Glenognatha timbira , ,

Jimmy Cabra-García & Antonio D. Brescovit, 2016, Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae), Zootaxa 4069 (1), pp. 1-183: 144-148

publication ID

http://doi.org/10.11646/zootaxa.4069.1.1

publication LSID

lsid:zoobank.org:pub:52FC658C-78C7-49FC-9961-8AC43CA03101

persistent identifier

http://treatment.plazi.org/id/8E0E8F67-7D9D-FF1B-ACBA-0F01FCEED537

treatment provided by

Plazi

scientific name

Glenognatha timbira
status

new species

Glenognatha timbira  new species

( Figs. 118–121View FIGURE 118View FIGURE 119View FIGURE 120View FIGURE 121, 135View FIGURE 135)

Types. Male holotype from Parque Nacional da Serra dos Órgãos, Teresópolis, Rio de Janeiro, Brazil, [22º29´35´´S, 43º4´24´´W], elev. [1700m], 20–23.x.2006, Exped. Arachné leg., deposited in MNRJ 6399View MaterialsGoogleMaps  ; paratypes: 3♂ 3♀ 2 immature with the same data of the holotype, deposited in MNRJ 6598View MaterialsGoogleMaps  ; 1♂ from Túnel do Garrafão , Alagoa, Minas Gerais, Brazil, 22º11´S, 44º44´W, elev. [1340m], 31.ix.2008, L.F.O. Bernardi leg., deposited in UFMG 8790View Materials.GoogleMaps 

Etymology. The species epithet is a noun in apposition that refers to the Timbiras indigenous tribes, first inhabitants of the type locality.

Diagnosis. Males of G. timbira  resemble those of G. emertoni  , G. minuta  and G. gouldi  by the enlarged Ret2 and Ret3 ( Figs. 119B –CView FIGURE 119). It can be distinguished from G. emertoni  by the absence of a mesally oriented distal projection on the cheliceral basal segment ( Fig. 119 AView FIGURE 119); distinguished from G. minuta  by the smaller size of the Ret3 relative to Ret2 ( Fig. 119BView FIGURE 119) and from G. gouldi  by the slightly curved Ret2 ( Fig. 119BView FIGURE 119). Females can be distinguished from all other Glenognatha  species by the enlarged base of the Prt1 ( Fig. 119DView FIGURE 119).

Male (holotype). Habitus as in Figures 118 A –DView FIGURE 118. Carapace pale brown, darker along furrows. Sternum brown, darker on sides. Abdomen oval, dorsally with irregular pattern of two longitudinal black bands on sides that join medially at the posterior region forming thin transverse bands. Silver guanine spots scattered in two median longitudinal bands and on lateral surfaces. Venter with a pale black median band that ramifies towards the lateral surface from the tracheal spiracle. Silver guanine spots scattered in two lighter longitudinal bands between the tracheal spiracle and the epigastric furrow. Legs yellow-brownish. Tracheal spiracle well-sclerotized. Total length 3.75. Cephalothorax 1.75 long, 1.35 wide, 0.95 high. Abdomen 2.30 long, 1.80 wide, 1.80 high. Sternum 0.90 long, 0.90 wide. Eye diameters and interdistances: AME 0.12. ALE 0.10. PME 0.15. PLE 0.12. AME-AME 0.09, AME- ALE 0.12, PME-PME 0.15, PME-PLE 0.13, ALE-PLE 0.01. Clypeus height 1.80. Chelicerae with the same coloration of the cephalothorax and anteriorly projected ( Fig. 118CView FIGURE 118). Three promarginal and four retromarginal teeth. ( Figs. 119 A –CView FIGURE 119). Cheliceral fang curved ( Fig. 119CView FIGURE 119). Leg measurements: I: femur 2.40, patella 0.65, tibia 2.50, metatarsus 2.20, tarsus 1.10, total 8.85; II: 2.40, 0.65, 2.45, 2.00, 1.00, 8.50; III: 1.60, 0.40, 1.25, 1.15, 0.57, 4.97; IV: 1.80, 0.45, 1.60, 1.40, 0.62, 5.87. DTS 0.32. DTE 0.70. Palp as in Figures 120E –HView FIGURE 120. Paracymbium with distal and basal portions subequal ( Fig. 120HView FIGURE 120). Embolus long with a nearly 90º curved tip ( Figs. 120 A, D, GView FIGURE 120).

Female ( MNRJ 6400). Coloration and general habitus as in male ( Figs. 118E –HView FIGURE 118). Abdomen with four dusky longitudinal bands. Pale patch anterior to the gonopore. Tracheal spiracle well-sclerotized. Total length 3.85. Cephalothorax 1.75 long, 1.50 wide, 1.15 high. Abdomen 2.35 long, 2.00 wide, 1.85 high. Sternum 1.00 long, 0.95 wide. Eye diameters and interdistances: AME 0.12. ALE 0.12. PME 0.15. PLE 0.13. AME-AME 0.11, AME-ALE 0.16, PME-PME 0.17, PME-PLE 0.16, ALE-PLE 0.01. Clypeus height 1.70. Chelicerae with the same coloration of the cephalothorax. Three promarginal and four retromarginal teeth ( Figs. 119D –FView FIGURE 119). Ret1 with a basal enlargement ( Fig. 119DView FIGURE 119). Leg measurements: I: femur 2.80, patella 0.75, tibia 2.75, metatarsus 2.25, tarsus 1.10, total 9.65; II: 2.50, 0.65, 2.37, 2.10, 1.05, 8.67; III: 1.60, 0.50, 1.20, 1.25, 0.70, 5.25; IV: 2.00, 0.40, 1.95, 1.50, 0.75, 6.60. DTS 0.27. DTE 0.25. Tracheal system as in Figures 121D –GView FIGURE 121. Spinnerets as in Figures 121H –JView FIGURE 121. Genitalia without spermathecae ( Fig. 121 A –CView FIGURE 121). Uterus externus rectangular, with a median projection ( Fig. 121 A, CView FIGURE 121).

Variation. Male total length 3.2–3.7 (N = 5; average 3.5), cephalothorax length 1.5–1.7 (N = 5; average 1.6), femur I length 2.2–2.5 (N = 5; average 2.3). Female total length 3.7–4.5 (N = 5; average 3.9), cephalothorax length 1.6–2.0 (N = 5; average 1.8), femur I length 2.0–2.8 (N = 5; average 2.4).

Distribution. Known from São Paulo, Rio de Janeiro and Minas Gerais states in Brazil ( Fig. 135View FIGURE 135).

Additional material examined (N = 3). BRAZIL: Minas Gerais: Bocaina de Minas , [22º9´53.85´´S, 44º23´27.55´´W], elev. [1169m], 1–3.i.2008, E. H. Wienskoski leg., 1 immature ( MNRJ 5034View Materials)GoogleMaps  . Rio de Janeiro: Teresópolis, Parque Nacional da Serra dos Órgãos ,, [22º29´35´´S, 43º4´24´´W], elev. [1700m], 4.viii.1996, 1♀ ( MNRJ 6400View Materials)GoogleMaps  . São Paulo: São José do Barreiro, Parque Nacional da Serra da Bocaina , [22º43´S, 44º36´W], elev. [900m], 28.iv –3.v.2002, Equipe Biota leg., 1♀ ( IBSP 68554View Materials)GoogleMaps  .

DTE

Centro de Investigaciones Cient�ficas y Transferencia de Tecnolog�a a la Producci�n (CICyTTP-CONICET)

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro