Sundanina cochinchina, Nguyen, Anh D., 2010

Nguyen, Anh D., 2010, The millipede tribe Sundaninini in Vietnam (Diplopoda: Polydesmida: Paradoxosomatidae), Zootaxa 2479, pp. 59-68 : 65-67

Sundanina cochinchina sp.nov.

Figs. 20 –25.

Material studied: HOLOTYPE ♂: ( IEBR) Vietnam, Tay Ninh Prov., Tan Bien District, LoGo–XaMat National Park (11 0 02’–11 0 47’N, 105 0 57’–106 0 04’E), deciduous forest, 11/2003, leg. Nguyen Duc Anh. PARATYPES: 3 ♂♂, 4 ΨΨ ( IEBR) and 1 ♂, 1 Ψ ( ZMUM): same data, together with holotype.

Etymology: “ cochinchina ”, a noun in apposition, to emphasize the territory of southern Vietnam, whence the new species comes.

Diagnosis: The new species can be distinguished from the congeners by the large and stout gonocoxae, in the gonofemorite being supplied with a subrectangular laminiform and a triangular process, as well as in the subequally short solenomere and solenophore, the latter leaving the former free, totally unsheathed.

Description: A large paradoxosomatid, ca 37.8 (♂) and 31.2 mm (Ψ) long, width of midbody pro– and metazona 3.2 and 4.0 mm (♂) or 3.5–3.8 and 4.4–4.8 mm (Ψ), respectively. Holotype 37.8 mm long, 3.2 and 4.0 mm wide on pro– and metazona, respectively.

Coloration generally castaneous brown, except for rear metatergal margin, paratergal calluses, base and distal parts of podomeres, as well as sterna yellowish.

Head sparsely setose along epicranial suture, latter very distinct and deep. Antennae very long and slender, not claviform.

Body: width of head <segment 3 <4 <collum <2 = 5–17, thereafter tapering toward telson. Metatergal surface smooth and shining, with traces of neither setae nor small knobs. Transverse metatergal sulcus vague on segments 2–4, but obvious and deep on subsequent segments, reaching the base of paraterga, slightly arcuate anteriad near middle. Axial line very evident on all metaterga ( Fig. 20 ). Prozona and pleura smooth. Stricture between pro– and metazona evident and deep, longitudinally striolate dorsally. Pleurosternal carinae well–developed, present until segment 17, wanting on subsequent segments. Paraterga very well developed, set low (at about 1/3 of metazonital height). Front corner of paraterga rounded while caudal one acute and strongly surpassing rear tergal contour, even reaching next metazonite (especially so on posteriormost segments). Paratergal calluses distinct and large, taking up ca 1/3–1/2 width of paraterga. Ozopores visible in dorsal view, lying inside a small hollow on lateral side of paraterga.

Epiproct small, concave, tip with 3–4 long setae and two long tubercles ( Fig. 22 ). Hypoproct subtraperziform.

Sterna modestly setose, cross–impressions moderate, without any modifications except for a bifid lamina between male coxae 4 ( Fig. 21 ). Legs relatively long and slender, ca 1.5–1.6 times (in male) or 1.4 times (in female) as long as midbody height, with a macroseta each in distoventral parts of coxa and prefemur. Ventral brushes missing on all tibiae and tarsi

Gonopods ( Figs 23–26 ) relatively simple. Coxa stout and large, subcylindrical, more or less clearly constricted distally, modestly setose distoventrally. Prefemur short, about half as short as coxite, as usual densely setose, with a long macroseta distoventrally. Femorite slender and 1.2 times longer than coxite, suberect and slightly twisted distoventrad, where supplied with a well–developed, subrectangular, laminiform process (lp). Solenophore (sph) distinctly demarcated from femorite by a transverse sulcus laterally and with a parabasal outgrowth (po). Tip of solenophore poorly bifid. Seminal groove running mostly on mesal side of gonopod, shifted distoventrad before entering a rather short, free, flagelliform solenomere (sl) laterally. The latter shorter than solenophore, not sheathed by solenophore

Remarks: The new species belongs to the group of Sundanina species showing two additional gonofemoral processes, e.g. Sundanina modiglianii (Silvestri, 1895) , S. bataviae (Humbert & De Saussure, 1869) , S. niasensis (Silvestri, 1895) , S. trifasciata (Silvestri, 1895) etc. ( Jeekel 1979). It differs from congeners in the characteristics presented in the above diagnosis.

Figures

FIGURES 20 – 24. Sundanina cochinchina sp. nov., ♂ holotype: segment 10, dorsal view (20); sternum 4, posterioventral view (21); telson, dorsal view (22); left gonopod, mesal view (23), lateral view (24); postfemoral region, mesal view (26). Scale bar = 1 mm