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The Wandering Spiders of the Genus Ctenus (Ctenidae, Araneae) of Reserva Ducke, a Rainforest Reserve in Central Amazonia 81-98 ©Staatl

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The Wandering Spiders of the Genus Ctenus (Ctenidae, Araneae) of Reserva Ducke, a Rainforest Reserve in Central Amazonia 81-98 ©Staatl ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Andrias Jahr/Year: 1994 Band/Volume: 13 Autor(en)/Author(s): Höfer Hubert, Brescovit Antonio Domingos, Gasnier Thierry Artikel/Article: The wandering spiders of the genus Ctenus (Ctenidae, Araneae) of Reserva Ducke, a rainforest reserve in central Amazonia 81-98 ©Staatl. Mus. f. Naturkde Karlsruhe & Naturwiss. Ver. Karlsruhe e.V.; download unter www.zobodat.at andrias, 13: 81-98, 10 Figs, 3 Colour Plates; Karlsruhe, 30. 9. 1994 81 H u b e r t H o f e r , A n t o n io D. Br e s c o v it & T h ie r r y G a s n ie r The wandering spiders of the genusCtenus (Ctenidae, Araneae) of Reserva Ducke, a rainforest reserve in central Amazonia Abstract grafien wiedergegeben, um die Unterscheidung der Arten im Seven species of wandering spiders belonging to the genus Feld zu ermöglichen. Vorläufige Kenntnisse zur Biologie, Öko­ Ctenus were collected during an ecological inventory of spi­ logie und Biogeographie der Arten werden zusammengefaßt. ders in a forest reserve in the Brazilian Amazon near Manaus. The males of Ctenus crulsi and Ctenus villasboasi are descri­ Authors bed for the first time and the females are redescribed. Males Dr. Hubert Höfer , Staatliches Museum für Naturkunde, Post­ and females of Ctenus amphora and Ctenus minor are rede­ fach 6209, D-76042 Karlsruhe, Germany; scribed. Ctenus planipes is synonymized with Ctenus minor. M. Sc. Antonio D. Brescovit , Museu de Ciencias Naturais, Three species are described as new species: Ctenus inaja, Fundagäo Zoobotänica do Rio Grande do Sul, C. Postal 1188, Ctenus manauara and Ctenus tapereba. Colour patterns of CEP 90001-970, Porto Alegre, RS, Brazil; the species are shown by colour photographs and described M. Sc. Thierry Gasnier , Instituto Nacional de Pesquisas da from living specimens to allow recognition and separation of Amazonia (INPA), C. Postal 478, CEP 69011-970, Manaus, species in the field. Informations about natural history, ecology AM, Brazil. and regional distribution of the species are added. Resumo As aranhas errantes do géneroC te n u s (Ctenidae, Ara­ 1. Introduction neae) da Reserva Ducke, uma reserva de floresta tropical húmida na Amazonia central In 1991 we started an ecological field programm plan­ Sete espécies de aranhas do género Ctenus foram coletadas ned to study „Mechanisms maintaining high diversity durante um levantamento ecológico de aranhas dentro de uma in spider communities in the tropics“ with an inventory reserva florestal na Amazonia brasileira perto de Manaus. Os machos de Ctenus crulsi e Ctenus villasboasi sao descritos of spider species on the ground, on tree trunks and in pela primeira vez e as fémeas sao redescritas. Machos e the canopy of a neotropical rainforest site (Reserva fémeas de Ctenus amphora e Ctenus minor sâo redescritos. Ducke). Collecting was realized during 15 months by Ctenus planipes é sinonimizado com Ctenus minor. Très the mean of different trap types (pitfall traps, arboreal novas espécies sâo descritas: Ctenus inaja, Ctenus manauara funnel traps, ground photoeclectors), by insecticidal e Ctenus tapereba. Mostram-se padröes de coloraçâo das canopy fogging and diurnal and nocturnal manual espécies através de fotografías a cores e descriçôes de espé- collecting in different strata. cimens vivos para possibilitar reconhecimento e separaçâo das espécies no campo. Informaçôes sobre historia natural, For the purpose of a future study of coexistence of ecología e distribuiçâo regional sâo dadas. large wandering spiders in the lower strata of the rain­ forest we observed and collected the members of this Kurzfassung guild during more than two years, principally at night Die Laufspinnen der GattungC ten u s (Ctenidae, Araneae) with the aid of cap lamps. Altogether we collected der Reserva Ducke, eines Regenwaldreservats in Zen-fourteen species of Ctenidae and two species of Ancy- tralamazonien lometes (Pisauridae). Two species of the genus Pho- Während einer ökologischen Bestandsaufnahme der Spinnen in einem Regenwaldreservat bei Manaus in Zentralamazonien neutria were frequently observed head down in the wurden sieben Ctenus-Arten gesammelt. Die Männchen von lower vegetation, but rarely on the ground. An unde­ Ctenus crulsi und Ctenus villasboasi werden erstmals scribed species of the genus Gephyroctenus was beschrieben und die Weibchen wiederbeschrieben. Männ­ collected on tree trunks, and Enoploctenus sp. and chen und Weibchen von Ctenus amphora und Ctenus minor Cupiennius sp. were very abundant sitting on leaves werden wiederbeschrieben. Ctenus planipes wird synonymi- of low plants. Two species of the genus Centroctenus, siert mit Ctenus minor. Drei Arten werden erstmals beschrie­ C. ocelliventer and C. sp., were observed most often ben: Ctenus inaja, Ctenus manauara und Ctenus tapereba. in the lower vegetation and only rarely on the