Ctenus banna Yao & Li, 2022

Chu, Chang, Lu, Ying, Yao, Zhiyuan & Li, Shuqiang, 2022, A survey of ctenid spiders (Araneae, Ctenidae) from Xishuangbanna Tropical Botanical Garden, Yunnan, China, Biodiversity Data Journal 10, pp. 87597-87597 : 87597

Ctenus banna Yao & Li sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: Guo Zheng ; individualCount: 1; sex: male; lifeStage: adult; Taxon : order: Araneae ; family: Ctenidae ; genus: Ctenus ; Location : country: China; stateProvince: Yunnan; municipality: Xishuangbanna ; locality: Mengla County ; verbatimLocality: Menglun Town , Xishuangbanna Tropical Botanical Garden , Paramichelia baillonii plantation (about 20 yr.); verbatimElevation: 608 ± 11 m a.s.l.; verbatimLatitude: 21°54.200'N; verbatimLongitude: 101°16.923'E; Event: samplingProtocol: pitfall traps; year: 2007; month: 6; day: 1-15; Record Level: institutionCode: IZCAS-Ar 43147 Type status: Paratype. Occurrence: recordedBy: Guo Zheng ; individualCount: 1; sex: male; lifeStage: adult; Taxon : order: Araneae ; family: Ctenidae ; genus: Ctenus ; Location : country: China; stateProvince: Yunnan; municipality: Xishuangbanna ; locality: Mengla County ; verbatimLocality: Menglun Town , Xishuangbanna Tropical Botanical Garden , Paramichelia baillonii plantation (about 20 yr.); verbatimElevation: 608 ± 11 m a.s.l.; verbatimLatitude: 21°54.200'N; verbatimLongitude: 101°16.923'E; Event: samplingProtocol: pitfall traps; year: 2007; month: 6; day: 1-15; Record Level: institutionCode: IZCAS-Ar 43148 Type status: Paratype. Occurrence: recordedBy: Guo Zheng ; individualCount: 1; sex: female; lifeStage: adult; Taxon : order: Araneae ; family: Ctenidae ; genus: Ctenus ; Location : country: China; stateProvince: Yunnan; municipality: Xishuangbanna ; locality: Mengla County ; verbatimLocality: Menglun Town , Xishuangbanna Tropical Botanical Garden , Rubber plantation (about 20 yr.); verbatimElevation: 585 ± 10 m a.s.l.; verbatimLatitude: 21°54.684'N; verbatimLongitude: 101°16.319'E; Event: samplingProtocol: pitfall traps; year: 2007; month: 7; day: 1-15; Record Level: institutionCode: IZCAS-Ar 43149 Type status: Paratype. Occurrence: recordedBy: Guo Zheng ; individualCount: 1; sex: female; lifeStage: adult; Taxon : order: Araneae ; family: Ctenidae ; genus: Ctenus ; Location : country: China; stateProvince: Yunnan; municipality: Xishuangbanna ; locality: Mengla County ; verbatimLocality: Menglun Town , Xishuangbanna Tropical Botanical Garden , Paramichelia baillonii plantation (about 20 yr.); verbatimElevation: 608 ± 11 m a.s.l.; verbatimLatitude: 21°54.200'N; verbatimLongitude: 101°16.923'E; Event: samplingProtocol: pitfall traps; year: 2007; month: 6; day: 1-15; Record Level: institutionCode: IZCAS-Ar 43150

