Simó, Miguel, Álvarez, Luis & Laborda, Álvaro, 2016, The orb-weaving spider genus Chrysometa in Uruguay: distribution and description of a new species (Araneae, Tetragnathidae), Zootaxa 4067 (5), pp. 589-593: 589-591

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Genus Chrysometa  Simon, 1895

Type species. Chrysometa tenuipes (Keyserling, 1864)  by original designation.

Chrysometa pena  new species, Figures 1–4View FIGURE 1View FIGURE 2View FIGURE 3. A – CView FIGURE 4

Types. Male holotype from Uruguay, Departamento Rivera, Subida de Pena  , Ruta 30 (31 °08'S, 55 ° 55 'W), 29 /X/ 2010, A. Laborda & M. Simó coll. (FCE-Ar 6078). Four male and twelve female paratypes from the same locality and date: FCE- Ar 5973 (3 males, 9 females), FCE-Ar 6026 (1 female) FCE-Ar 6077 (1 male, 1 female), FCE-Ar 6079 (1 female).

Additional material examined. Uruguay: Departamento Treinta y Tres, Quebrada de los Cuervos (32 ° 55 'S, 54 ° 27 'W), 01/XI/ 2012, A. Laborda coll. FCE-Ar 5972 (1 male, 3 females); same data, 15–16 /XI/ 2013, FCE-Ar 5976 (2 females). Departamento Paysandú, Río Queguay, La Aguada (32 °05'S, 58 °01'W), 25 /I/ 2014, A. Laborda coll. FCE-Ar 5977 (2 females).

Etymology. The specific epithet, a name in apposition, refers to the type locality.

Diagnosis. Males of C. pena  resembles C. poas Levi, 1986  in the shape of the paracymbium, but differs in the larger cymbial processes ( Figs. 2View FIGURE 2 D, E, 3 A). Females of C. pena  differ from all other species of the genus in the presence of an inverted V-shaped groove, with heavy sclerotized margins, between the two humps of the epigynal median lobe ( Figs. 2View FIGURE 2 A, 3 B).

Description. Male (holotype). Carapace yellowish with a longitudinal dark band, broader on cephalic area ( Fig. 1View FIGURE 1 A). Lateral sides dark. Sternum, chelicerae, labium and endites brown. Legs yellowish with brown spots. Abdomen dorsally grey, laterally with transversal dark marks with white spots, ventrally grey with a longitudinal dark band and two white spots posterior to epigastric groove. Spinnerets grey. Total length 4.6. Carapace 2.2 long, 2.5 wide. Leg I length: Femur 5.0; patella+tibia 6.3; metatarsus 5.6; tarsus 1.4. Patella+tibia II 4.3; III 1.5; IV 2.4. Palp: Paracymbium “eight”-shaped, with the upper prong with similar size of the lower prong, in ventral view ( Fig. 3 AView FIGURE 3. A – C). Paracymbium tip apically bifid. Ecto-basal cymbial process pointed retrolaterally. Ecto-median cymbial process notably larger and pointed retrolaterally. Metaine embolic apophysis curved on the apical region ( Figs. 2View FIGURE 2 D, 3 A).

Female (paratype, FCE-Ar 6079). Color as in male ( Fig. 1View FIGURE 1 B). Total length 5.9; carapace 2.3 long, 1.8 wide. Leg I length: femur 3.5; patella+tibia 4.2; metatarsus 3.3; tarsus 1.0. Patella+tibia II 2.8; III 1.8; IV 2.1.

Epigynum: Median lobe with two humps separated by an inverted V-shaped groove with dark and sclerotized margins. Septum T-shaped with posterior membranous part and oval-shaped copulatory openings ( Figs. 2View FIGURE 2 A, C). Lateral plates convergent separated by a conspicuous membranous area ( Figs. 2View FIGURE 2 C, 3 B). Vulva: Spermathecae apical, reniform, with copulatory ducts curved below, opening near the septum. Fertilization ducts coiled. ( Figs. 2View FIGURE 2 B, 3 C).

Natural history. Chrysometa pena  builds the web near the ground in ravines next to watercourses. It also inhabits in riparian forests, where the webs are built at the base of tree trunks.

Distribution. Known for northern and eastern Uruguay ( Fig. 4View FIGURE 4).