Cebrenninus rugosus Simon, 1887

Dhiya'ulhaq, Naufal Urfi, Benjamin, Suresh P., Buchori, Damayanti, Hidayat, Purnama, Scheu, Stefan & Drescher, Jochen, 2025, Expanding the taxonomy of crab spiders (Araneae, Thomisidae) in Sumatra: a new genus, five new species, and regional records, ZooKeys 1241, pp. 205-246 : 205-246

Cebrenninus rugosus Simon, 1887

Figs 7 , 8

Cebrenninus rugosus Simon, 1887 468; Simon 1897: 9, figs 1, 2; Benjamin 2016: 190, figs 9, 11, 12, 17–20, 37, 57–64.

Cebrenninus annulatus Simon, 1897: 8.

Cebrenninus scabriculus Simon, 1897: 8.

Libania annulata Thorell, 1890: 149.

Libania armillata Thorell, 1890: 149.

Libania scabricula Thorell, 1890: 148.

Libania scabricula sulcata Thorell, 1890: 148.

Material examined.

Indonesia • Sumatra, Jambi Province, 1 ♀; Sarolangun, Air Hitam, Desa Baru ; 02°01'49.5"S, 102°46'14.8"E; elev. 57 m; 12 Jul. 2013; J. Drescher leg.; canopy fogging in jungle rubber plantation; GOET 2013_BJ 6.1_AraThom 048 N_001 (to be transferred to MZB) .

Diagnosis.

For diagnosis of Cebrennius rugosus Simon, 1887 see Benjamin (2016).

Description.

Female (2013_BJ 6.1_AraThom 048 N_001; Figs 7 , 8 ). Total length 4.35. Carapace length 2.08; width 2.05. Abdomen length 2.27; width 1.95. Diameter of eyes: AME 0.06; ALE 0.13; PLE 0.15; PME 0.07. Interdistances between eyes: AME – AME 0.14; AME – ALE 0.16; ALE – ALE 0.57; PME – PME 0.25; PME – PLE 0.29; ALE – PLE 0.23; AME – PME 0.24; PLE – PLE 0.85. Leg measurements: leg I 8.46 (2.67, 0.62, 2.63, 1.61, 0.93); leg II 8.68 (2.74, 0.68, 2.69, 1.61, 0.96); leg III 5.43 (1.63, 0.47, 1.52, 1.18, 0.63); leg IV 5.73 (1.77, 0.46, 1.54, 1.28, 0.68). For a complete description of C. rugosus see Benjamin (2016). The specimen described here possesses striated legs with granulation on the ventral side of femora (Fig. 7 A, D ). Epigynum (Fig. 8 ): CO positioned at the posterior end of spermatheca, connected to a semicircular window. Spermatheca oval with a small protrusion on the anterior end.

Distribution.

Malaysia (Borneo); Indonesia (Sumatra, Java, Borneo) Fig. 29 .

Remarks.

The specimen examined here is tentatively identified as Cebrenninus rugosus , as no images are available showing the dorsal view of the epigynum, and we are unable to re-examine any type specimen. Examined specimen also exhibits distinct banding and strong ventral granulation on the legs, which were not described in Benjamin (2016), although the lack of banding might be due to the fade of colouration in ethanol.

Figures

Figure 7. Cebrenninus rugosus Simon, 1887, female (2013 _ BJ 6.1 _ AraThom 048 N _ 001) A, B habitus A dorsal view B ventral view C eye region, frontal view D left femur I, prolateral view. Scale bars: 1 mm (A, B); 0.5 mm (C); 0.1 mm (D, E).

Figure 8. Cebrenninus rugosus Simon, 1887, female (2013 _ BJ 6.1 _ AraThom 048 N _ 001) A, B epigynum A ventral view B dorsal view. Abbreviations: CO = copulatory opening; FD = fertilisation ducts; S = spermatheca. Scale bar: 0.1 mm.

Figure 29. Distribution of examined Thomisidae species from the Epidius clade (sensu Benjamin, 2011) prior to the present study, as well as the sampling location of the current study in Jambi Province, Sumatra, Indonesia (green flag). The new genus and the five new species described in the present study are all from the same study location, i. e., a replicated plot design across lowland rainforest, ‘ jungle rubber’ (rubber agroforestry), and smallholder monoculture plantations of rubber and oil palm in Jambi’s lowlands (Drescher et al. 2016).