Anoplodesmus solenophorus, Nguyen, Anh D., 2010

Nguyen, Anh D., 2010, The millipede genus Anoplodesmus Pocock, 1895 in Vietnam (Diplopoda: Polydesmida: Paradoxosomatidae), Zootaxa 2649, pp. 52-60 : 56-59

Anoplodesmus solenophorus sp. nov.

Figs. 12–22 .

Material examined: HOLOTYPE ɗ, Vietnam, Binh Phuoc Province, Bu Gia Map National Park, tropical forest, 12 0 12’012”N, 107 0 12’245”E, 450 m a.s.l., pitfall traps, 20 April 2009, leg. Nguyen Duc Anh.

PARATYPES: 1 Ψ, same data, together with holotype; 3 ɗɗ, 2 ΨΨ, same locality and place, 10–24 April 2009, leg. Nguyen Duc Anh; 4 ɗɗ, 1 Ψ, 1 juvenile, same locality, bamboo forest, 12 0 10’928”N, 107 0 11’857”E, 700 m a.s.l., pitfall traps, 23 April 2009, leg. Nguyen Duc Anh; 2 ɗɗ, 1 Ψ, Da Nang, Ba Na National Park, forest, 1200 m a.s.l., July 2009, leg. Truong Xuan Lam.

Etymology: “ solenophorus ”, an adjective, refers to the gonopod solenophore (= postfemoral region) supplied with several spiniform processes.

Diagnosis: This new species seems to be especially similar to both A. borealis sp.n. and A. anichkini Golovatch & Semenyuk, 2010 in body shape and the presence of strong sternal cones, but differs in gonopod structure, in particular the solenophore which is supplied with numerous spiniform processes, and a slender femorite.

Description: Size: body length 26.0– 26.4 mm (ɗ), 25.9–26.8 mm (Ψ), width of midbody pro- and metazona 1.9 mm (ɗ), 2.4 mm (Ψ) and 2.1 mm (ɗ), 2.5 mm (Ψ), respectively. Holotype about 27 mm long, width of midbody pro- and metazona 1.7 and 1.9 mm, respectively.

Coloration: body generally dark brownish or castaneous brown, except for lighter small middle parts and pro- and metazona. Sterna yellow while most of podomeres and antennomeres darker. Telson and distal antenomeres lighter.

Head: labrum and lower part of frons densely setose, upper part and vertex sparsely setose along a distinct epicranial suture. In width, head slightly narrower than collum. Antennae long, claviform, almost reaching behind end of segment 4 laterally.

Collum: a little wider than segment 2> 3> 4, but equal to segment 5. Following metaterga with two rows of setae: 4+4 close to anterior margin, and 2+2 behind.

Body: submoniliform, parallel-sided on segments 5–16, thereafter gradually tapering towards telson. Prozona shagreened and shining; metaterga shining, smooth, not rugulose, with a row of 2+2 setae. Axial line thin and vague. Stricture between pro- and metazona relatively wide (sometimes almost half of prozonital length), smooth, neither beaded nor striolate. Transverse sulcus poorly-developed, superficial, starting from metaterga 8. Paraterga almost missing, expressed as a small rounded area surrounding ozopore. Pleurosternal carinae well-developed, present until segment 15, onward wanting.

Telson: Epiproct rather long, similar to that in A. borealis sp. n. Paraproct semi-circular, with two setae on disk. Hypoproct subtriangular, with two setae near caudal end ( Fig. 12 ).

Sterna: sparsely setose, cross-impression with both transverse and longitudinal sulci moderately developed. Anterior cones stouter and shorter, posterior ones longer ( Fig. 14 ). An elevated bifid lamina between ɗ coxae 4 ( Fig. 15 ).

Legs: long and slender, about 1.6–1.8 times (ɗ), 1.4 times (Ψ) as long as midbody height. Tarsal brushes present until leg pair 15, onward missing. Prefemora obviously inflated or swollen dorsally ( Fig. 13 ).

Gonopod ( Figs 16–22 ) relatively complex. Coxite slender and about half as long as femorite, distoventral part sparsely setose. Prefemorite as usual densely setose. Femorite twice as long as coxite, with two obvious crests mesally and laterally. Distofemoral process (dp) spiniform, rather long and retrorse. Solenophore (= postfemoral region) with three processes at tip, a small, knife-shaped (kp) process located between two long spiniform ones. Lamina medialis well-developed, with shorter and longer spines. Lamina lateralis also with two spiniform lobes. Seminal groove running distoventrad only mesally before entering an extremely long, flagilliform solenomere, of which only proximal quarter sheathed by solenophore.

Figures

FIGURES 12 – 18. Anoplodesmus solenophorus sp. nov., holotype: 12: hypoproct; 13: leg 10, lateral view; 14: sternite 5, ventral view; 15: sternite 10, ventral view; 16 – 18: right gonopod, mesal (16), lateral (17) and dorsal views (18). Scale bars = 1.0 mm.

FIGURES 19 – 22. Anoplodesmus solenophorus sp. nov., paratype from Ba Na National Park: right gonopod, mesal (19 – 21) and lateral views (22). Blank scale bars = 1.0 mm.