Paula Beatriz Araujo

Universidade Federal do Rio Grande do Sul | UFRGS · Departamento de Zoologia

In this contribution, we describe two new species of burrowing crayfish species complex Parastacus brasiliensis from forestry areas in the central region of the state of Rio Grande do Sul, southern Brazil. We used an integrative taxonomy approach with morphology and the mitochondrial DNA 16S rRNA gene and also evaluated their conservation status ac...

This study deals with population structure and habitat sharing of two sympatric aeglid species, Aegla jarai Bond-Buckup and Buckup, 1994 and Aegla muelleri Bond-Buckup and Buckup, 2010 at Espingarda Creek, Serra do Itajaí National Park, Rio Itajaí-Açú basin, Santa Catarina, Brazil. Individuals of A. jarai (n = 190) and A. muelleri (n = 131) were ca...

Horizontal transmission between distantly related species has been used to explain how Wolbachia infect multiple species at astonishing rates despite the selection for resistance. Recently, a terrestrial isopod species was found to be infected by an unusual strain of supergroup F Wolbachia. However, only Wolbachia of supergroup B is typically found...

• This study aimed to determine biological and distributional aspects of deep‐sea giant isopods Bathynomus giganteus and Bathynomus miyarei to assess their extinction risk. • Bathynomus giganteus (663 specimens) and B. miyarei (649 specimens) were collected during five research cruises involving 265 h of sampling effort during 32 fishing operations...

Cymothoa ianuarii Schioedte & Meinert, 1884 is rediscovered almost 136 years after its original description and redescribed from specimens collected in the state of São Paulo. This species is mainly characterized by adult females with cephalon with conspicuous eyes and not deeply immersed in pereonite 1, pereonites 5-6 much wider than 4, pleotelson...

In this contribution, we describe a new species of burrowing crayfish of the genus Parastacus from a swamp forest in the state of Rio Grande do Sul, southern Brazil, and evaluate its conservation status according to the IUCN Red List Criteria (sub-criterion B1). Parastacus macanudo sp. nov. differs from all other congeneric species in that it has a...

Procambarus clarkii is a freshwater crayfish native to the southern central United States and northern Mexico. In Brazil, it is only present in natural environment in the state of São Paulo. Nutritional and reproductive markers were quantified and characterized, as well as intermediate metabolism and oxidative balance in females of P. clarkii colle...

Procambarus clarkii is an important invasive freshwater species whose ecological plasticity allows for its establishment in different kinds of environments; such plasticity is also reflected in its diet with two main consequences: invasion success and impact on native biota. In order to investigate P. clarkii’s feeding habits, examine how its diet...

This study describes and illustrates the morphology of the second juvenile stage of the blue-fingered burrowing crayfish Parastacus caeruleodactylus. One female carrying 20 juveniles was collected in January 2019 from a swamp forest in the municipality of Dom Pedro de Alcântara, state of Rio Grande do Sul, southern Brazil. Juveniles were dissected...

Egg incubation on the female abdomen is the parental care behavior observed in aeglids, in which eggs are kept adhered to maternal pleopods and maintained, cleaned and aerated. In A. platensis, egg attachment occurs with the aid of pleopodal setae, which are twisted around their axis in the distal region, forming the funiculus, and pleopodal glands...

Contesting scarce resources can trigger the evolution of specialized morphological structures (i.e., animal weapons). While most research focus on male weapons, females might also bear weapons, although generally smaller and less conspicuous than male weapons. Social selection is evoked to explain female weaponry in which females fight for nonsexua...

The deep sea remains the least known biome. Despite this fact, anthropic activities have affected these regions in various ways. The objective of this study was to outline the scientific production scenario based on deep sea research and to analyze trends present in the literature. For this, the bibliographical resources available from the Web of S...

Terrestrial isopods are one of the most diverse groups in the subterranean environment. To date, 39 oniscidean species are known from Brazilian caves; however, this number falls far short of the real diversity of the group, because even in the best studied areas new records are still frequent. During the last years many surveys in several caves fro...

Neognathophausia ingens (Dohrn, 1870) is a bathypelagic crustacean distributed worldwide. In the western Atlantic it has been recorded off the La Plata region, Argentina, and off the coast of Brazil, from the state of Bahia to Rio de Janeiro. We provide new records of N. ingens from the state of Rio Grande do Sul, Brazil, about 1188 km south of its...

