Oecobius concinnus Simon, 1892

Santos, Adalberto J. & Gonzaga, Marcelo O., 2003, On the spider genus Oecobius Lucas, 1846 in South America (Araneae, Oecobiidae), Journal of Natural History 37 (2), pp. 239-252 : 245-246

Oecobius concinnus Simon

(figures 7–11, 17, 20, 21)

Oecobius concinnus Simon, 1893: 435 , pl. 9, figure 2 (female holotype and male paratype from Puerto Cabello , Venezuela, in Musée National d’Histoire Naturelle , Paris , not examined); Shear, 1970: 141–143, figures 4, 5, 15, 31, 32, 52, 53; Platnick, 1993: 160.

Oecobius sp. indet. b, Baum, 1972: 120–122, figures 23–25.

Tarapaca concinna; Lehtinen, 1996: 393.

Note. Baum’s (1972) illustrations of Oecobius sp. indet. b (figures 23–25) were based on two unidentified females from Recife (state of Pernambuco, Brazil) deposited in the Senckenberg Museum, Frankfurt, Germany. These illustrations perfectly correspond to the epigynum of O. concinnus , and although the original specimens were not obtained for this study, specimens were examined from a locality very close to Recife (São José da Coroa Grande, Pernambuco).

Diagnosis. The carapace of O. concinnus has lateral spots, like O. navus , but differs in their half-moon shape (figure 7).The male palpus differs from that of the other species by the articulated OTL1, with a broad concave base and an apical curved and pointed process (figures 9–11, 20). The epigynum is composed of a sclerotized plate (figure 21) with the interior ducts visible by transparency, and a posterior, wrinkled soft region (figure 8).

Description. Complete description available in Shear (1970). For description and illustration of female epigynum see Baum (1972).

Natural history. We collected several specimens in the same urban microhabitats described for O. navus . A. J. Santos collected a female in a building of the Estação de Silvicultura Tropical, an Amazonian forest reserve. Baert et al. (1989) collected several specimens in many different habitats in the Galapagos Islands, including steppe forest, beach vegetation and under rocks.

Distribution. Florida, West Indies, Central America (Shear, 1970) and probably introduced in Polynesia (Lehtinen, 1996). In South America this species was recorded in the Galapagos Islands, north, north-east and central regions of Brazil, extending to the south-east, close to the coast (figure 17).

Material examined. Ecuador: Galápagos: Sta Cruz Island, Academy bay , ECCD, 30 m, 10–14 July 1985, S. and J. Peck, three W, one X ( AMNH); 10 May to 14 July

1985, one X, nine W (AMNH). Brazil: Acre: Rio Branco, Campus UFAC, 4 April 96, A. D. Brescovit and A. B. Bonaldo, one X ( IBSP6973 ) ; Amazonas: Manaus , 18 July 1999, A. J. Santos, four X ( IBSP26157 ) ; Reserva Florestal Adolpho Ducke , 24 November 1993, M. Christofer, one X, one juv. ( IBSP10775 ) ; Estação Experimental de Silvicultura Tropical , 30 July 1999, A. J. Santos, one X ( IBSP26158 ) ; Pernambuco: São José da Coroa Grande , 5 January 2000, H. F. Medeiros, one W, two X ( IBSP26159 ) ; Sergipe: São Cristóvão , November 1996, A. D. Brescovit, one X ( IBSP7650 ) ; Bahia: Itororó , 29 November 2000, A. J. Santos, two X ( IBSP26760 ) ; Ilhéus , 18 November 2000, A. J. Santos, four W, 10 X, one juv. ( IBSP26761 ) ; Caravelas , November 1999, G. F. Dutra, five X ( IBSP26161 ) ; Caravelas, Arquipélago de Abrolhos, Santa Bárbara island , 4 March 1996, G. F. Dutra, one X ( IBSP26160 ) ; Mato Grosso: Cuiabá, Campus UFMT, 17 February 2000, G. Q. Romero, three X ( IBSP26162 ) ; Rio de Janeiro: Campos , 15 November 2000, A. J. Santos, one X ( IBSP26762 ) ; Monsuaba , 1 January 2000, M. O. Gonzaga, two W, one X, two juv. ( IBSP26163 ) ; Volta Redonda , September 1999, M. O. Gonzaga, nine X, three juv. ( IBSP26164 ) ; 11 October 1999, three W, 14 X, nine juv. ( IBSP26763 ) ; São Paulo: Cananéia , 21 February 2000, M. O. Gonzaga, one W ( IBSP26165 ) .