| _version_ | 1866901941387264000 |
|---|---|
| author | Kamimura, Yoshitaka Cheah, Shen Wang, Wendy Yanling Lam, Weng Ngai |
| author_facet | Kamimura, Yoshitaka Cheah, Shen Wang, Wendy Yanling Lam, Weng Ngai |
| contents | <p><i>Gonolabis sumatrana</i> de Bormans, 1900</p><p>Figs 26–33</p><p><i>Gonolabis sumatrana</i> de Bormans, 1900: 452 (Sumatra).</p><p><i>Gonolabis emarginata</i> Srivastava, 1990: 27, figs 12–17 (Bukit Timah, Singapore). syn. nov.</p><p><b>Literature.</b></p><p>Burr (1902: 480) “ <i>G. sumatrana</i> Borm. (fig. 2. ♂). – Singapore (Biró). ”</p><p><b>Specimens examined.</b></p><p><b>ZRC</b> • 2 ♂♂, 2 ♀♀, 1 nymph; Bukit Timah Hindhede Drive; Dec. 1989; H. K. Lua leg.; ZRC_DER_0000003. • 1 ♀; Lower Peirce Reservoir; 21 Jul. 1990; C. M. Yang leg.; ZRC_DER_0000006. • 1 ♂, 1 ♀; Pulau Tekong; 27 Nov. 2001; C. M. Yang, C. M. <i>S. leg</i>.; Under honey comb, Drain; ZRC_DER_0000024. • 1 ♂; Botanic Gardens; Jun. 1965; P. H. <i>L. leg</i>.; ZRC_DER_0000129. <b>NTU</b> • 1 ♀; Central catchment nature reserve; 10 Apr. 2023; W. N. Lam, G. K. Png, J. L. Loo leg.; Winkler extraction of leaf litter; MAC 2 F_23_1. • 1 ♂; same data as for MAC 2 F_23_1; MAC 2 F_23_2. • 1 ♀; same data as for MAC 2 F_23_1; MAC 3 U_23_1. • 1 ♂; same collection data as for MAC 2 F_23_1; 14 Apr. 2023; MAC 6 (re) F_23_1. • 1 ♀; Central catchment nature reserve; 21 Oct. 2021; W. N. Lam, G. K. Png, S. K. B. Tan leg.; Winkler extraction of leaf litter; MAC 6 F_21_1. • 1 ♂; same collection data as for MAC 6 F_21_1; 4 Oct. 2021; PEI 1 F_21_1. • 1 ♂; same collection data as for MAC 2 F_23_1; 23 May 2023; PEI 6 F_23_1. • 1 ♀; Pulau Ubin; 10 May 2023; W. N. Lam, G. K. Png, J. L. Loo leg.; Winkler extraction of leaf litter; UBI 10 U_23_1. • 1 ♂; same collection data as for UBI 10 U_23_1; 8 May 2023; UBI 1 F_23_1. • 1 ♀; same collection data as for UBI 10 U_23_1; 12 May 2023; UBI 3 U_23_2. • 1 ♂; Pulau Ubin; 17 Nov. 2021; W. N. Lam, G. K. Png, S. K. B. Tan leg.; Winkler extraction of leaf litter; UBI 7 F_21_1. • 1 ♀; same collection data as for UBI 10 U_23_1; 3 May 2023; UBI 9 U_23_1.</p><p><b>Distribution.</b></p><p>Peninsular Malaysia, Borneo, Sumatra, Java, Sulawesi, Singapore.</p><p><b>Remarks.</b></p><p>Srivastava (1990) described <i>Gonolabis emarginata</i> based on a single adult male specimen collected at Bukit Timah, Singapore (Figs 26–29). He noted that the species closely resembles <i>G. sumatrana</i>, but distinguished it by a larger body size, a slightly emarginate posterior margin of the penultimate sternite (vs broadly rounded in <i>G. sumatrana</i>), and parameres with a concave internal margin and rounded external angle (vs straight and obtuse). However, examination of multiple <i>G. sumatrana</i> specimens from Singapore revealed that the posterior margin of the penultimate sternite is nearly truncate at the middle in smaller males (Fig. 32) but tends to be concave in larger males, with the variation appearing continuous (Fig. 31). Additionally, the paramere morphology of the <i>G. emarginata</i> holotype (CASTYPE 16526 [CAS]) falls within the observed range of individual variation in <i>G. sumatrana</i> (Figs 27, 33; see also Sakai 1987). Both taxa consistently exhibit a comma-shaped sclerite within each penis lobe along with a virga (Figs 28, 34; Zacher 1911). Although Srivastava (1990) noted similarities between <i>G. emarginata</i> and <i>G. oblita</i> Burr, 1910 a, such accessory structures have not been reported for <i>G. oblita</i> (Burr 1915; Brindle 1980).