Isoctenus segredo Polotow & Brescovit 2009, SP. NOV.
Creators: name: Polotow, Daniele
name: Brescovit, Antonio D.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Ctenidae
Isoctenus
Isoctenus segredo

description: ISOCTENUS SEGREDO SP. NOV. (FIG. 11A–D)    Type material: Male holotype from Usina Hidrelétrica de Segredo, Reservatório do Rio Jordão, Candói / Mangueirinha, Paraná, Brazil, 3.v.1996, R. Bertani, deposited in IBSP 7227. Paratypes: 1 female from the same locality and collector as holotype, 24.iv– 4.v.1996, deposited in IBSP 58386; 1 male and 1 female from the same locality and collector as holotype, 24.iv–4.v.1996, deposited in IBSP 58387.   
 Additional material examined: BRAZIL. Paraná: Candói / Mangueirinha, Usina Hidrelétrica de Segredo, Reservatório do Rio Jordão, 2 male, 6 females (IBSP 7201–7203, 8034).   
 Etymology: The species epithet is a toponymy in apposition and it is a Portuguese noun meaning ‘secret’.   
 Diagnosis: Isoctenus segredo sp. nov. resembles I. charada sp. nov. by the morphology of the RTA in male palp (Fig. 11A, B), but can be distinguished by the short and slender median apophysis and the basal projection of embolus short in male palp (Fig. 11A) and by the subquadrangular median field, large lateral spurs and spermathecae with a reduced head and large base in the epigynum (Fig. 11C, D).   
 Description: Male (holotype). Coloration as in I. foliifer, except carapace with longitudinal lighter stripe from the eyes to the posterior margin and a lighter arrow mark on abdomen dorsum. Total length 9.80. Carapace 5.40 long and 3.90 wide. Clypeus 0.12 high. Eyes diameters: AME 0.18, ALE 0.14, PME 0.26, PLE 0.24. Leg measurements: I: femur 4.00/ patella 2.10/ tibia 4.40/ metatarsus 3.70/ tarsus 1.90/ total 16.10; II: 4.00/ 1.80/ 3.80/ 3.20/ 1.50/ 14.30; III: 3.60/ 1.60/ 3.40/ 3.20/ 1.50/ 13.30; IV: 4.80/ 1.90/ 4.80/ 5.00/ 1.90/ 18.40. Leg spination as in I. foliifer, except metatarsus I and II r1-1 p-1-1. Palp: tibia short, approximately half of the cymbium length; RTA with ventral branch conical and dorsal branch short and robust with internal grooves; tibia with short and curved ventral apophysis (Fig. 11A, B). Cymbium with conical ventral retrolateral projection and short dorsal retrolateral projection; short and laminar embolus with rounded tip; median apophysis with anterior and posterior projections short and conical (Fig. 11A).   
 Female (IBSP 58386). Coloration as in male. Total length 12.30. Carapace 5.00 long and 4.10 wide. Clypeus 0.20 high. Eye diameters: AME 0.18, ALE 0.20, PME 0.26, PLE 0.24. Leg measurements: I: femur 4.00/ patella 2.20/ tibia 3.80/ metatarsus 3.00/ tarsus 1.40/ total 14.40; II: 3.90/ 1.80/ 3.60/ 2.80/ 1.40/ 13.50; III: 3.50/ 1.40/ 2.80/ 3.00/ 1.30/ 12.00; IV: 4.70/ 1.90/ 4.50/ 5.10/ 1.80/ 18.00. Leg spination as in I. foliifer, except tibia II p1-1. Epigynum: median field with anterior margin smooth and posterior margin slightly projected; lateral spurs not covered by the median field and with rounded tip (Fig. 11C). Ventral wall with a fold covering part of the spermathecae (Fig. 11D).   
 Variation: Three males: total length 8.30–8.90, carapace 4.40–4.60, femur I 4.00–4.10; seven females: total length 9.80–13.50, carapace 4.70–5.40, femur I 3.80–4.20.   
 Distribution: Southern Brazil, State of Paraná.
description: Published as part of Polotow, Daniele & Brescovit, Antonio D., 2009, Revision and cladistic analysis of Isoctenus and description of a new neotropical genus (Araneae, Ctenidae, Cteninae), pp. 583-614 in Zoological Journal of the Linnean Society 155 (3) on page 600, DOI: 10.1111/j.1096-3642.2008.00452.x, http://zenodo.org/record/5444903