Scytodes chapeco, Rheims, Cristina A. & Brescovit, Antonio D., 2009

Rheims, Cristina A. & Brescovit, Antonio D., 2009, New additions to the Brazilian fauna of the genus Scytodes Latreille (Araneae: Scytodidae) with emphasis on the Atlantic Forest species, Zootaxa 2116, pp. 1-45 : 40-41

Scytodes chapeco new species

Figs. 141–146

Type material: Holotype: male from Monte Alegre [27°18' S; 50°25' W], Chapecó , Santa Catarina, Brazil, 2001–2002, J.M. Marques, deposited in IBSP 91945.

Paratypes: BRAZIL. Paraná: Pinhão [25°43' S; 51°37' W] (Barra do Capoteiro, Usina Hidrelétrica de Segredo), 13, 21 February 1992, R. Pinto da Rocha ( MZSP 14682). Rio Grande do Sul: São Valentin [27°33' S; 52°31' W], 13 1Ƥ, 16 October 1976, S. Scherer ( IBSP 36504); Encantado [29°15' S; 51°52' W], 1Ƥ, 24 May 1986, A D. Brescovit (MCN 15117); Igrejinha [29°34' S; 50°47' W], 13 3Ƥ, 19 October 1967, P. de Biasi ( MZSP 7665); Canela [29°22' S; 50°49' W] (Barragem dos Bugres), 33 23, 1–4 November 1999, A.B. Bonaldo, ( IBSP 38346; MCN 32064); Guaíba [30°06' S; 51°19' W] (Fazenda São Maximiliano), 13, 26 August 1994, A.A. Lise ( MCTP 6031).

Other material examined. BRAZIL. Santa Catarina: Nova Teutônia [27o 11`S; 52o23`W], 13, F. Plaumann ( SMF 1821); Rio Grande do Sul: Derrubadas [27°00'– 27°02' S; 53°40'– 54°10' W] (Parque Estadual do Turvo ), 63, 11–18 January 2002, Equipe Biota ( IBSP 92356; 92364; 92362; 92360; 92366; 92357); São Valentin [27°33' S; 52°31' W], 23 6Ƥ 5 juvs., 16 October 1976, S. Scherer (MCN 4677; 4693); Garruchos [28°10' S; 55°38' W], 13 7Ƥ 2 juvs, 6 December 1975, A.A Lise, (MCN 3208; 3178); Caxias do Sul [29°10' S; 51°10' W] (Água Azul), 1Ƥ, 15 September 1976, M.I. Tavares (MCN 4471); Encantado [29°15' S; 51°52' W], 1Ƥ, 21 September 1985, A D. Brescovit (MCN 14527); Canela [29°22' S; 50°49' W], 13 5Ƥ 1juv., 26 December 1984, A A Lise (MCN 2466); (Barragem dos Bugres), 63 2Ƥ 8juvs., 1–4 November 1999, A B. Bonaldo (MCN 30688).

Etymology. The specific name is a noun in apposition that refers to the type locality of the holotype.

Diagnosis. Scytodes chapeco n.sp. is distinguished from the remaining Neotropical Scytodes by truncated and bifid distal area of the male palpal bulb ( Figs. 142, 144 ) and by the inconspicuous positioning ridges in the female epigynum ( Fig. 145 ).

Description. Male (Holotype, IBSP 91945). Carapace orange with brown pattern as shown on Fig. 141 . Chelicerae pale yellow with longitudinal brown stripe. Pedipalps yellow. Palpal tibiae with longitudinal, prolateral brown stripe. Labium orange with brown margins and large brown mark at base. Endites pale yellow. Sternum pale yellow with brown markings in front of each coxae, extending towards the center. Legs yellow, except patella I brown. Femora I-IV with pair of ventral, longitudinal brown stripes. Tibiae I-IV with transversal median brown stain. Abdomen pale yellow with black pattern ( Fig. 141 ). Total length 3.0. Carapace slightly domed, 1.7 long, 1.4 wide. Eye diameters: PME 0.10, ALE 0.12, PLE 0.12. Lateral eyes on a tubercle. Chelicerae with subapical hyaline keel and inconspicuous stridulatory ridges. Labium 0.10 long, 0.18 wide. Sternum 0.94 long, 0.76 wide. Leg measurements: I: femur 3.0, patella 0.4, tibia 3.3, metatarsus 3.8, tarsus 0.6, total 11.1; II: 2.2, 0.4, 2.3, 2.4, 0.5, 7.8; III: 1.4, 0.4, 1.3, 1.4, 0.4, 4.9; IV: 2.1, 0.4, 1.9, 2.0, 0.6, 7.0. Palpal femur with short and stout stridulatory pick with rounded and projected socket. Cymbium with single strong distal spine ( Fig. 142 ). Bulb 0.82 long, medially constricted and slightly bent, forming a small dorsal hump ( Figs. 142–143 ). Distal region truncated and bifid with a long retrolateral sclerotized process ( Figs. 142–144 ). Abdomen 1.3 long, 1.4 wide, covered with slender hairs.

Female (Paratype, MZSP 7665). Coloration pattern as in male. Total length 5.1. Carapace domed, 2.3 long, 2.0 wide. Eye diameters: PME 0.16, ALE 0.14, PLE 0.16. Lateral eyes on a tubercle. Chelicerae as in male. Labium 0.20 long, 0.22 wide. Sternum 1.26 long, 0.94 wide. Leg measurements: I: femur 3.1, patella 0.6, tibia 3.4, metatarsus 4.2, tarsus 0.7, total 12.0; II: 2.4, 0.6, 2.4, 2.9, 0.6, 8.9; III: 1.7, 0.6, 1.4, 1.8, 0.5, 6.0; IV: 2.3, 0.6, 2.2, 2.5, 0.6, 8.2. Palpal femur as in male. Epigynum with inconspicuous positioning ridges ( Fig. 145 ). Vulva with slightly oval spermathecae on short and narrow stalks, adjacent to large oval hyaline pockets, partially fused at base, with no conspicuous sclerotized area ( Fig. 146 ). Abdomen 2.8 long, 2.3 wide, as in male.

Variation. Ten males: total length 3.5–5.9; carapace 2.0–2.6; femur I 4.6–5.7; bulb 0.58–0.82. Ten females: total length 4.5–5.1; carapace 2.1–2.4; femur I 3.0–3.7.

Distribution. Atlantic Forest. Known from the states of Paraná, Santa Catarina e Rio Grande do Sul.

Figures

FIGURES 141 – 152. 141 – 146. Scytodes chapeco n. sp. 141. Male habitus, dorsal. 142 – 144. Left male palp (142 prolateral, 143 retrolateral, 144 detail of distal region, dorsal). 145 – 146. Female epigynum (145 ventral, 146 dorsal). 147 – 152. Scytodes imbituba n. sp. 147. Male habitus, dorsal. 148 – 150. Left male palp (148 prolateral, 149 retrolateral, 150 detail of distal region, dorsal). 151 – 152. Female epigynum (151 ventral, 152 dorsal) (SP = sclerotized process). Scale lines: 0.5 mm.