Description

Male (IZCAS-Ar 43147): PL 6.7, PW 5.3, AW 2.5, OL 5.8, OW 4.0. Eye diameters and interdistances: AME 0.25, ALE 0.22, PME 0.29, PLE 0.26, AME-AME 0.14, AME-ALE 0.33, PME-PME 0.20, PME-PLE 0.39, AME-PME 0.16, ALE-PLE 0.15, clypeus AME 0.17, clypeus ALE 0.62. Palp and leg measurements: palp 7.1 (2.6, 1.0, 1.3, -, 2.2), I 21.3 (5.6, 2.6, 5.8, 5.4, 1.9), II 19.3 (5.4, 2.4, 4.8, 4.9, 1.8), III 15.8 (4.4, 2.2, 3.2, 4.4, 1.6), IV 23.4 (5.8, 2.5, 5.8, 7.4, 1.9). Leg formula 4123. Spination of palp and legs: palp 141, 100, 1010; femora I p121, d111, r112, II p122, d121, r212, III p112, d111, r012, IV p112, d111, r012; patellae 101; tibiae I p011, d111, r110, v22222, II p100, d101, r102, v22222, III-IV p11, d111, r11, v222; metatarsi I-II p111, r111, v223, III p112, r112, v222, IV p112, d010, r112, v2222. Chelicerae with 3 promarginal, 4 retromarginal teeth and with elongated patch of 23 tiny denticles along entire cheliceral furrow. Retromargin of chelicerae close to fang base with 4-5 bristles. Sparse scopula restricted almost entirely to tarsi, only metatarsi I-II with sparse scopula hairs. Right leg claw I with 4 secondary teeth. Position of tarsal organ: I 1.82, II1.46, III 1.19, IV 1.56.

Palp (Fig. 4 A-C). Palpal tibia with strong RTA, with broad base and blunt tip. Cymbium tip slightly conical, retro-proximally with distinct pointed extension. Embolus arising at 7.30- o’clock-position, short and with three apophyses, its tip situated in distal half of tegulum. Conductor arising at 12- o’clock-position distally, partly fused with tegulum. Tegular apophysis arising at 6- o’clock-position from tegulum, distinctly excavated on prolateral side (arrowed in Fig. 4 A).

Colour (Fig. 5 F and G). Reddish-brown to yellowish with darker patterns. Dorsal prosoma with light median band with characteristic widening behind eyes and some white hairs; with distinctly marked fovea and indistinct radial markings. Sternum, ventral coxae III + IV and gnathocoxae yellowish, with dark patterns, labium brown with dark patterns, coxae I + II yellowish without patterns. Chelicerae with longitudinal lines in proximal half and with dark distal half. Leg femora and patellae reddish-brown-yellowish, tibia to tarsi yellowish. Dorsal opisthosoma yellowish, mottled with dark spots. Lateral opisthosoma yellowish with dark spots. Ventral opisthosoma black with white patches; epiandrium and muscle sigilla light. Anterior lateral spinnerets dark, posterior lateral and median spinnerets and anal tubercle light.

Female (IZCAS-Ar 43149): PL 6.0, PW 4.7, AW 3.0, OL 5.8, OW 4.1. Eye diameters and interdistances: AME 0.23, ALE 0.16, PME 0.31, PLE 0.27, AME-AME 0.21, AME-ALE 0.40, PME-PME 0.25, PME-PLE 0.46, AME-PME 0.16, ALE-PLE 0.20, clypeus AME 0.13, clypeus ALE 0.52. Palp and leg measurements: palp 5.9 (2.0, 1.1, 1.2, -, 1.6), I 13.5 (3.6, 2.3, 3.5, 2.9, 1.2), II 13.3 (3.6, 2.3, 3.3, 3.0, 1.1), III 11.3 (3.4, 1.7, 2.3, 2.8, 1.1), IV 16.0 (3.9, 2.2, 3.8, 4.6, 1.5). Leg formula 4123. Spination of palp and legs: palp 131, 100, 1111, 2101; femora I p021, d111, r111, II p112, d111, r 111, III p212, d111, r112, IV p101, d111, r001; patellae I-II 000, III-IV p010, r010; tibiae I-II v22222, III p11, d110, r11, v222, IV p11, d111, r11, v222; metatarsi I-II v222, III p112, r112, v222, IV p112, d010, r112, v2222. Chelicerae with 3 promarginal, 4 retromarginal teeth and with elongated patch of 22 tiny denticles along entire cheliceral furrow. Retromargin of chelicerae close to fang base with 5 thin bristles. Sparse scopula restricted almost entirely to tarsi, only metatarsi I-II with sparse scopula hairs. Palpal claw with 5 secondary teeth. Right leg claw I with 2 secondary teeth. Position of tarsal organ: I 1.01, II 0.94, III 0.89, IV 1.16.

