Forest fragmentation has been intense in the eastern Amazon region, which has negatively affected wildlife populations. The speed of deforestation in this region underscores the urgent need to understand the effects of such changes on populations of endemic species, and to implement measures for ecosystem conservation. We analyzed the extent to which fragmented forests are still connected in the Xingu Area of Endemism, in the eastern Brazilian Amazon, and assigned conservation priority to fragments most important for connectivity maintenance. We structurally classified the Xingu landscape using the Morphological Spatial Pattern Analysis and ranked each fragment according to its importance using an Index of Connectivity. Our data revealed important differences in conservation potential across the region. Although most of the study area already receives some degree of protection, future conservation actions should prioritize the connection of habitat fragments to maximize dispersal potential and minimize genetic isolation of biodiversity components. We produced a map of prioritary areas for connectivity maximization. These areas include fragments with large core areas and high-quality fragments that provide connection among habitats which, together, should maintain crucial corridors for gene flow in a biologically-rich region of the Amazon.

A new species of Ricinulei of the genus Cryptocellus Westwood 1874 is described from the Madeira-Purus Interfluve, Amazonas, Brazil. It shares a set of apomorphies with Cryptocellus peckorum Platnick & Shadab 1977 and Cryptocellus tarsilae Pinto-da-Rocha & Bonaldo 2007, with which it forms an assemblage of related species herein named the peckorum group. A second group of species, the Cryptocellus adisi group, is formed by the following species:

Berlandiella Mello-Leitão, 1929 is currently composed of six Neotropical species, of which Berlandiella querencia Lise & Silva, 2011 is known only from female specimens; the other species of the genus were described based on both males and females. In this paper, we describe and illustrate Berlandiella zabelesp. nov., based on a few individuals collected in Sete Cidades National Park, Piracuruca and Brasileira, state of Piauí, Brazil. We illustrate and describe the previously unknown male of B. querencia, based on a specimen collected from Reserva Mocambo, Belém, state of Pará, Brazil. The taxa described herein have scopula in the tarsi and metatarsi, and the males have a cymbial process, characters recorded for the first time for the genus. Additionally, we present an updated diagnosis for Berlandiella.

Elaver O. Pickard-Cambridge, 1898 is characterized and redescribed, including 49 species occurring from the United States to Argentina. Thirty seven previously known species are redescribed: Elaver achuca (Roddy, 1966) revalidated, E. balboae (Chickering, 1937), E. barroana (Chickering, 1937), E. calcarata (Kraus, 1955), E. carlota (Bryant, 1940), E. chisosa (Roddy, 1966), E. crinophora (Franganillo, 1934), E. crocota (O. Pickard-Cambridge, 1896), E. albicans (Franganillo, 1930) name restored, E. depuncta O. Pickard-Cambridge, 1898, E. elaver (Bryant, 1940), E. excepta (L. Koch, 1866), E. grandivulva (Mello-Leitão, 1930), E. hortoni (Chickering, 1937), E. implicata (Gertsch, 1941), E. juana (Bryant, 1940), E. kohlsi (Gertsch & Jellison, 1939), E. linguata (F.O. Pickard-Cambridge, 1900), E. madera (Roddy, 1966), E. mirabilis (O. Pickard-Cambridge, 1896) new. comb., E. mulaiki (Gertsch, 1935), E. multinotata (Chickering, 1937), E. orvillei (Chickering, 1937), E. placida O. Pickard-Cambridge, 1898, E. portoricensis (Petrunkevitch, 1930), E. quadrata (Kraus, 1955), E. richardi (Gertsch, 1941), E. sericea O. Pickard-Cambridge, 1898, E. sigillata (Petrunkevitch, 1925), E. simplex (O. Pickard-Cambridge, 1896), E. texana (Gertsch, 1933), E. tigrina O. Pickard-Cambridge, 1898 name restored, E. tricuspis (F.O. Pickard-Cambridge, 1900), E. tristani (Banks, 1909), E. tumivulva (Banks, 1909), E. valvula (F.O. Pickard-Cambridge, 1900) and E. wheeleri (Roewer, 1933). Ten new species are described: E. candelaria n. sp. and E. helenae n. sp. from Mexico; E. arawakan n. sp. from Haiti; E. lizae n. sp. from Costa Rica; E. darwichi n. sp. from Ecuador; E. juruti n. sp., E. tourinhoae n. sp. and E. vieirae n. sp. from Brazil; E. shinguito n. sp. from Peru and E. beni n. sp. from Bolivia. The female of E. hortoni is described for the first time. Lectotypes are designated for E. sigillata and its actual female is described for the first time. Four new synonyms are proposed: E. languida (Gertsch, 1941) is synonimized with E. multinotata; E. dorothea (Gertsch, 1935) with E. wheeleri; E. exempta (Gertsch & Davis, 1940) with E. placida and E. vulnerata (Kraus, 1955) with E. calcarata. The drawings in the original descriptions of E. kawitpaaia (Barrion & Litsinger, 1995) and E. turongdaliriana (Barrion & Litsinger, 1995) are sufficiently informative to exclude these species from Elaver but not to accurately establish its generic affiliation. Thus, until the types become available for examination, these species must remain as Clubionidae incertae sedis. Heterochemmis (F.O. Pickard-Cambridge, 1900) is synonymized with Elaver and Heterochemmis mutatus Gertsch & Davis,1940 is recognized as a junior synonym of Elaver mirabilis n. comb., the type species of Heterochemmis. New records are presented for E. valvula, E. balboae, E. brevipes (Keyserling, 1891), E. grandivulva and E. lutescens (Schmidt, 1971). Two species described by Franganillo, E. tenera (Franganillo, 1935) and E. tenuis (Franganillo, 1935), are considered species inquirendae.

