Description of Toca, a new neotropical spider genus (Araneae, Ctenidae, Calocteninae).
Abstract: Toca new genus is proposed to include two new species: the type species T. bossanova new species from Rio de Janeiro, Brazil, and T. samba new species from Parana and Minas Gerais, Brazil. Toca may be related to Caloctenus Keyserling and Gephyroctenus Mello-Leitao, with which it shares the scales on the abdominal dorsum and the epigynum as a single, slightly sclerotized, fold. The genus can be distinguished among the Calocteninae genera by its unique genital structures.

Keywords: Systematics, taxonomy, Brazil
Article Type: Report
Subject: Spiders (Identification and classification)
Spiders (Physiological aspects)
Spiders (Distribution)
Zoology (Identification and classification)
Zoology (Research)
Authors: Polotow, Daniele
Brescovit, Antonio D.
Pub Date: 05/01/2009
Publication: Name: Journal of Arachnology Publisher: American Arachnological Society Audience: Academic Format: Magazine/Journal Subject: Biological sciences; Zoology and wildlife conservation Copyright: COPYRIGHT 2009 American Arachnological Society ISSN: 0161-8202
Issue: Date: May, 2009 Source Volume: 37 Source Issue: 2
Topic: Event Code: 690 Goods & services distribution; 310 Science & research Advertising Code: 59 Channels of Distribution Computer Subject: Company distribution practices
Geographic: Geographic Scope: Brazil Geographic Code: 3BRAZ Brazil
Accession Number: 238834231
Full Text: The subfamily Calocteninae was proposed by Simon (1897) based mainly on the shape of the labium, sternum, and carapace; and by the numerous and elongated spines on the first and second pairs of legs. Currently it contains four genera: Caloctenus Keyserling 1877 and Gephyroctenus Mello-Leitao 1936, both from South America; Diallomus Simon 1897 from Sri Lanka; and Apolania Simon 1898 from the Seychelles Islands (Silva 2003; Platnick 2008). The subfamily is characterized by the following synapomorphies: presence of a set of elongated spines on tibia and metatarsus of the first and second pairs of legs, six thickened and elongated setae on the anal tubercle, and a reduced number of cylindrical gland spigots on the posterior median spinnerets (Silva 2003).

In addition to the four Calocteninae genera already described, we propose the new genus Toca to include two new species: T. bossanova from Rio de Janeiro, Brazil, and T. samba from Parana and Minas Gerais, Brazil. Toca may be related to Caloctenus and Gephyroctenus, with which it shares scales on the abdominal dorsum and epigynum as a single, slightly sclerotized fold (Silva 2003, 2004; Polotow & Brescovit 2008). Toca can be distinguished by the unique genital structures within the subfamily, which support the proposal of a new genus. The material examined belongs to Instituto Butantan, Sao Paulo (IBSP, A. D. Brescovit) and Museum National d'Histoire Naturelle, Paris (MNHN, C. Rollard). All measurements are in millimeters. Terminology follows Silva (2003).

TAXONOMY

Ctenidae Keyserling 1877 Calocteninae Simon 1897 Toca new genus Figs. 1-9

Type species.--Toca bossanova new species

Etymology.--The generic name is an arbitrary combination of letters. The gender is feminine.

Diagnosis.--Toca resembles Caloctenus and Gephyroctenus by the presence of scales on the abdominal dorsum (Silva 2003; Silva 2004). Males can be distinguished by an embolus with a rounded base (Figs. 4, 8) and large conductor (Figs. 1, 7) with a surrounding groove to accomodate the embolus (Figs. 3, 8). The female of T. bossanova resembles the female of Diallomus fuliginosus (type specimen, deposited in MNHN, examined) with the epigynum containing a slightly sclerotized single fold and an anterior hood (Fig. 5). The female can be distinguished from the remaining genera by the elongated copulatory ducts and anterior glandular projection (Fig. 6) of the epigynum. The female of T. samba is unknown.

Description.--Ecribellate ctenids. Total body length (males and females) 3.40-4.40. Carapace pale brown with longitudinal lighter stripe from eyes to posterior margin of carapace; chelicerae, labium, endites, sternum, and legs pale brown; posterior median and lateral eyes on black tubercles; legs with dorsal, transverse dark spots. Carapace flattened. Eyes: ctenoid pattern, 2-4-2. Chelicerae: three prolateral teeth and five to six small retrolateral teeth. Labium short, wider than long. Fovea short, positioned in posterior third of carapace. Legs I and II with set of numerous elongated spines on femur, tibia, and metatarsus. Trochanter slightly notched. Abdomen flattened, subpentagonal. Six erect bristles distally positioned on anal tubercle. Palp: tibia short; RTA divided into ventral and dorsal branches (Figs. 1, 2, 7, 9); cymbium with retrolateral basal projection (Figs. 3, 7); subtegulum prolateral; tegulum covered by conductor; median apophysis hook shaped (Figs. 1, 7); embolus surrounding tegulum, supported by conductor; conductor sclerotized ventrally, with retrolateral laminar projection supporting embolus tip (Figs. 2, 8). Epigynum: formed by single plate, slightly sclerotized, with anterior hood (Fig. 5); spermathecae rounded; fertilization ducts short, emerging from spermathecal base (Fig. 6).