Copulatory organ (Fig. 5 A and B). Epigynal field with two separate anterio-lateral patches, close to these patches two slit sense organs. Median plate narrowed anteriorly, widening medially and narrowing posteriorly again, posteriorly with subparallel margins, lateral teeth situated at widest part. Posterior epigyne with indistinct lateral furrows. Internal duct system with two large lateral folds running diagonally from medially to laterally. Spermathecae separated from each other by more than their diameter, with a small round chamber between spermathecae and fertilisation ducts, the latter pointing medially.

Colour (Fig. 5 H and I). As in male, except for: sternum dark brown, ventral coxa IV yellowish with dark pattens, labium and gnathocoxae brown. Chelicerae reddish-brown.

Variation: Paratype male (IZCAS-Ar 43148): PL 5.7, OL 4.7. Second female paratype (IZCAS-Ar 43150): PL 6.4, OL 6.8.

Diagnosis

Medium Ctenidae (total length male 10.4-12.5, female 11.8-13.2). The species resembles C. theodorianum Jäger, 2012 (see Jäger 2012: figs. 92-115) by having similar male RTA (Fig. 4 B) and female copulatory organ (Fig. 5 A and B), but can be easily distinguished by tegular apophysis undivided in ventral view (Fig. 4 B; divided in two parts in C. theodorianum ) and with distinct excavation prolaterally (arrowed in Fig. 4 A; indistinct excavation on dorsal side in C. theodorianum ), by the embolus with three apophyses, its tip situated in distal half of tegulum (Fig. 4 B; embolus with two apophyses, its tip situated almost centrally in C. theodorianum ), by the leg III in males with indistinct and not strongly swollen ventral hump covered by small stout spines on the proximal femur (arrowed in Fig. 5 C and D; more distinctly swollen in C. theodorianum ) and by the tibia III in males without ventral cone-shaped humps (Fig. 5 C and E; present in C. theodorianum ).

Etymology

The specific name refers to the type locality (Banna is a short name for Xishuangbanna) and is a noun in apposition.

Distribution

China (Yunnan, type locality, Fig. 1 ).

Figures

Figure 1. Distribution records of new and newly-recorded ctenid species from Xishuangbanna Tropical Botanical Garden in Yunnan Province, China. 1. Amauropelma yunnan sp. nov.; 2. Ctenus banna sp. nov.; 3. C. robustus Thorell, 1897; 4. C. yulin sp. nov.

Figure 4. Ctenus banna sp. nov., holotype male. A Palp, prolateral view, arrow points at excavation; B Palp, ventral view; C Palp, retrolateral view. C = conductor, E = embolus, RCB = retrolateral cymbial bulge, RTA = retrolateral tibial apophysis, TA = tegular apophysis. Scale bar: 0.20 mm (A-C).

Figure 5. Ctenus banna sp. nov. A Paratype female, epigyne, ventral view; B Paratype female, vulva, dorsal view; C Holotype male, leg III, prolateral view, arrow points at hump; D Holotype male, femur III, ventral view, arrow points at hump; E Holotype male, tibia III + metatarsus III, ventral view; F Holotype male, habitus, dorsal view; G Holotype male, habitus, ventral view; H Paratype female, habitus, dorsal view; I Paratype female, habitus, ventral view. ET = epigynal teeth, FD = fertilisation duct, SP = spermathecae, SS = slit sensillum. Scale bars: 0.20 mm (A, B), 1.00 mm (C-E), 2.00 mm (F-I).