Chamberlinius sublaevus, Chen, Chao-Chun, Golovatch, Sergei I., Chang, Hsueh-Wen & Chen, Shyh-Hwang, 2011

Chen, Chao-Chun, Golovatch, Sergei I., Chang, Hsueh-Wen & Chen, Shyh-Hwang, 2011, Revision of the Taiwanese millipede genus Chamberlinius Wang, 1956, with descriptions of two new species and a reclassification of the tribe Chamberlinini (Diplopoda, Polydesmida, Paradoxosomatidae, Paradoxosomatinae), ZooKeys 98, pp. 1-27 : 12-13

Chamberlinius sublaevus sp. n. Figs 25 –3242– 44, 47, 4854-57

Holotype

♂ (NSYSUB-DI 50), Taiwan, Taichung County (台中縣), Heping Township (和平鄉), Syuan (思源), 1.5 km away from the entrance of forest path no. 710, ca. 2,050-2,100 m a.s.l., 21 August 2002, leg. C. C. Chen and Y. H. Lin.

Paratypes:

3 ♂, 1 ♀, 2 juveniles (NSYSUB-DI 51-57), same locality and date as in holotype.1 ♂, 1 ♀ (NCHUL), Nantou County (南投縣), Renai Township (仁愛鄉), Meifeng (梅峰), ca. 2,000 m a.s.l., 2 April 2002, S. H. Wu. 1 ♂ (TFRI), Ilan County (宜蘭縣), Datong Township (大同鄉), Lakes Jialuohu (加羅湖), ca. 2,300 m a.s.l., 22 April 2001, leg. W. C. Yeh. 1 ♂ (TFRI), same place, 26 April 2002, same collector. 1 ♂ (TFRI), same place, 4 June 2003, same collector. 1 ♂, 1 ♀ (NSYSUB-DI 451-452), same township, Yuanping forest path (元平林道), 4 km, on a dirty wall, ca. 1,990 m a.s.l., 29 August 2004, leg. H. D. Zhu.

Name:

To emphasize the elevated paraterga.

Diagnosis:

Closest to Chamberlinius piceofasciatus , but differs in the smaller size and higher paraterga; by the pleurosternal carinae with small caudal teeth either on segments 3-8(10) (♂) or 3-4, or without any caudal teeth (♀) (versus segments 3-5(10) (♂) or 3(4)-5(7) (♀) in Chamberlinius piceofasciatus ); and in gonopod structure, with the solenophore being slender, its tip pointed and placed ventrad under the solenomere (versus the solenophore being much stouter, blunt and remaining fully behind and above the solenomere in ventral view in Chamberlinius piceofasciatus ).

Description:

Length 29-30 (♂, n = 5) or 28 mm (♀, n = 1); width of metazonite 10 ca. 4-5 mm (♂) or 4-5.5 mm (♀). Coloration in alcohol (Fig. 25) pallid to light brown from head to end of epiproct, as well as from dorsum down to paraterga, sterna and legs; most of head (except for occipital part), anterior 2/3rds of collum (Fig. 27), and most of epiproct darker, colour pattern same as in Chamberlinius piceofasciatus (Gressitt, 1941) and similar in both sexes, but ♀ darker; antennae increasingly blackish distally, but tip contrastingly pallid.

In width, head <collum ≤ segment 2> 3 = 4 << 5 <6 <7 <8 ≤ 9 = 10 <11-15 in ♂, or head <collum <segment 2> 3 = 4 << 5-16 in ♀; thereafter body gradually and gently tapering both in width and height towards telson. Antennae (Figs 25, 26) long, slender, reaching either middle to end of metatergum 4 dorsally in ♂, or end of metatergum 3 in ♀. Surface generally shining and rather smooth, sometimes rugulose on metaterga, rugulose, finely and densely granular below paraterga 2-19 (Figs 26-28, 55). Paraterga (Fig. 27) very well-developed, calluses delimited by a sulcus only dorsally on segments 3-4, both dorsally and ventrally on segments 5-19; paraterga like high ridges (Fig. 28) extending beyond caudal tergal margin on segments 5-19 (Fig. 25), spiniform caudally (Fig. 30) on segments 17-19 in both sexes. Axial line (Fig. 27, arrow) wanting to sometimes traceable (on prozona), visible also at anterior edge of collum to end of segment 19, or on segments 5-19, better so on ♂ metaterga than in ♀. Transverse sulcus (Figs 27, 55) evident on segments 5-18, wanting on segment 19 in ♂, present on segments 5-18(19) in ♀, narrow, shallow, neither beaded at bottom nor reaching bases of paraterga. Limbus thin, caudal margin entire. Stricture (Figs 27, 55) between pro- and metazona faintly beaded at bottom dorsally. Pleurosternal carinae (Figs 26, 28, 55) well-developed on segments 2-10, traceable on segments 11-13 in ♂, reduced to low bosses on segments 14-17 in ♂, well-developed on segments 2-8, visible on 9-16 (17) in ♀, thereafter virtually absent in both sexes; with small caudal teeth either on segment s 3-8 or 3-10 (♂), or either on segments 3 and 4, or without any caudal teeth (♀). Tergal setae fully abraded, pattern untraceable. Ozopores (Figs 28, 55) lateral, lying on callus about one-third metatergal length in front of caudal edge. Epiproct (Fig. 29) digitiform, long, flattened dorsoventrally, ratio of epiproct length to pre-epiproct length of telson 1: 2.3 in ♂ (Fig. 30); subtruncate or emarginate in dorsal view; pre-apical papillae almost wanting, situated close to apex. Hypoproct (Fig. 31) subtrapeziform, caudally narrowly to broadly rounded, 1+1 setae at caudal corners situated on well-separated knobs, sides concave at base.

Sterna moderately setose, not modified; a pair of small, short, round, spiracle-bearing ridges flanking gonopod aperture (Fig. 32, arrows); each cross-impression with an evident transverse sulcus, without axial groove. ♂ legs (Figs 28, 55) evidently incrassate, especially so due to dorsally swollen prefemora, without tarsal brushes, ca. 1.7 times as long as midbody height, a little shorter and slenderer in ♀.

Gonopods (Figs 42-44, 47, 48, 54, 56, 57) very similar to those of Chamberlinius piceofasciatus , differing in solenophore (sph)being slender, elongate, pointed and directed ventrad under solenomere (sl).

Distribution:

This new species is also endemic to Taiwan, being high-montane (2,000-2,300 m a.s.l.) (Map).