Glenognatha timbira, Cabra-García & Brescovit, 2016

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

DOI

http://doi.org/10.5281/zenodo.5666982

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. 118–121 View FIGURE 118 View FIGURE 119 View FIGURE 120 View FIGURE 121 , 135 View 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 6399 View Materials GoogleMaps   ; paratypes: 3♂ 3♀ 2 immature with the same data of the holotype, deposited in MNRJ 6598 View Materials GoogleMaps   ; 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 8790 View 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–C View 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 A View FIGURE 119 ); distinguished from G. minuta   by the smaller size of the Ret3 relative to Ret2 ( Fig. 119B View FIGURE 119 ) and from G. gouldi   by the slightly curved Ret2 ( Fig. 119B View FIGURE 119 ). Females can be distinguished from all other Glenognatha   species by the enlarged base of the Prt1 ( Fig. 119D View FIGURE 119 ).

Male (holotype). Habitus as in Figures 118 A –D View 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. 118C View FIGURE 118 ). Three promarginal and four retromarginal teeth. ( Figs. 119 A –C View FIGURE 119 ). Cheliceral fang curved ( Fig. 119C View 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–H View FIGURE 120 . Paracymbium with distal and basal portions subequal ( Fig. 120H View FIGURE 120 ). Embolus long with a nearly 90º curved tip ( Figs. 120 A, D, G View FIGURE 120 ).

Female ( MNRJ 6400). Coloration and general habitus as in male ( Figs. 118E–H View 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–F View FIGURE 119 ). Ret1 with a basal enlargement ( Fig. 119D View 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–G View FIGURE 121 . Spinnerets as in Figures 121H–J View FIGURE 121 . Genitalia without spermathecae ( Fig. 121 A –C View FIGURE 121 ). Uterus externus rectangular, with a median projection ( Fig. 121 A, C View 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. 135 View 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 5034 View 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 6400 View 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 68554 View 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