</p><p>Preliminary DNA analysis further supports the synonymy, revealing minimal genetic variation among <i>G. sumatrana</i> specimens from Singapore, including individuals with <i>G. emarginata</i> - like traits. Based on these findings, we conclude that <i>G. emarginata</i> represents a large-bodied variant of <i>G. sumatrana</i>, and we propose its treatment as a junior synonym of the latter. It is also noteworthy that <i>G. sumatrana</i> exhibits a sharp posterior projection on the lateral sides of abdominal segments VI through IX, with the degree of projection varying individually and typically more pronounced in larger males (Figs 29, 30). According to Burr (1915), <i>G. oblita</i> lacks such structures.</p><p>Previous records of <i>G. sumatrana</i> from Borneo and Peninsular Malaysia (Borelli 1932 a, b) are based solely on female specimens, which are difficult to identify to species level and warrant further examination. However, a male specimen in the ZRC likely collected in Pahang, Peninsular Malaysia (ZRC _DER_0000008), may provide additional insights.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_19398588 |
| institution | Zenodo |
| language | |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Gonolabis sumatrana de Bormans 1900 Kamimura, Yoshitaka Cheah, Shen Wang, Wendy Yanling Lam, Weng Ngai Biodiversity Taxonomy Animalia Arthropoda Insecta Dermaptera Anisolabididae Gonolabis Gonolabis sumatrana <p><i>Gonolabis sumatrana</i> de Bormans, 1900</p><p>Figs 26–33</p><p><i>Gonolabis sumatrana</i> de Bormans, 1900: 452 (Sumatra).</p><p><i>Gonolabis emarginata</i> Srivastava, 1990: 27, figs 12–17 (Bukit Timah, Singapore). syn. nov.</p><p><b>Literature.</b></p><p>Burr (1902: 480) “ <i>G. sumatrana</i> Borm. (fig. 2. ♂). – Singapore (Biró). ”</p><p><b>Specimens examined.</b></p><p><b>ZRC</b> • 2 ♂♂, 2 ♀♀, 1 nymph; Bukit Timah Hindhede Drive; Dec. 1989; H. K. Lua leg.; ZRC_DER_0000003. • 1 ♀; Lower Peirce Reservoir; 21 Jul. 1990; C. M. Yang leg.; ZRC_DER_0000006. • 1 ♂, 1 ♀; Pulau Tekong; 27 Nov. 2001; C. M. Yang, C. M. <i>S. leg</i>.; Under honey comb, Drain; ZRC_DER_0000024. • 1 ♂; Botanic Gardens; Jun. 1965; P. H. <i>L. leg</i>.; ZRC_DER_0000129. <b>NTU</b> • 1 ♀; Central catchment nature reserve; 10 Apr. 2023; W. N. Lam, G. K. Png, J. L. Loo leg.; Winkler extraction of leaf litter; MAC 2 F_23_1. • 1 ♂; same data as for MAC 2 F_23_1; MAC 2 F_23_2. • 1 ♀; same data as for MAC 2 F_23_1; MAC 3 U_23_1. • 1 ♂; same collection data as for MAC 2 F_23_1; 14 Apr. 2023; MAC 6 (re) F_23_1. • 1 ♀; Central catchment nature reserve; 21 Oct. 2021; W. N. Lam, G. K. Png, S. K. B. Tan leg.; Winkler extraction of leaf litter; MAC 6 F_21_1. • 1 ♂; same collection data as for MAC 6 F_21_1; 4 Oct. 2021; PEI 1 F_21_1. • 1 ♂; same collection data as for MAC 2 F_23_1; 23 May 2023; PEI 6 F_23_1. • 1 ♀; Pulau Ubin; 10 May 2023; W. N. Lam, G. K. Png, J. L. Loo leg.; Winkler extraction of leaf litter; UBI 10 U_23_1. • 1 ♂; same collection data as for UBI 10 U_23_1; 8 May 2023; UBI 1 F_23_1. • 1 ♀; same collection data as for UBI 10 U_23_1; 12 May 2023; UBI 3 U_23_2. • 1 ♂; Pulau Ubin; 17 Nov. 2021; W. N. Lam, G. K. Png, S. K. B. Tan leg.; Winkler extraction of leaf litter; UBI 7 F_21_1. • 1 ♀; same collection data as for UBI 10 U_23_1; 3 May 2023; UBI 9 U_23_1.