Scytodes ytu, 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: 34-35

publication ID

http://doi.org/ 10.5281/zenodo.187984

persistent identifier

http://treatment.plazi.org/id/174E87B6-FF89-B557-98D6-F8E6FB6D40A9

treatment provided by

Plazi

scientific name

Scytodes ytu
status

new species

Scytodes ytu   new species

Figs. 124–129 View FIGURES 118 – 129. 118 – 123

Type material: Holotype: male from Parque Nacional de Foz do Iguaçu [25 ° 36 ' S; 54 ° 25 ' W], Foz do Iguaçu, Paraná, Brazil, 3–12 March 2002, Equipe Biota, deposited in IBSP 91897.

Paratypes: BRAZIL. Paraná: Jundiaí do Sul [23 ° 26 ' S; 50 ° 16 ' W], 13, 22 December 1986, Equipe PROFAUPAR ( MCN 20375 View Materials ); Santa Helena [24 ° 55 ' S; 54 ° 22 ' W] (Refúgio Biológico de Santa Helena), 13 1 Ƥ, 21 March 1991, A.B. Bonaldo ( MCN 20953 View Materials ), Foz do Iguaçu [25 ° 36 ' S; 54 ° 25 ' W] (Parque Nacional de Foz do Iguaçu), 23 3 Ƥ, 3–12 March 2002, Equipe Biota ( IBSP 91890; 91893; MZSP). Rio Grande do Sul: Derrubadas [27 ° 22 ' S; 53 ° 45 ' W] (Parque Estadual do Turvo   ), 13 3 Ƥ 2 juvs., 4–6 February 1980, A.A. Lise (MCN 8946).

Other material examined. BRAZIL. Paraná: Adrianópolis [24 ° 40 ' S; 48 ° 49 ' W], 13, 24 August 2004, D.M.B. Battesti ( IBSP 48081); 13, 23 August 2004, D.M.B. Battesti ( IBSP 47891); 13, 18 November 2004, D.M.B. Battesti ( IBSP 47951); 1 Ƥ, 15–19 November 2004, D.M.B. Battesti ( IBSP 48338); Cascavel [25 ° 23 ' S; 51 ° 31 ' W] (Lago Municipal de Cascavel), 23, 13 January 2007, A P.G. Silva ( IBSP 80147); Foz do Iguaçu [25 ° 36 ' S; 54 ° 25 ' W], 1 Ƥ, 19 March 1985, H. & L. Levi ( MCZ 53256 View Materials ); (Parque Nacional de Foz do Iguaçu), 5 Ƥ, 3–12 February 2002, Equipe Biota ( IBSP 91896; 91892, 91888; 91895). Santa Catarina: Chapecó   [27 °06' 10.5 " S; 52 ° 46 ' 48.8 " W] (Floresta Nacional de Chapecó   ), 33 5 Ƥ, January 2003 – December 2004, M. Scartezini ( IBSP 92527–92529; 92531–92534; 92537). Rio Grande do Sul: Derrubadas [27 °00'- 27 °02' S; 53 ° 40 '- 54 ° 10 ' W] (Parque Estadual do Turvo   ), 23 1 Ƥ, 11–18 January 2002, Equipe Biota ( IBSP 92358, 92365, 92359).

Etymology. The specific name is a noun in apposition, taken from the Tupi Indian language, that means waterfall and refers to the Iguaçu Waterfalls, one of the natural wonders of the world, located in the type locality of the species' holotype.

Diagnosis. The males of Scytodes ytu   n.sp. are distinguished from those of the remaining Neotropical Scytodes   by the retrolateral-ventral, triangular projection of the distal area of the palpal bulb ( Fig. 126 View FIGURES 118 – 129. 118 – 123 ). The females resemble those of S. chapeco   n.sp. by the large oval hyaline pockets and adjacent spermathecae ( Figs. 129 View FIGURES 118 – 129. 118 – 123 , 146 View FIGURES 141 – 152. 141 – 146 ) but are distinguished by the rounded spermathecae on thick stalks and rounded sclerotized areas in the hyaline pockets ( Fig. 129 View FIGURES 118 – 129. 118 – 123 ).

