RESUMO
The systematics and taxonomy of Neotropical stephanopines have been extensively studied over the last years (Machado et al. 2015; Silva-Moreira Machado 2016; Machado et al. 2017, 2018; Prado et al. 2018). According to Machado et al. (2017), the genera Epicadus Simon, Epicadinus Simon and Onocolus Simon form a clade of taxa with characteristic structure of the male genitalia, consisting of a long and filiform embolus, discoid tegulum and the canoe-shaped RTA fused at the basis with an acute and curved DTA. However, the better diagnostic characters are remarkable somatic features and the structure of the female genitalia. While Epicadus present large species with three or five stout opisthosomal projections, elevated thoracic portion, sometimes presenting a median spire (Machado et al. 2018), Epicadinus is composed of smaller spiders with just three pointed opisthosomal projections and the tegument covered by elongated needle-shaped setae, which give these spiders a spiny appearance (Prado et al. 2018). The species of Onocolus, on the other hand, can be recognized by the dorsoventrally compressed prosoma, pentagonal opisthosoma, female genitalia with coiled or S-shaped copulatory ducts and predominant green body coloration. The genus Onocolus has been revised by Lise (1981). Here, we describe O. ankeri sp. nov., a species from the Amazon Forest that is remarkable by its size and color (Fig. 1).
Assuntos
Aranhas , Distribuição Animal , Estruturas Animais , Animais , Feminino , Florestas , Masculino , Tamanho do ÓrgãoRESUMO
The genus Titidius Simon, 1895 belongs to the family Thomisidae Sundevall, 1833 and can be easily identified from the related genera Tmarus Simon, 1875 and Acentroscelus Simon, 1886 by the high carapace, anterior eye row straight and posterior eye row recurve-;pd in dorsal view, carapace smooth with moderate setation, abdomen longer than wide, legs long, slender and setose and clypeus vertical (Esmerio Lise 1996). It is currently composed of 20 species, all occurring in Brazil with exception of Titidius ignestii Caporiacco, 1947 from Guyana (World Spider Catalog 2017). Eight species are distributed in the Amazon region (Esmerio Lise 1996): T. caninde Esmerio Lise, 1996, T. gurupi Esmerio Lise, 1996, T. multifasciatus Mello-Leitão, 1929 and T. rubrosignatus (Keyserling, 1880) from Pará; T. galbanatus (Keyserling, 1880) from Amazonas and Pará; T. quinquenatus Mello-Leitão, 1929 and T. urucu from Amazonas; and T. rubescens Carporiacco, 1947 from Amazonas and Roraima.