</p><p><b>Distribution.</b></p><p>Peninsular Malaysia, Borneo, Sumatra, Java, Sulawesi, Singapore.</p><p><b>Remarks.</b></p><p>Srivastava (1990) described <i>Gonolabis emarginata</i> based on a single adult male specimen collected at Bukit Timah, Singapore (Figs 26–29). He noted that the species closely resembles <i>G. sumatrana</i>, but distinguished it by a larger body size, a slightly emarginate posterior margin of the penultimate sternite (vs broadly rounded in <i>G. sumatrana</i>), and parameres with a concave internal margin and rounded external angle (vs straight and obtuse). However, examination of multiple <i>G. sumatrana</i> specimens from Singapore revealed that the posterior margin of the penultimate sternite is nearly truncate at the middle in smaller males (Fig. 32) but tends to be concave in larger males, with the variation appearing continuous (Fig. 31). Additionally, the paramere morphology of the <i>G. emarginata</i> holotype (CASTYPE 16526 [CAS]) falls within the observed range of individual variation in <i>G. sumatrana</i> (Figs 27, 33; see also Sakai 1987). Both taxa consistently exhibit a comma-shaped sclerite within each penis lobe along with a virga (Figs 28, 34; Zacher 1911). Although Srivastava (1990) noted similarities between <i>G. emarginata</i> and <i>G. oblita</i> Burr, 1910 a, such accessory structures have not been reported for <i>G. oblita</i> (Burr 1915; Brindle 1980).</p><p>Preliminary DNA analysis further supports the synonymy, revealing minimal genetic variation among <i>G. sumatrana</i> specimens from Singapore, including individuals with <i>G. emarginata</i> - like traits. Based on these findings, we conclude that <i>G. emarginata</i> represents a large-bodied variant of <i>G. sumatrana</i>, and we propose its treatment as a junior synonym of the latter. It is also noteworthy that <i>G. sumatrana</i> exhibits a sharp posterior projection on the lateral sides of abdominal segments VI through IX, with the degree of projection varying individually and typically more pronounced in larger males (Figs 29, 30). According to Burr (1915), <i>G. oblita</i> lacks such structures.</p><p>Previous records of <i>G. sumatrana</i> from Borneo and Peninsular Malaysia (Borelli 1932 a, b) are based solely on female specimens, which are difficult to identify to species level and warrant further examination. However, a male specimen in the ZRC likely collected in Pahang, Peninsular Malaysia (ZRC _DER_0000008), may provide additional insights.</p> |
| title | Gonolabis sumatrana de Bormans 1900 |
| topic | Biodiversity Taxonomy Animalia Arthropoda Insecta Dermaptera Anisolabididae Gonolabis Gonolabis sumatrana |
| url | https://doi.org/10.5281/zenodo.19398588 |