Isoctenus guadalupei ( Mello-Leitão, 1941 ) Polotow & Brescovit, 2019
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publication ID |
https://doi.org/ 10.11646/zootaxa.4683.2.8 |
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DOI |
https://doi.org/10.5281/zenodo.3797573 |
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persistent identifier |
https://treatment.plazi.org/id/03E087ED-3C39-2864-FF09-1AB3FD9665E0 |
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treatment provided by |
Plazi |
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scientific name |
Isoctenus guadalupei ( Mello-Leitão, 1941 ) |
| status |
comb. nov. |
Isoctenus guadalupei ( Mello-Leitão, 1941) View in CoL comb. nov.
Figures 1−3 View FIGURE 1 View FIGURE 2 View FIGURE 3
Ctenus guadalupei Mello-Leitão, 1941: 215 View in CoL , figs 23–24 (female holotype from Guadalupe Norte [-28.9408, -59.5624], Província de Santa Fé, Argentina, M. Birabén coll., deposited in MLP 15180, examined); World Spider Catalog 2019.
Note. Type specimen with faded coloration and missing leg IV segments, except the femur and coxae. The male was matched by similarities of size and coloration, and by the close proximity from the type locality.
Additional material examined. ARGENTINA. Corrientes: Mburucuyá, Parque Nacional Mburucuyá (Sendero Che Roga, -28.0049, -58.0365, 85 m. a.s.l., manual collecting), 1 male, 27–30.V.2011, G. Rubio, M. Izquierdo & L. Piacentinni coll. (MACN-Ar 30496) GoogleMaps .
Diagnosis. Males of Isoctenus guadalupei comb. nov. ( Fig. 2A View FIGURE 2 ) resemble those of I. ordinario ( Polotow & Brescovit, 2009: fig. 9A–B) by the elongated dorsal branch of RTA, bifid tip of embolus and shape of median apophysis, but it can be distinguished by the presence of a basal retrolateral projection of embolus (RPE), shorter tibia of palp and cymbium, and embolus with larger base. Males of Isoctenus guadalupei also present a projection on each coxae IV ( Fig. 1C View FIGURE 1 ), which is absent in I. ordinario . Females of Isoctenus guadalupei resemble those of I. ordinario by the cordiform shape of the median field of epigynum and anterior position of lateral fields projections, but can be distinguished by the median field less excavated apically ( Fig. 2B View FIGURE 2 ) and the larger spermathecae and copulatory ducts ( Fig. 2C View FIGURE 2 ).
Description. Male (MACN-Ar 30496). Prossoma uniformly orange, darker in the dorsum; with brown thoracic groove and black rings around eyes; greyish dorsal opistossoma with light brown dorsal, folium-like marking ( Fig. 1 View FIGURE 1 A−B). Total length 10.20. Carapace 5.60 long and 4.35 wide. Eye diameters: AME 0.20, ALE 0.20, PME 0.25, PLE 0.24. Leg measurements: I: femur 6.90/ patella 2.80/ tibia 7.10/ metatarsus 6.87/ tarsus 3.00/ total 26.67; II: 5.93/ 2.55/ 5.80/ 5.90/ 2.55/ 22.73; III: 5.16/ 2.00/ 5.00/ 5.65/ 2.15/ 19.96; IV: 7.00/ 2.25/ 6.70/ 8.90/ 2.90/ 27.75. Leg spination: tibia I-II v2-2-2-2-2, r0, p0, III-IV v2-2-2, r1-1, p1-1; metatarsus I-II v2-2-2, r0, p0, III v2-2-2, r1-1-1, p-1-1-1, IV v1-1-1-1- 1-2, r1-1-1, p1-1-1. Coxa IV with a ventral projection ( Fig. 1C View FIGURE 1 ). Palp ( Figs 1D View FIGURE 1 , 2A View FIGURE 2 ): tibia approximately two thirds of cymbium length; RTA with ventral branch subtriangular; tibia with short and curved ventral apophysis; cymbium with ventral retrolateral projection reduced and dorsal retrolateral projection rounded; short and laminar embolus, with bifid tip and short basal projection; robust median apophysis, with conical anterior and posterior projections.
Female (MLP 15180). Coloration faded, ranging from light brown to beige in the whole specimen. Total length 11.60. Carapace 5.50 long and 4.20 wide. Clypeus 0.17 high. Eye diameters: AME 0.26, ALE 0.20, PME 0.31, PLE 0.27. Leg measurements: I: femur 5.20/ patella 2.50/ tibia 5.00/ metatarsus 4.20/ tarsus 1.80/ total 18.70; II: 4.70/ 2.60/ 4.40/ 3.80/ 1.60/ 17.10; III: 4.20/ 2.00/ 3.50/ 3.70/ 1.50/ 14.90; IV: 5.60/ -/ -/ -/ -/ -. Leg spination: tibia I-II v2-2-2-2-2, r0, p0, III-IV v2-2-2, r1-1, p1-1; metatarsus I-II v2-2-2, r0, p0, III v2-2-2, r1-1-1, p-1-1-1. Epigynum ( Fig. 2 View FIGURE 2 B−C): subrounded median field; lateral spurs short, partially covered by the median field and with a pointed tip. Spermathecae with rounded head and large base.
Distribution. Corrientes and Santa Fé Provinces, northeastern Argentina ( Fig. 3 View FIGURE 3 ). Isoctenus ordinario is commonly found in the Parana Dominion of Brazil and Argentina, while I. guadalupei is only found in the Chacoan province (part of the Chacoan Dominion) ( Fig. 3 View FIGURE 3 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