Composition.--Two species: Toca bossanova new species and T. samba new species

Distribution.--Southern and southeastern Brazil.

Toca bossanova new species

Figs. 1-6

Type material.--Male holotype from Fazenda Ranchinho Porto da Roca, Petropolis, 22[degrees]30'39"S, 43[degrees]11'4"W, Rio de Janeiro, Brazil, 12-14 November 1999, deposited in IBSP 62920; female paratype from the same locality, 8-15 February 2000, Equipe Biota, deposited in IBSP 62919; male paratype from the same locality, 15-16 August 2001, Equipe Biota, deposited in IBSP 90669.

Etymology.--The species epithet is a Portuguese noun that refers to a popular rhythm of Brazilian music.

Diagnosis.--Toca bossanova can be distinguished from T. samba by the elongated cymbium and conductor, the elongated retrolateral projection of the conductor, and the slender and thin median apophysis on the male palp (Figs. 1-4). The females can be recognized by the presence of an anterior epigynal hood (Fig. 5) and elongated copulatory ducts, overlayed with small glands (Fig. 6) in the epigynum.

[FIGURES 1-6 OMITTED]

Description.--Male (IBSP 62920): Total length 3.40. Carapace 1.50 long and 1.40 wide. Clypeus 0.07 high. Eye diameter: AME 0.10, ALE 0.08, PME 0.10, PLE 0.10. Leg measurements: I: femur 1.60/ patella 0.50/ tibia 1.80/ metatarsus 1.70/ tarsus 0.60/ total 6.20; II: 1.70/ 0.45/ 1.85/ 1.90/ 0.60/ 6.50; III: 1.80/ 0.40/ 1.75/ 1.85/ 0.70/ 6.50; IV: 1.90/ 0.40/ 1.60/ 2.10/ 0.90/ 6.90. Leg formula: 42=31. Leg spination: tibiae I and II with eight ventral pairs of spines; metatarsi I with six ventral pairs of spines; metatarsi II with five ventral pairs of spines. Abdomen brown with posterior area white. Palp: ventral branch of RTA laminar (Fig. 1); prolateral area of tegulum visible in ventral view, with laminar process (Fig. 4).

Female (IBSP 62919): Total length 4.40. Carapace 1.60 long and 1.60 wide. Clypeus 0.08 high. Eye diameter: AME 0.10, ALE 0.08, PME 0.12, PLE 0.12. Leg measurements: I: femur 1.50/ patella 0.50/ tibia 1.80/ metatarsus 1.60/ tarsus 0.50/ total 4.90; II: 1.80/ 0.60/1.80/1.60/ 0.60/6.40; III: 1.80/ 0.50/1.60/1.80/ 0.70/ 6.40; IV: 1.80/ 0.50/1.50/1.80/ 0.70/ 6.30. Leg formula: 2=341. Leg spination: tibiae I and II with eight ventral pairs of spines; metatarsi I and II with six ventral pairs of spines. Coloration of the abdomen as in male. Epigynum as in generic description.

Additional material examined.--None.

Distribution.--State of Rio de Janeiro, Brazil.

Toca samba new species

Figs 7-9

Type material.--Male holotype from Morro do Cabral, Lagoa, Tijucas do Sul, 25[degrees]55'37"S, 49[degrees]10'44"W, Parana, Brazil, November 2000, J. Ricetti, deposited in IBSP 39239; male paratype from Parque Estadual de Vila Velha, Ponta Grossa, 25[degrees]4'60"S, 50[degrees]8'60"W, Parana, Brazil, 8 December 1986, Profaupar/CIIF, deposited in IBSP 62915; male paratype from Mata Grande, Parque Estadual do Ibitipoca, Lima Duarte, 21[degrees]51'10"S, 43[degrees]47'60"W, Minas Gerais, Brazil, 27-29 October 1997, B. M. Souza, deposited in IBSP 23812.

[FIGURE 7-9 OMITTED]

Etymology.--The species epithet is a Portuguese noun which refers to a popular rhythm of Brazilian music.

Diagnosis.--Toca samba can be distinguished from T. bossanova by the rounded cymbium and conductor, median laminar projection on the conductor, and robust median apophysis on male palp (Figs 7-9).

