Sellanucheza grandis ( Golovatch, 1984 )

Nguyen, Anh D., 2011, A review of the millipede tribe Tonkinosomatini (Diplopoda: Polydesmida: Paradoxosomatidae) from Vietnam, Zootaxa 3036, pp. 58-68 : 59-63

Sellanucheza grandis ( Golovatch, 1984)

( Figs. 1–2 . Map 1)

Material examined. 13, 1Ƥ: (IEBR-46), Vietnam, Ninh Binh Province, Cuc Phuong National Park, forest, September 2006, leg. Luu Van Hien; 13: (IEBR-59), Vietnam, Ha Tinh Province, Huong Son District, Son Kim commune, secondary forest, leaves litter, 600m a.s.l., 3 May 2004, leg. Nguyen Duc Anh; 13: (IEBR-60), Vietnam, Ha Tinh Province, Huong Son District, Cau Treo, secondary forest, leaves litter, 800m a.s.l., 30 April 2004, leg. Nguyen Duc Anh; 13, 1Ƥ: (IEBR-79), Vietnam, Phu Tho Province, Xuan Son National Park, Forest, 500m, 12–15 June 2004, leg. Nguyen Thi Phuong Lien; 23, 4ƤƤ (IEBR-177), Vietnam, Nghe An Province, Pu Mat National Park, Khe Thoi, closed forest, near stream, 18o58' 17.4N- 104o48' 20.9E, 4–10 April 2011, leg. Nguyen Duc Anh; 4 ƤƤ, 1 juvenile (IEBR-178), same data as sample IEBR-177.

Remarks. This species was described by Golovatch (1984) and so far is known only from Cuc Phuong National Park ( Golovatch, 1984; Korsós & Golovatch, 1989). The new records of S. grandis have expanded its distribution in northern Vietnam.

Sellanucheza hoffmani sp. nov. ( Figs. 3–5 . Map 1)

Material examined: HOLOTYPE: 13 (IEBR-61H), Vietnam, Kon Tum Province, Loxo Pass, approximately 80km north of Kontum, secondary forest, 800m a.s.l., 12–19 April 2004, leg. Nguyen Duc Anh.

PARATYPES: 43, 2ƤƤ, (IEBR-61P), same data as holotype.

NON-TYPES: 23, (IEBR-181), 5ƤƤ, 1 juvenile (IEBR-182), Vietnam, Quang Binh Province, Minh Hoa District, Thuong Hoa commune, Phong Nha-Ke Bang region, 10–22 August 2011, leg. Nguyen Duc Anh.

Etymology. This species is dedicated to Prof. Dr. Richard L. Hoffman, a prominent specialist in Diplopoda, who also established genus Szechuanella in 1961, a senior synonym of Sellanucheza Enghoff et al., 2004 . Diagnosis. The new species is close to its congener, S. grandis , in body form, but differs distinctly in gonopod characters, including a long, basal laminiform process of the postfemoral region, and a very long basal spine of the lamina medialis, and in having sternite V with two separated, small, setiferous cones between coxae 4.

Description. Size: body ca. 52mm (male), 59mm (female) in length, width of midbody pro- and metazona 4.5mm (male), 5.4 (female) and 5.3mm (male), 6.4mm (female), respectively. Holotype 52mm long and width of pro- and metazona 4.5mm and 5.4mm, respectively.

Coloration: castaneous brown in general, especially antenna, metaterga. Prozona, pleura and antennomeres 6 & 7 darker while other body parts including paraterga, sterna and legs yellowish ( Figs. 3 A–D).

Head: a bit smaller than collum, sparsely setose even on labrum. Frons slightly convex. Epicranial suture distinctly evident. Antenna slender, claviform, relatively long, ca. reaching to the end of body ring 4 laterally. Most antennomeres subequal in length, except for antennomeres 1 and 7 ( Figs. 3 A–B).

Collum: marginally broader than body rings 2–5, finely smooth without any granulation or rugosity, with traces of a row of 3+3 setae near front margin. Axial line obviously distinct. Paratergum modestly-developed, sub-semicircular.

