Isoctenus guadalupei ( Mello-Leitão, 1941 ) Polotow & Brescovit, 2019

Polotow, Daniele & Brescovit, Antonio D., 2019, Almost eight decades later: description of the male of Isoctenus guadalupei (Mello- Leitão, 1941) comb. nov. and redescription of the female, Zootaxa 4683 (2), pp. 291-294 : 292-293

publication ID

https://doi.org/ 10.11646/zootaxa.4683.2.8

publication LSID

lsid:zoobank.org:pub:5C967EE8-61AB-4ED1-BD56-B0B60074CBA7

DOI

https://doi.org/10.5281/zenodo.3797573

persistent identifier

https://treatment.plazi.org/id/03E087ED-3C39-2864-FF09-1AB3FD9665E0

treatment provided by

Plazi

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 ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Ctenidae

Genus

Isoctenus

Loc

Isoctenus guadalupei ( Mello-Leitão, 1941 )

Polotow, Daniele & Brescovit, Antonio D. 2019
2019
Loc

Ctenus guadalupei Mello-Leitão, 1941: 215

Mello-Leitao, C. F. de 1941: 215
1941
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