Geothelphusa takuan Shy, Ng & Yu, 1994

Shy, Jhy-Yun, Shih, Hsi-Te & Mao, Jean-Jay, 2021, Geothelphusa boreas, a new montane freshwater crab (Crustacea: Potamidae Geothelphusa) from northeastern Taiwan, and the identity of G. hirsuta Tan & Liu, 1998, Zootaxa 5060 (1), pp. 93-104 : 99-100

Geothelphusa takuan Shy, Ng & Yu, 1994

( Fig. 4 )

Geothelphusa takuan Shy, Ng & Yu, 1994: 823 , fig. 20a–f [type locality: Daguan, Fusing, Taoyuan]; Dai 1999: 387; Shy & Yu 1999: 75, 2 un-numbered figs.; Ng et al. 2001: 51; Chen et al. 2007a: 881, fig. 8A1–A3; Chen et al. 2007b: 906, fig. 4B; Shy & Lee 2009: 184, 8 un-numbered figs.; Shih et al. 2011: 461; Ng et al. 2017: 81; Shy et al. 2020: 154, figs. 119–121.

Geothelphusa hirsuta Tan & Liu, 1998: 288 , fig. 2A–E [type locality: Tai-an, Miaoli County, Taiwan]; Ng et al. 2001: 50; Shy & Lee 2009: 137, 7 un-numbered figs.; Shih et al. 2011: 461; Ng et al. 2017: 79; Shy et al. 2020: 82, figs. 66–68.

Material examined. Types: holotype male ( NTOU F10205), Daguan (= Takuan), Fusing (= Fuhsing), Taoyuan Co., Taiwan, coll. J.-Y. Shy & W.-L. Tsay, 1 Nov. 1992. Geothelphusa hirsuta Tan & Liu, 1998 : holotype male ( TMCD 3285 ), 1 paratype male ( TMCD 3292 ), Guanwu (= Kuanwu), Tai-an, Maioli (24°30’17.5”N 121°07’09.9”E), elevation of 2060 m, coll. H.-C. Liu, 13 Nov. 1993. Others: 3 ♂♂ (12.0– 16.2 mm), 3 ♀♀ (12.1–15.9 mm) (NCHUZOOL 13285), Daguanshan (= Lalashan ), Fusing , Taoyuan (24°42’28.9”N, 121°26’09.2”E), elevation of 1650 m, coll. H.- T. Shih, 4 Dec. 2000; 3 ♂♂ (12.4 × 10.4–17.4 × 13.0 mm), 1 ♀ (17.3 × 12.8 mm) (NCHUZOOL 16435), Daguanshan (= Lalashan), Fusing , Taoyuan (24°42’28.9”N, 121°26’09.2”E) , elevation of 1650 m, coll. Y.-H. Wang et al. 7 Sep. 2010; 4 ♂♂ (13.2 × 10.8 –16.1 × 12.1 mm), 1 ♀ (16.2 × 13.4 mm) (NCHUZOOL 17041), Smangus, Jianshih , Hsinchu County (24°34'41.6"N, 121°20'47.4"E) , elevation of 1560 m, coll. J.-J. Li, 3 Apr. 2021; 3 ♂♂ (14.8 × 11.6–18.4 × 13.7 mm), 5 ♀♀ (16.5 × 13.3–20.2 × 14.9 mm) (NCHUZOOL 13432), Syueba Farm, Wufeng , Hsinchu County , coll. 1 Dec. 2001; 1 ♂ (18.7 × 14.3 mm) (NCHUZOOL 13431), Sihmasian Forest Road, Tai-an , Miaoli .

Ecological notes: In Daguanshan, Geothelphusa takuan is sympatric with G. ilan . In Smangus, G. takuan is sympatric with G. ilan , G. cilan and G. sp.

Remarks: Based on the figure in Tan & Liu (1998: fig. 2), the G1 of G. hirsuta with the subterminal segment curves outwards, which is different from the inward curved subterminal segment of G. takuan ( Shy et al. 1994) . However, after reexamining on the holotype of G. hirsuta (TMCD 3285), we found both the right and left G1s (and G2s) were dissected and stored in small tubes separately. By comparing the right G1 detached from the adult male paratype (TMCD 3292), the labels of left and right on the tubes of holotype are confirmed to be actually reversed. That is, the figure and description for the G1 and G 2 in Tan & Liu (1998) are actually left ones instead. Our reexamination of the right G1s of the holotype ( Fig. 4C, D ) and paratype of G. hirsuta , found no difference from that of the holotype of G. takuan (NTOU F10205) ( Fig. 4A, B ). We also find that they differ only in the anterolateral margins, with G. hirsuta having lined with relatively clear granules ( Shy et al. 2020: fig. 66) and G. takuan having lined with lower granules ( Shy et al. 2020: fig. 119), too small a difference to warrant their recognition as separate taxa. With regard to the genetic similarity for the two species, see “DNA analyses and discussion”. Geographically, although the distance between the two type localities of G. takuan ( Fig. 1 : no. 5) and G. hirsuta ( Fig. 1 : no. 8) is about 40 km, they belongs to the same mountain range, the Hsuehshan Range ( Fig. 1 ), and a continuous distribution of a single species is expected.

Figures

FIGURE 1. Collection sites (empty circles) for the Geothelphusa species from northern Taiwan. For locality names, see Table 1. R. = river.

FIGURE 4. Male right G1s of Geothelphusa takuan Shy, Yu & Ng, 1994 (holotype, NTOU F10205; A, B) and G. hirsuta Tan & Liu, 1998 (holotype, TMCD 3285; C, D). A, C, ventral view; B, D, dorsal view. Scale = 1 mm.