Body rings: submoniliform, body rings 2–5 slightly smaller than 6, parallel-sided on body rings 6–15, thereafter tapering gradually onward. Both metaterga and prozona smooth, shining. Metaterga without any traces of setae. Metatergal transverse sulcus present from body ring 2, however, well-developed from body ring 5, extending to base of paraterga, which are keel-like but poorly developed on body rings 5–19 while modestly developed on body rings 2–4. Ozopore formula normal. Pores located at lateral sides of paraterga, but visible dorsally. Axial line thin, but obviously distinct, running from head to the end of body. Stricture dividing pro- and metazona thin and narrow, striate ( Figs. 3 C, 4A–B).

Sterna: sparsely setose, cross-impression moderate in terms of both longitudinal and transversal suture, without any modifications except two separated small setiferous cones between coxae 4. ( Figs. 3 D, 4C)

Legs: slender, not very long, subequal in length with body height. Tarsal brushes present until body ring 10, then thin and missing onward, however, only well-developed on mostanterior body rings ( Fig. 5 A). Legs without coxal swollen and adenostyle as well.

Telson: Epiproct short, with two small caudolateral tubercles. Tip with four spinneret cones ( Fig. 4 E). Paraproct subsemicircular with two setae on disk. Hypoproct subtriangular with two distolateral setae ( Fig. 4 D).

Gonopod: ( Figs. 4 F–H, 5B–D) Coxite (co) slender, short, about half of femorite in length, with densely setose part distoventrally. Telopodite subfalcate. Prefemur densely setose as usual, and separated from femorite by transversal sulcus laterally. Femorite (fe) long, marginally expanded distally with distal part slightly twisted ventrad, and ventrally curved simultaneously. No demarcation between femorite and postfemoral region (solenophore, sph). The latter modestly twisted ventromesad, with a long basal laminiform process (lp). Both lamina medialis (lm) and lamina lateralis (ll) well-developed. Solenophore with an additional long spine (sp) at base of lamina medialis. Seminal groove running entirely on mesal side, distodorsally, before entering flagiliform solenomere (sl) which is completely sheathed by solenophore.

Remarks. Hoffman (1961) established a new genus Szechuanella with the type species S. tenebra from Szechuan Province, China. Unfortunately, this name had been pre-occupied by Szechuanella Lu, 1959 with type species S. szechuanensis Lu 1959 for trilobites from China (Shelley et al., 2000). Consequently, Enghoff et al. (2004) substituted a nomen novum, Sellanucheza . However, Özdikmen (2007) later proposed a new replacement, Cemsunguria, without any comments on the previous substitution of Sellanucheza . Thus, under provision of Article 23 of the International Code of Zoological Nomenclature, the name Cemsunguria becomes a junior synonym of Sellanucheza .

This genus currently consists of 4 species including a new species here, and mostly distributed in southern China, and Vietnam so far (Map 1).

Figures

FIGURE 1. Sellanucheza grandis (Golovatch, 1984) from Ha Tinh province, whole body, lateral view (A), dorsal view (B). No scale.

FIGURE 2. Sellanucheza grandis (Golovatch, 1984) from Ha Tinh province, right gonopod, mesal view (A); distal part of gonopod, mesal view (B).

FIGURE 3. Sellanucheza hoffmani sp. nov., 1,3 – 4 Holotype body: anterior part, lateral view (A), midbody part, dorsal view (C), posterior part, ventral view (D); Paratype, female, whole body, lateral view (B). Scale bar = 10 mm.

FIGURE 4. Sellanucheza hoffmani sp. nov., holotype: body rings 10 – 11, dorsal view (A), lateral view (B); sternite V (C), hypoproct, ventral view (D); epiproct, ventral view (E); right gonopod, lateral view (F), mesal view (G); distal part of gonopod, dorsal view (H). Scale bar = 1 mm.

FIGURE 5. Sellanucheza hoffmani sp. nov., holotype, leg 9 (A); right gonopod, mesal view (B), postfemoral region, mesal view (C); tip of gonopod, mesal view (D).