroproximal in duplex ).

Description. Length.-(0.76-)0.82(-1.03) mm.

Head.-The a 2 and a 3 of 4th row fairly long, other tergal setae of medium length, submedian and anterior setae clavate, a 3 of 2nd row and posterolateral setae subcylindrical. Relative lengths of setae, 1st row: a 1 =10, a 2 =(10-)11(-12); 2nd row: a 1 =9(-11), a 2 =a 3 =(14-)16(-17); 3rd row: a 1 =12(-14), a 2 =?(13-16); 4th row: a 1 =(13-)14(-17), a 2 =(24-)25(-31), a 3 =(18-)25(-28), a 4 =?(15-18); lateral group setae: l 1 =(26-)27(-30), l 2 =(24-)25(-31), l 3 =(28-)34. The ratio a 1 /a 1 -a 1 in 1st row 0.8(-0.9), 2nd row 0.5(-0.7), 3rd row 0.8(-1.0) and 4th row 1.0(-1.3). Temporal organs in tergal view narrowly ovoid, their length 0.7(-0.8) of their shortest distance apart, posterolateral part with exterior, clavate, somewhat curved vesicle, length = 0.1 of the length of temporal organ. Head and temporal organs almost glabrous.

Antennae.-Segment 4 with six subcylindrical annulate-striate setae; their relative lengths: p =100, p' =67(-84), p'' =(42-)43(-48), p''' =(20-)25(-27), r =20(-22), u =(6-)7. Tergal seta p (0.8-)0.9(-1.1) times as long as tergal branch t. The latter fusiform, (3.1-)3.4(-3.7) times as long as its greatest diameter and (0.9-)1.1 times as long as sternal branch s, that branch (2.1-)2.3(-2.5) times as long as its greatest diameter; posterodistal and anterodistal corners equally truncate. Seta q subcylindrical, annulate-striate, tapering distally, (0.7-)0.8 of the length of s. Relative lengths of flagella (basal segments included) and basal segments: F 1 =100, bs 1 =(9-)11(-12); F 2 =(71-)87, bs 2 =(7-)9(-11); F 3 =(76-)84(-85), bs 3 =(10-)12. The F 1 (2.3-)2.4(-2.7) times as long as t, F 2 and F 3 (2.0-)2.2(-3.0) and (2.0-)2.2(-2.9) times as long as s respectively. Distal calyces subhemispherical; distal part of flagella axes widened only between calyx and the distal lamella. Globulus g (1.7-)1.9 times as long as wide; 9 (-10) bracts, capsule spherical; width of g 0.6 of the greatest diameter of t. Rudimentary globulus on posterotergal side of 3rd segment. Antennae glabrous.

Trunk.-Setae of collum segment furcate; primary branch folioform with short almost erect pubescence, secondary branch rudimentary, cylindrical, glabrous. Sublateral setae 1.1(-1.3) times as long as submedian ones; sternite process rounded but with a small anteromedian incision; appendages low and wide with flat divided caps with collar; process and appendages with delicate pubescence.

Setae on most anterior and posterior tergites cylindrical, medial ones clavate; 4+4 setae on tergite I, 6+6 on II-V, 4+2 on VI. Submedian posterior setae on VI 0.4 of their distance apart and (1.3-)1.4(-1.7) times as long as pygidial setae a 1.

Relative lengths of bothriotricha: T 1 =100, T 2 =(98-)110(-112), T 3 =?(114-136), T 4 =(140-)144(-155), T 5 =(160-)168(-210), axes thin, simple, straight except T 3 being moderately thickened in proximal 2/3. Pubescence hairs on T 5 and on thickened part of T 3 very short, on proximal halves of T 1, T 2 and T 4 thicker, oblique, increasing in length outwards and on distal 1/3 of T

1

-T

4

long, erect, ramose, whorled.

Genital papillae short, subcylindrical, rounded distally, 1.2(-1.3) times as long as wide, glabrous; seta very thin and short, 0.4 of the length of the organ.

Legs.-Setae on coxa and trochanter of leg 9 furcate, densely pubescent, main branch leaf-shaped, broadest in the middle, secondary branch clavate, protruding from the middle of the primary one and reaching 0.6(-0.7) of the length of primary branch; these setae more anteriorly with proportionately broader main branch and the secondary branch rudimentary and glabrous. Tarsus of leg 9 (3.7-)4.2(-4.4) times as long as its greatest diameter. Proximal seta tapering, pointed, with very short oblique pubescence; distal seta subcylindrical annnulate blunt. Proximal seta 0.4(-0.5) of the length of tarsus and (2.1-)2.3(-2.5) times as long as distal seta. Cuticle of tarsus with minute pubescence.

Pygidium. Tergum.-Posterior margin between st straight. Relative lengths of setae: a 1 =100, a 2 =(171-)200(-231), a 3 =(247-)250(-308), st =(48-)50(-64). All but st curved inwards, tapering, pointed, very shortly pubescent; a 1 and a 2 pointing inwards; st cylindrical, blunt with short pubescence. Distance a 1 -a 1 3.2(-3.7) times as long as a 1; distance a 1 -a 2 1.1(-1.4) times as long as distance a 2 -a 3; distance st-st (2.7-)3.8(-3.9) times as long as st and 0.5 of distance a

1

-a

1

.

Sternum.-Posterior margin between b 1 with deep indentation and large posteromedian rounded lobe. Relative lengths of setae (a 1 =100): b 1 =(277-)317(-320); setae thin, somewhat tapering, shortly pubescent in proximal half, striate distally, (as long as-)1.1 times as long as their distance apart. Anal plate directed somewhat upwards, somewhat broader than long and divided longitudinally into two branches separated by a V-shaped posteromedian incision; branches with subapical constriction; each branch with a distal stalked subhemispherical appendage; plate and appendages with very distinct almost erect pubescence.

Etymology.-From Latin scissus = forked, cloven (anal plate).

Distribution in Tasmania. This species is the most widely distributed of all the Tasmanian species. It was collected at 11 of the 12 main collecting sites.

Figures

Figs. 142–154. Stylopauropoides scissus sp.nov., holotype: 142, head, median and right part, tergal view; 143, temporal organ, posterior part with pistil, lateral view; 144, temporal organ, posterior part with pistil, tergal view; 145, right antenna, tergal view; 146, collum segment, submedian and left part, sternal view; 147, tergite VI, posterior part; 148, T; 149, T; 150, genital papillae and seta on coxa of 2nd pair of legs, anterior view; 1 3 151, seta on coxa of 9th pair of legs; 152, tarsus of 9th pair of legs; 153, pygidium, posterior part, sternal view; 154, anal plate, lateral view. Scale line a for figure 149; b for figures 145–148, 150–152; c for figures 142–144, 153, 154.