Stylopauropus laminatus, Scheller, Ulf, 2014

Scheller, Ulf, 2014, New records of Pauropoda (Myriapoda) with descriptions of new taxa, Zootaxa 3866 (3), pp. 301-332: 319

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Stylopauropus laminatus

n. sp.

Stylopauropus laminatus  n. sp.

Figs 30–37View FIGURES 30 – 37

Type specimen. Holotype: subad. 8 (♀), Thailand, Chiang Mai Prov., Doi Inthanon, 2100 m a. s. l., in litter, June 1, 1989, A. Bedos leg. Type specimen deposited in the Zoological Museum, University of Lund, Sweden.

Diagnosis. The small but distinct anal plate protruding backwards from between the setae st on the posterior part of the pygidial tergum has no equivalent in other species of the genus. Because the anal plate of the pygidial sternum has an extraordinary shape the relationships of this species cannot be traced at present.

Remarks. The occurrence of two anal plates, one on the sternum and the other on the tergum, has earlier been shown to occur in a few species in Tetramerocerata  , family Diplopauropodidae  with the genera Diplopauropus and Adelphopauropus ( Scheller 1988 b, 2013, Scheller & Muchmore 1990), in all three species. Stylopauropus laminatus  n. sp. may belong to a new genus, at present not possible to describe because the antennae are incomplete and all the bothriotricha are lacking in the material presented here.

Derivation of name. From the Latin laminus = thin plate, referring to the anal plate of the pygidial tergum.

Description. Length. 0.68 mm.

Head ( Fig. 30View FIGURES 30 – 37).Setae with oblique pubescence, partly dense, most tergal setae cylindrical, a 3 of 3 rd row and lateral group setae pointed. Relative lengths of setae, 1 st row: a 1 = 10; a 2 = 13; 2 nd row: a 1 = 13, a 2 = a 3 = 11; 3 rd row: a 1 = 13, a 2 =?; 4 th row: a 1 = 17, a 2 =?, a 3 = 15, a 4 =?; lateral group: l 1 = 11, l 2 = l 3 = 13. The ratio a 1 /a-a 1 in 1 st row 1.2, 2 nd row 0.6, 3 rd row 0.9, 4 th row 1.5. Temporal organs broadest anteriorly, in tergal view 0.7 of shortest interdistance. Head cuticle glabrous.

Antennae ( Fig. 31View FIGURES 30 – 37). Very incomplete, flagella and seta q lacking. Segment 4 with 4 setae, p and p ´ lacking, p '' and r both pointed, with oblique pubescence, length 15 µm. Tergal branch t cylindrical, 6.4 times as long as its greatest diameter and 1.1 times as long as the length of sternal branch s, that branch 3.4 times as long as its greatest diameter and with longish posterodistal truncation, Globulus g somewhat curved. 2.8 times as long as its greatest diameter; ≈ 11 bracts; capsule longer than wide. Diameter of g 1.2 times as long as the greatest diameter of t. Antennae glabrous.

Trunk ( Fig. 32View FIGURES 30 – 37). Setae of collum segment ( Fig. 32View FIGURES 30 – 37) with very short pubescence, submedian ones thick, clavate, sublateral ones furcate, main branch similar to submedian setae, secondary branch half of that length and inserted just outside the middle of the main branch. Sternite processes wide, subcylindrical, caps large thick. Process broad, two rounded anterior lobes separated by a V-shaped incision. Process and appendages glabrous.

Setae on anterior tergites as on median part on head, posteriorly growing longer. Tergite I with 4 + 4 setae, II –IV with 6 + 6, V with 6 + 4. Anterior row of setae on pygidial tergum with 4 setae, both d 1 and d 2. Tergites glabrous.

Bothriotricha. All lacking.

Legs ( Figs 33–35View FIGURES 30 – 37). Setae on coxa ( Fig. 33View FIGURES 30 – 37) and trochanter ( Fig. 34View FIGURES 30 – 37) of leg 9 furcate, branches thick cylindrical blunt, pubescence short, oblique; more anteriorly these setae leaf-shaped with rudimentary secondary branches. Tarsus of leg 9 ( Fig. 35View FIGURES 30 – 37) slender, tapering, 5.7 times as long as its greatest diameter. Proximal seta long, tapering, pointed, with distinct oblique pubescence, 0.4 of the length of tarsus and 3.9 times as long as cylindrical, distal seta. Cuticle of tarsus with distinct oblique pubescence on outer side, very short on inner side.

Pygidium ( Figs 36–37View FIGURES 30 – 37). Tergum: Posterior margin with distinct lobes around insertion points of setae st, in between straight. Setae of different shapes, a t thick, thickest in distal half, blunt, glabrous, a 2 and a 3 tapering, the former glabrous, the latter, pointed and with distinct oblique pubescence; their relative lengths: a 1 = 10, a 2 = 9, a 3 = 13, st = 9; a 1 and st almost straight, st also diverging, a 2 and a 3 curved inwards. Distance a 1 -a 1 0.6 of interdistance, distance a 1 -a 2 4.5 times as long as distance a 2 - a 3; distance st-st as long as st and 1.5 times as long as distance a 1 -a 1. Cuticle glabrous.

Sternum: Posterior setae b 1 cylindrical, blunt, with short, dense, oblique pubescence, posterior margin with broad shallow indentation. Relative lengths of setae (pygidial a 1 = 10): b 1 = 18 and 19; these setae as long as to 1.1 times long as interdistance.

Anal plate of tergum linguiform, glabrous, length 0.3 of the length of the anal plate of the sternum; the latter broadest anteriorly, sub-quadrate, posterior margin with deep U-shaped indention, depth ¼ of the length of the plate, four posteriorly directed appendages, two small dentiform ones protruding from sternal side of the middle of lateral margins, and two large, clavate ones protruding from posterior margin of posterolateral branches, these appendages, as long as plate, with distinct oblique pubescence.