Description. Male (Holotype, IBSP 91987). Carapace orange with dark brown pattern, as shown on Fig. 124 View FIGURES 118 – 129. 118 – 123 . Chelicerae yellow with dorsal longitudinal brown stripe. Pedipalps orange. Palpal patellae with faint prolateral brown stain. Labium yellow, brown at base. Endites yellow. Sternum cream coloured with brown margins in front of each coxae. Legs yellow, except patella I brown. Femora I-IV with pair of ventral longitudinal brown stripes. Tibiae I-IV with brown ends. Abdomen gray with black pattern ( Fig. 124 View FIGURES 118 – 129. 118 – 123 ). Total length 3.9. Carapace domed, 2.0 long, 1.7 wide. Eye diameters: PME 0.14, ALE 0.14, PLE 0.14. Lateral eyes on a tubercle. Chelicerae with subapical hyaline keel and inconspicuous stridulatory ridges. Labium 0.14 long, 0.26 wide. Sternum 1.04 long, 0.86 wide. Leg measurements: I: femur 4.7, patella 0.6, tibia 5.1, metatarsus 6.2, tarsus 0.8, total 17.4; II: 3.3, 0.6, 3.4, 4.0, 0.6, 11.9; III: 2.2, 0.5, 2.0, 2.3, 0.6, 7.6; IV: 3.2, 0.6, 3.0, 3.3, 0.7, 10.8. Palpal femur with stridulatory pick short and stout on triangular and projected socket. Cymbium with strong distal spine and slender subdistal spine ( Fig. 125 View FIGURES 118 – 129. 118 – 123 ). Bulb 0.7, medially curved. Distal region concave with a prolateral sclerotized process ( Figs. 125, 127 View FIGURES 118 – 129. 118 – 123 ) and a retrolateral hyaline keel and ventral triangular projection ( Figs. 126–127 View FIGURES 118 – 129. 118 – 123 ). Abdomen 1.7 long, 1.1 wide, covered with slender hairs.

Female. (Paratype, MCN 8946). Coloration pattern as in male. Total length 4.7. Carapace domed, 2.3 long, 2.0 wide. Eye diameters: PME 0.14, ALE 0.14, PLE 0.14. Lateral eyes on a tubercle. Chelicerae as in male. Labium 0.16 long, 0.24 wide. Sternum 1.16 long, 0.90 wide. Leg measurements: I: femur 2.8, patella 0.5, tibia 3.1, metatarsus 3.7, tarsus 0.7, total 10.8; II: 2.4, 0.5, 2.2, 2.6, 0.6, 8.3; III: 1.7, 0.5, 1.3, 1.7, 0.5, 5.7; IV: 2.2, 0.5, 2.0, 2.3, 0.7, 7.7. Palpal femur as in male. Epigynum with very narrow positioning ridges, separated by half their width ( Fig. 128 View FIGURES 118 – 129. 118 – 123 ). Vulva with spermathecae on thick and short stalks, adjacent to hyaline pockets with rounded lateral sclerotized areas at base ( Fig. 129 View FIGURES 118 – 129. 118 – 123 ). Abdomen 2.4 long, 2.4 wide, as in male.

Variation. Seven males: total length 3.5–3.9; carapace 1.9–2.1; femur I 4.7–5.2; bulb 0.66–0.76. Ten females: total length 3.9–5.6; carapace 2.0– 2.7; femur I 2.8–3.7.

Distribution. Atlantic Forest. States of Paraná, Santa Catarina and Rio Grande do Sul.

IBSP

Instituto Biologico de Sao Paulo

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

MCZ

Museum of Comparative Zoology

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Scytodidae

Genus

Scytodes