Stemmops nigrabdomenus Zhu, 1998

Li, Fengyuan, Lin, Yejie, Gao, Fan, Yao, Yanbin & Li, Shuqiang, 2023, Taxonomic notes on Stemmops O. Pickard-Cambridge, 1894 (Araneae, Theridiidae) of China, Biodiversity Data Journal 11, pp. 106208-106208 : 106208

Stemmops nigrabdomenus Zhu, 1998

Materials

Type status: Holotype. Occurrence: recordedBy: Yongqiang Zhang; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: 7F54D174-ED02-5411-8E37-466B7FA9E31F; Taxon: scientificName: Stemmops nigrabdomenus; Location : country: China; stateProvince: Guangxi; locality: Nanning City ; Identification : identifiedBy: Mingsheng Zhu ; dateIdentified: 1998; Event : year: 1991; month: 3; day: 15; eventRemarks: not examined; Record Level : institutionCode: MHBU Type status: Paratype. Occurrence: recordedBy: Yongqiang Zhang; individualCount: 2; sex: males; lifeStage: adult; occurrenceID: D23C8482-1AA3-5959-849E-C57121EDA32C; Taxon: scientificName: Stemmops nigrabdomenus; Location : country: China; stateProvince: Guangxi; locality: Nanning City ; Identification : identifiedBy: Mingsheng Zhu ; dateIdentified: 1998; Event : year: 1991; month: 3; day: 15; eventRemarks: not examined; Record Level : institutionCode: MHBU Type status: Other material. Occurrence: recordedBy: Ming Yi; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: 3938AA8D-43CB-52F3-BC8C-47BCE166FB8A; Taxon: scientificName: Stemmops nigrabdomenus; Location : country: China; stateProvince: Guangxi; locality: Nanning City , Liangqing District , Nama Town ; Identification : identifiedBy: Yejie Lin ; dateIdentified: 2023; Event : year: 2019; month: 2; day: 15; Record Level : institutionCode: IZCAS Type status: Other material. Occurrence: catalogNumber: IZCAS-Ar44595 ; recordedBy: Chunxia Wang; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: 51F7929A-C918-58A6-8251-4F319ADC53AA; Taxon : scientificName: Stemmops nigrabdomenus; Location : country: China; stateProvince: Hainan; locality: Wenchang City , Tongguling Nature Reserve ; verbatimElevation: 189 m; decimalLatitude: 19.6721; decimalLongitude: 111.0155; Identification: identifiedBy: Yejie Lin; dateIdentified: 2023; Event: year: 2007; month: 8; day: 17; Record Level: institutionCode: IZCAS Type status: Other material. Occurrence: catalogNumber: IZCAS-Ar44596 ; recordedBy: Qianle Lu; individualCount: 1; sex: female; lifeStage: adult; occurrenceID: 5DF6DC9E-C373-55E0-A44D-7EA3CF2EA477; Taxon : scientificName: Stemmops nigrabdomenus; Location : country: China; stateProvince: Guangxi; locality: Yulin City , Beiliu City , Minle Town , Darong Mountain National Park ; decimalLatitude: 22.8615; decimalLongitude: 110.2744; Identification : identifiedBy: Yejie Lin ; dateIdentified: 2023; Event : year: 2022; month: 2; day: 15; Record Level : institutionCode: IZCAS

Description

Female (IZCAS-Ar44596). Total length 3.16; carapace 1.21 long, 1.04 wide, opisthosoma 2.08 long, 1.22 wide. Eye sizes and interdistances: AME 0.07, ALE 0.07, PME 0.07, PLE 0.07, AME-AME 0.06, AME-ALE 0.01, PME-PME 0.02, PME-PLE 0.01, AME-PME 0.06, ALE-PLE 0. Endites almost as long as wide. Leg measurements: I 5.13 (1.39, 1.78, 1.20, 0.76), II 3.67 (1.04, 1.14, 0.85, 0.64), III 3.47 (0.99, 1.09, 0.79, 0.60), IV 5.73 (1.59, 1.82, 1.46, 0.86).

Colouration (Fig. 1 c, Fig. 10 c Right). Carapace red-brown, covered with long sparse brown setae, black rings around PMEs. Chelicerae yellow. Endites and labium yellow. Sternum pale yellow. Legs red-brown, covered with sparse setae. Opisthosoma black, covered with sparse setae, with a white spot posteriorly. Spinnerets brown.

Epigyne (Fig. 9 A, B). Epigynal plate longer than wide, almost oval, with a pair of triangular hoods posteriorly. Septum emerges from a central position to the posterior. Copulatory openings located on posterior portion of epigyne. Copulatory ducts wide basally, curved and then coils around spermathecae for three turns. Spermathecae oval. Fertilisation ducts pincer-shaped.

Male. See Zhu (1998) (Figs 6 b, 7 c, 10 c Left).

Diagnosis

The male can be easily recognised by the embolic basal apophysis white and transparent, without obvious sclerotisation (Fig. 6 b) and the terminal of embolus not modified (Fig. 7 c). Females can be distinguished by the large, oblong epigynal plate, with a pair of hoods posteriorly (Fig. 9 A).

Distribution

China (Guangxi, Hainan) (Fig. 11 ).

Notes

The female is described here for the first time.

Figures

Figure 9. Stemmops nigrabdomenus, female. A Epigyne, ventral; B Vulva, dorsal. Abbreviations: CD copulatory duct; CO copulatory opening; FD fertilisation duct; H hood; Se septum; S spermatheca.

Figure 11. Distribution records of Stemmops species in China: 1 S. atratus sp. n.; 2 S. lini sp. n.; 3 S. nigrabdomenus. The green circles indicate type localities.