Description.--Male (IBSP 39239): Total length 4.00. Carapace

1.60 long and 1.50 wide. Clypeus 0.08 high. Eye diameter: AME 0.10, ALE 0.08, PME 0.10, PLE 0.10. Leg measurements: I: femur 1.80/ patella 0.60/ tibia 2.00/ metatarsus 1.80/ tarsus 0.70/ total 6.90; II: 1.90/ 0.60/ 2.00/ 1.80/ 0.80/ 7.10; III: 2.10/ 0.50/ 1.90/ 1.90/ 0.90/ 7.30; IV: 2.20/ 0.50/ 2.00/ 2.20/ 1.00/ 7.90. Leg formula: 4321. Leg spination: tibiae I and II with eight ventral pairs of spines; metatarsi I and II with six ventral pairs of spines. Abdomen medially pale brown, with two anterior white spots, lateral area brown and posterior area white. Palp: ventral branch of RTA elongated (Fig. 9); subtegulum reduced, not visible in ventral view.

Female: Unknown.

Additional material examined.--None.

Distribution.--States of Parana and Minas Gerais, Brazil.

DISCUSSION

To date, there are only two Calocteninae genera described from South America: Caloctenus and Gephyroctenus. Caloctenus contains four valid species and can be distinguished by leg spination, carapace shape, strongly sclerotized male palpal tibia at apex, and median apophysis with an apical beak. These characters were considered apomorphic by Silva (2004). Gephyroctenus contains eight species and can be distinguished by the following synapomorphies: a cymbial retrolateral groove, retrolateral origin of embolus, long and thin embolus, median apophysis with a subdistal hook, hyaline projection close to the embolus base in the male palp, fused median and lateral fields in a single epigynal plate, copulatory opening located dorsally in an atrium, and elongated copulatory ducts surrounding the spermathecae in the female epigynum (Polotow & Brescovit 2008). The two species described in this paper cannot be assigned to these previously described genera. In addition to the unique morphological characters on the male palp and female epigynum, as described above, they lack the apomorphic features that characterize Caloctenus and Gephyroctenus.

Caloctenus and Gephyroctenus are closely related by the presence of four retrolateral teeth in the chelicerae, reduced anterior lateral eye lenses, and cylindrical glands with an enlarged base on the posterior median spinnerets (Silva 2003). Toca also has reduced anterior lateral eye lenses, but five to six retrolateral teeth. The presence of the cylindrical glands with an enlarged base on the posterior median spinnerets in Toca should be confirmed in the future with scanning electronic microscopy.

The males of Toca share the long and filiform embolus on the male palp with Gephyroctenus.ThefemalesofToca resemble the type species of Diallomus, D. fulliginosus, from Sri Lanka (female type specimen deposited in the MNHN, examined), both by the single, slightly sclerotized epigynal fold and the anterior hood on the female epigynum. Therefore, the relationship of Toca new genus to other Calocteninae genera awaits cladistic analysis with all the genera assigned to Calocteninae and representatives of the remaining subfamilies of Ctenidae.

ACKNOWLEDGMENTS

We are grateful to Cristina Rheims, Gustavo Ruiz, Ingi Agnarsson, and the anonymous reviewers for helpful suggestions on the manuscript. We wish to thank Cristine Rollard, curator of MNHN, for providing the type material for this study. This study was supported by CNPq and FAPESP (grant nos. 99/05446-8 and 06/55230-7). This study is part of the BIOTA/FAPESP--The Biodiversity Virtual Institute Program (www.biotasp.org.br).

Manuscript received 14 March 2008, revised 24 November 2008.

LITERATURE CITED

Platnick, N.I. 2008. The World Spider Catalog, Version 8.5. American Museum of Natural History, New York. Online at http://research.amnh.org/entomology/spiders/catalog/index.html

Polotow, D. & A.D. Brescovit. 2008. Revision of the Neotropical spider genus Gephyroctenus (Araneae: Ctenidae: Calocteninae). Revista Brasileira de Zoologia 25:705-715.

Silva, D. 2003. Higher-level relationships of the spider family Ctenidae (Araneae: Ctenoidea). Bulletin of the American Museum of Natural History 274:1-86.

Silva, D. 2004. Revision of the spider genus Caloctenus Keyserling, 1877 (Araneae, Ctenidae). Revista Peruana de Biologia 11:5-26.

Simon, E. 1897. Histoire naturelle des araignees. Librairie encyclopedique de Roret, Paris 2:1-192.

Daniele Polotow: Departamento de Zoologia, Instituto de Biociencias, Universidade de Sao Paulo, Sao Paulo, SP, Brazil. E-mail: danielepolotow@yahoo.com.br

Antonio D. Brescovit: Laboratorio de Artropodes, Instituto Butantan, Avenida Vital Brasil, 1500, CEP 05503-900, Sao Paulo, SP, Brazil. E-mail: adbresc@terra.com.br

(1) Current address: Laboratorio de Artropodes, Instituto Butantan, Avenida Vital Brasil, 1500, CEP 05503-900, Sao Paulo, SP, Brazil.
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