ground. Die Lebendfärbung der Arten wird im Text und durch Farbfoto- The Ctenus species and both species of Ancylometes seem to be the real ground living species in Reserva Ducke, although they also appear in lower vegetation Funded by „Deutsche Forschungsgemeinschaft“ (SPP and on lower parts of tree trunks. „Mechanismen der Aufrechterhaltung tropischer Diversität“) This paper is supposed to provide enough informati­ and „Deutsche Gesellschaft für Technische Zusammenarbeit“ ons to recognize the Ctenus species in the field and ©Staatl. Mus. f. Naturkde Karlsruhe & Naturwiss. Ver. Karlsruhe e.V.; download unter www.zobodat.at 82 andrias, 13 (1994) thus can serve as a base for ecological studies in the Ciéncias, Pontificia Universidade Católica do Rio Grande do central Amazon region. A future field study will con­ Sul, Porto Alegre (A.A. Lise ); MNB, Museum für Naturkunde, centrate on the question of how these seven morpho­ Berlin (M. Moritz); MNRJ, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro (A. Timotheo da logically very similar species co-occur in a given habi­ Costa); MZS, Museo Zoologico de La Specola, Firenze (S. tat. Mascherini ); MZSP, Museu de Zoología, Universidade de Säo Taxonomy and systematics of Ctenus are in a poor Paulo, Säo Paulo (J. L. Leme ); SMNK, Staatliches Museum für state, about 150 species have been described in the Naturkunde, Karlsruhe (H. Höfer ); UA, Universidade do Ama­ genus from the neotropics and certainly many of them zonas, Manaus (N.O. Aguiar). will not remain as valid species in the genus after a Descriptions basically follow Peck (1981). All measurements sorrow revision. Unfortunately the type species of the are in millimeters. Photographs in colour plates were all made by H. Hófer . genus, Ctenus dubius Walkenaer ,1805 is lost and a generic revision, including redefinition and limitation of the genus is far from the range of our present work. We are conscient of problems describing new species 3. Descriptions of species in a genus that is not at all resolved. We therefore tried to examine all types of species which have been Ctenus amphora Mello-Leitao described for the Amazon area and made a collecting Figures 1,2; colour plate 1a-d trip to Santarém (Para), the type locality of several Ctenus species. By providing descriptions of the Ctenus amphora Mello -Leitao , 1930: 64, figs 22, 23 (holoty- unknown males of two species and redescriptions of pe from Cumina River, Para, Brazil, G. Cruls col., not exami­ ned, should be in MNRJ nr. 159, not localized, probably lost); males and females described nearly a century ago, 1936: 6, pr. 1, fig. 6; 1948: 174, figs 16-17 (description of resolving a new synonymy and presenting a sorrow male); Roewer (1954: 647); Bonnet (1956: 1274). description of three new species we hope to contribute Ctenus senex: Caporiacco , 1948: 679 (in part, only two fema­ to a better understanding of the group. Including infor­ les, examined). mations about habitats and regional distributions we Note: The male described by Mello -Leitao (1948) from many hope to stimulate future taxonomic work. localities in Guiana was not examined. These records need a future confirmation. Diagnosis: Ctenus amphora resembles Ctenus minor 2. Study area and Methods but differs in body size and details of leg spination and details of palpus and epigynum: the modified metatar­ Collections were made in the northern part of the „Reserva Florestal Adolfo Ducke" of Instituto Nacional de Pesquisas da sus IV with a great number of spinules on the prolate­ Amazonia (INPA), situated 26 km from Manaus at the highway ral side (fig. 2), the enlarged basal embolar projection Manaus-ltacoatiara (AM-010; 2°55’S, 59°59’W). Geology and with numerous teeth and the bilobed tip of the embo­ botany of the reserve are described in Gentry (1990). All lus on male palps (fig. 1a,b) and the anteriorly strongly collection sites are covered by non-inundated terra firme - invaginated epigynum with medianly originating lateral forest. The intense study site of about 5 hectars Is situated on spurs (fig. 1c,d). a small plateau, appr. 1,5 km distant from the reserve station. Description: Male (Reserva Florestal Adolfo Ducke, Collections and observations were made in an area of about Manaus, Amazonas): Carapace reddish brown, pars 10 hectars around this site and along the dirt road leading to the plateau. Collecting methods are described in Hófer thoracica pale brown around the dark brown thoracic (1990) - ground photoeclectors and arboreal funnel traps, and groove; black rings around eyes. Legs brown, with in Hófer et al. (1994) - canopy fogging. ventral faces of coxae and femora lighter. Chelicerae Additional material came from várzea and igapó inundation reddish brown. Endites and labium greenish brown, forests near Manaus (Hófer 1990) and the following terra lighter at tips. Sternum reddish brown with white spots firme areas near Manaus: „Reserva de Campiña" of INPA and at the middle and near lateral borders. Abdomen dark reserve 1501 (Fazenda Esteio) of the „Projeto Dinámica Bioló­ gray, dorsum with two median black spots and darker gica de Fragmentos Florestais" (PDBFF, INPA/Smithsonian Institution).
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