Anoplodesmus borealis, Nguyen, Anh D., 2010

Nguyen, Anh D., 2010, The millipede genus Anoplodesmus Pocock, 1895 in Vietnam (Diplopoda: Polydesmida: Paradoxosomatidae), Zootaxa 2649, pp. 52-60 : 54-56

Anoplodesmus borealis sp. nov.

Figs. 1–11 .

Material examined: HOLOTYPE ɗ ( IEBR), Vietnam, Bac Giang Province, Son Dong District, Tay Yen Tu Nature Reserve, Khe Ro commune, secondary forest, litter, 18 April 2007, leg. Nguyen Duc Anh.

PARATYPES: 2 ΨΨ ( IEBR), same data, together with holotype; 1ɗ, 1Ψ ( IEBR), 1ɗ, 1Ψ ( ZMUM), Tuyen Quang Province, Na Hang District, 15 km on way to Tuyen Quang, bamboo forest, 10 July 2008, leg. Nguyen Duc Anh

Etymology: “ borealis ”, an adjective, refers to northern Vietnam, where the species was found.

Diagnosis: This new species seems to be especially similar to A. anichkini Golovatch & Semenyuk, 2010 , but distinguished by the gonopod being devoid of a distofemoral process, coupled with the solenophore of a particular shape, much shorter than the solenomere.

Description: Size: body length 22.4–28.8 mm (ɗ), 32.1–33.9 mm (Ψ). Width of midbody pro- and metazona 1.8–2.3 mm (ɗ), 2.7–3.3 mm (Ψ), and 2.1–3.0 mm (ɗ), 3.3–3.8 mm (Ψ), respectively. Length of holotype 27.3 mm, width of pro- and metazona 2.3 and 3.0 mm, respectively.

Coloration: generally dark brown, except for yellowish brown middle parts of metaterga, as well as pleura and sterna. Legs pale yellow, antennae light brown.

Head: labrum and frons densely setose, vertex sparsely setose along epicranial suture. Latter deep, distinct, running from rear margin of frons down to labrum. Antennae slender and very long, reaching behind segment 4 laterally.

Collum: a little narrower than head, surface smooth, with two rows of setae: 5+5 close to front margin, and 1+1 behind (ɗ), or 4+4 and 2+2 (Ψ), respectively.

Body: width of segment 3 <4 <2=5, parallel-sided on segments 5–16, thereafter gradually tapering towards telson. Metatergal surface smooth, shagreened, shining, with only one row of 2+2 setae near anterior margin. Tranverse sulcus very poorly-developed, superficial, visible only on metaterga 5–18. Prozona and pleura also shagreened and shining. Stricture dividing pro- and metazona rather wide, deep and smooth, neither striolate nor beaded ( Figs 1–2 ).

Paraterga strongly reduced, almost missing, slightly more easily traceable as lateral bulges on porebearing segments than on poreless ones. Ozopore formula normal, pores located on paraterga 5, 7, 9, 10, 12, 13 and 15–19. Pleurosternal carinae well-developed until segment 16, missing on subsequent ones ( Fig. 2 ).

Telson: Epiproct long and curved down, with four small spinnerets at tip. Paraprocts semi-circular, each with two setae located on disk. Hypoproct subtrapeziform, with two distolateral setiferous knobs ( Fig. 3 ).

Sterna: sparsely setose, cross-impression with both transverse and longitudinal sulci moderately developed. Sternal cones obvious, front pairs slightly stouter and stronger, caudal pairs somewhat slenderer and longer ( Fig. 4 ). ɗ sternite 5 with an elevated bifid lamina between coxae 4, and a caudal pair of sternal cones elevated ventrad between coxae 5 ( Fig. 5 ).

Legs: slender and about 1.7 times (ɗ) as long as body height. Tarsal brushes present until segment 17, thereafter missing. Femora without modifications.

Gonopod ( Figs 6–11 ) rather complex. Coxite stout, about half length of telopodite, distoventral part sparsely setose. Prefemoral part as usual densely setose. Femorite (fe) stout, with two membranes (mem), one lateral, the other mesal, and separated from postfemoral region laterally by a distinct demarcation sulcus. Solenophore (sph = postfemoral region) relatively complex, with two distal processes (dp1 and dp2). Lamina medialis well-developed and folded, lamina lateralis with a long process (lp). Seminal groove running distodorsad fully on mesal side of femorite, Solenomere (sl) flagelliform, relatively long, only its proximal half sheathed by solenophore.

Figures

FIGURES 1 – 7. Anoplodesmus borealis sp. nov., holotype: 1: segments 10 and 11, dorsal view; 2: segment 10, lateral view; 3: hypoproct, ventral view; 4: sternite 10, ventral view; 5: sternite 5, ventral view; 6 – 7: right gonopod, mesal (6) and lateral views (7). Scale bars = 1.0 mm.

FIGURES 8 – 11. Anoplodesmus borealis sp. nov., holotype: right gonopod, mesal (8, 10, 11) and lateral views (9). Blank scale bars = 1.0 mm.