The genus Strotarchus Simon, 1888 is characterised for 18 species occurring from United States to Brazil. Seven previouslyknown species are redescribed: S. nebulosus Simon, 1888, the type species; S. praedator (O. Pickard-Cambridge, 1898); S. pis-catorius (Hentz, 1847); S. violaceus F.O. Pickard-Cambridge, 1899; S. minor Banks, 1909; S. tropicus (Mello-Leitão, 1917)and S. planeticus Edwards, 1958. Eleven new species are described: S. monasticus n. sp., S. mazamitla n. sp., S. tamaulipas n.sp., S. tlaloc n. sp., S. jacala n. sp., S. bolero n. sp. and S. michoacan n. sp. from Mexico; S. silvae n. sp. and S. urarina n. sp.from Peru; S. beepbeep n. sp. from United States and S. gandu n. sp. from Brazil. The male of S. minor and the female of S. tropicus are described for the first time.

All content of the journal, except where identified, is licensed under a Creative Commons attribution-type BY-NC. Species of Alpaida O. Pickard-Cambridge, 1889 are diurnal orb-weaving spiders occurring only in the Neotropical region. Currently, the genus is composed of 148 species (WORLD SPIDER CATALOG 2014), although it is estimated to contain about 200-300 species (LEVI 1988). Species of this genus are characterized by the glabrous body, orange to red carapace, abdomen and carapace without bristles; male palp with radix, embolus and terminal apophysis fused into one sclerite; mushroomshaped paramedian apophysis connected to conductor; epigynum usually represented by a transverse sclerotized structure, with posterior lips, a median scape and copulatory openings located on each side between plate and lips (LEVI 1988). Alpaida was revised by LEVI (1988), who dealt with 134 species, among which 94 were described as new. Many of the 40 previously known species had been erroneously transferred to Alpaida from different genera. Since LEVI's (1988) contribution only 11 species have been added to the genus: A. guto

An updated catalogue of type specimens of Acari, Palpigradi, Pseudoscorpiones, Ricinulei and Schizomida deposited in the Invertebrate Collection of the Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Brazil, is presented. A total of 19 holotypes and 23 lots of paratypes of 22 species of Acari; three lots of paratypes of one species of Palpigradi; 28 holotypes and 209 lots of paratypes of 30 species of Pseudoscorpiones; two holotypes and two lots of paratypes of two species of Ricinulei; and five holotypes and two lots of paratypes of six species of Schizomida are listed. Scientific names are listed alphabetically by family, followed by bibliographic citation, type status, collection number, locality data, collector, and collecting date.

Five new Brazilian species of the spider genus Attacobius Mello-Leitão, 1925 are described: A. demiguise n. sp. (based on male and female) and A. carimbo n. sp. (male), both from State of Pará; A. thalitae n. sp. (male) from the State of Minas Gerais; A. lauricae n. sp. (male) from State of Tocantins; and A. tremembe n. sp. (female) from State of Piauí. The males of A. luederwaldti (Mello-Leitão, 1923) and A. verhaaghi Bonaldo & Brescovit, 1998, and the females of A. uiriri Bonaldo & Brescovit, 2005 and A. blakei Bonaldo & Brescovit, 2005, are described for the first time. Additionally, new records of A. attarum (Roewer, 1935), A. carranca Bonaldo & Brescovit, 2005, A. kitae Bonaldo & Brescovit, 2005 and A. tucurui Bonaldo & Brescovit, 2005 are given.