Chrysometa aramba Levi, 1986

Massanti, Thiago B., Cavichioli, Rodney R. & Ott, Ricardo, 2018, On the genus Chrysometa (Araneae, Tetragnathidae) in south Brazil, Iheringia, Série Zoologia (e 2018001) 108, pp. 1-11 : 2

Chrysometa aramba Levi, 1986

( Figs 1-14 , 38 )

Chrysometa aramba LEVI, 1986:144 , figs. 231-233. Male holotype from Cambará do Sul, Rio Grande do Sul, Brazil, 9.I.1976, A. A. Lise leg., deposited in MCN 3348 (examined).

Other material examined. BRAZIL, Rio Grande do Sul: Canela *, ♀, 28.IX.2000, A. L. H. Silva leg. ( MCN 33360 ); São Francisco de Paula, ♂, 25.XI.1998, A. L. H. Silva leg. ( MCN 30960 ); ♀, 1.II.1999, A. L. H. Silva leg. ( MCN 30883 ); Candelaria *, ♀, 5.II.2001, R. Ott leg. ( MCN 33619 ) .

Diagnosis. This species is very close to C. boquete Levi, 1986 by having a discrete conical apophysis on the dorso-proximal region of the cymbium with no ectobasal or ectomedian process in males ( Figs 4, 5 ; see also LEVI, 1986:138, 139, figs 190, 191) and by the presence of a large knob-like epigynal septum and reniform shaped spermatheca with wrapped spermatic ducts in females ( Figs 9-14 ; see also LEVI, 1986:138, 139, figs 185-188). Males of C. aramba ( Figs 1-5 ) can be also distinguished by the palp bearing a flattened, oval shaped paracymbial apophysis, with bulged prolateral border and smooth lower end ( Figs 4, 5 ), which is corniculate in C. boquete . Females can be further distinguished by the almost as wide as long trapezoidal shaped median knob-like septum ( Figs 9, 10 ), which is wider than long in C. boquete .

Description. Female ( MCN 33360). Carapace orange ( Fig. 6 ). Chelicerae brown ( Figs 7, 8 ). Sternum, endites and labium brown darker on borders ( Fig. 7 ). Legs I and II orange with darker marks on distal regions of femur, patella and tibia regions ( Figs 6-8 ). Opisthosoma oval; dorsally with two longitudinal brown spots on anterior region; posteriorly chevron like pattern formed by brown transverse bars ( Fig. 6 ); lateral of abdomen with silver spots in the all extension ( Fig. 8 ). Ventral region dark gray, with two whitish stripes ( Fig. 7 ). Measurements (mm): AME 0.063; ALE 0.042; PME 0.084; PLE 0.042; AME - AME 0.042; AME - ALE 0.063; PME – PME 0.084; Total Length 2.90; Carapace 1.18 long, wide 0.97; Femur I 1.73; Patella + Tibia I 2.01; Metatarsus I 1.87; Tarsus I 0.61; Patella + Tibia II 1.37; Patella + Tibia III 0.74; Patella + Tibia IV 1.05.

Male. See LEVI, 1986:143, 144, figs. 231-233.

Variation. Total length: males, 2.70*-2.91 (* LEVI, 1986:144 data); females, 2.90-3.43.

Distribution. Known only for Rio Grande do Sul State, Brazil.

Figures

Figs 1-5. Chrysometa aramba Levi, 1986. 1-3 male holotYpe MCN 3348, 4-5 male MCN 30960. 1, dorsal; 2, ventral; 3, lateral; 4, palp (retrolateral view); 5, paracYmbiUm (retrolateral view). Scale bars: Figs 1-3, 1 mm; Figs 4, 5, 0.1 mm.

Figs 6-14. Chrysometa aramba Levi, 1986. 6-8 female MCN 33619, 9-14 female MCN 30833. 6, dorsal; 7, ventral; 8, lateral; 9, epigYne (posterior region); 10, epigyne (ventral view); 11, epigyne (ventral view clearead); 12, epigyne (dorsal view clearead); 13, epigyne (ventral view); 14, epigyne (dorsal view) (mks, median knob-like septUm; spd, spermatic dUct; spe, spermathecae). Scale bars: Figs 6-8, 1 mm; Figs 9-14, 0.1 mm.

Figs 38, 39. 38, Meridional Brazil with records of Chysometa aramba, C. cambara and C. itaimba; 39, meridional Brazil with records of Chysometa boraceia and C. ludibunda. Markations indicate records of species, black filled ones indicate herein presented new records.