Isopods consume feces in laboratory conditions. We investigated the effects of coprophagy on food consumption and assimilation and on isopod biomass to determine the best methodological design for feeding performance experiments. We used three species of isopods representing different eco-morphological groups and two leaves with different nitrogen...

Many monitoring studies use marking techniques to obtain dispersal data on individuals. Marking procedures may influence the vital activities of the terrestrial isopods, such as feeding behavior. The objective of this study was to identify the efficiency of different materials for external marking of woodlice and the influence on their feeding perf...

Wood CT, Nihei SS, Araujo PB (2018) Woodlice and their parasitoid flies: revision of Isopoda (Crustacea, Oniscidea) – Rhinophoridae (Insecta, Diptera) interaction and first record of a parasitized Neotropical woodlouse species. In: Hornung E, Taiti S, Szlavecz K (Eds) Isopods in a Changing World. ZooKeys 801: 401–414. https://doi.org/10.3897/zookey...

Rhinophoridae larva from a Neotropical woodlouse species

Compilation of Isopoda-Rhinophoridae records (Dataset)

The characterisation of intraspecific genetic diversity in representatives of the South American crayfish genus Parastacus Huxley, 1879 is here carried out for the first time by comparing populations of Parastacus brasiliensis (von Martens, 1869) as currently defined. Phylogenetic reconstructions based on mitochondrial and nuclear markers indicate...

The deep-sea crab Chaceon ramosae occurs at 350-1200 m depth in the southeast and south of Brazil. Here we evaluated the latitudinal, bathymetric, and seasonal abundance of C. ramosae in southern Brazil obtained during several research cruises. We also obtained populational data to evaluate the effectiveness of the fishing regulations for C. ramosa...

Terrestrial isopods are soil macroarthropods that have few known parasites and parasitoids. All known parasitoids are from the family Rhinophoridae (Insecta: Diptera). The present article reviews the known biology of Rhinophoridae flies and presents the first record of Rhinophoridae larvae on a Neotropical woodlouse species. We also compile and upd...

The use of molecular data in association with classical taxonomy has helped to alleviate the taxonomic impediment through the discovery, delimitation and description of new species. Terrestrial isopods are the largest suborder of Isopoda; however, there are very few active taxonomists in this group and a representative part of the terrestrial isopo...

Invasive species are one of the main threat to biodiversity. When an alien species is introduced into a new environment, fast identification and definition of management strategies may avoid or minimize impacts. When an invasive species is already established, the most adopted approaches are population control and monitoring. In order to perform su...

A new species of Pseudione Kossmann, 1881 is described from two parasitized specimens of the clawed lobster Nephropsis aculeata Smith, 1881, collected from Brazilian waters in the southwestern Atlantic. It is the second species of the genus from Brazil and is the fourth species parasitizing nephropid lobsters in the world.

Patterns of allocation between reproduction, survival and maintenance are what we call life history. By investigating the life history strategy of sympatric species, we may understand how they are able to coexist, as different strategies are expected to evolve in species that occupy similar niche space. Terrestrial isopods are a group in which mult...

Two new species of Parastacus Huxley, 1879 are described from the Atlantic Forest in southern Brazil: Parastacus buckupi sp. nov. from a highland stream in the hydrographic basin Maquiné river, Maquiné, state of Rio Grande do Sul; and Parastacus pilicarpus sp. nov. from a first order stream in the hydrographic basin Araranguá River, Morro Grande, s...

The Neotropical genus Brasiloniscus, erected by Lemos de Castro (1973), is revised and validated herein. The genus was originally described including two species, B. maculatus and B. verrucosus, but no type species was designated. According to § 13 of ICZN (1999) the name of the genus is therefore unavailable. Both species are redescribed, and B. m...

Although new methods and data are conquering space in the field of taxonomy, such as integrative taxonomy, most terrestrial isopod species are still described based only on morphology. Species of the genus Atlantoscia Ferrara and Taiti, 1981 were the first and are the unique terrestrial isopods from the Neotropics for which a molecular phylogeny wa...

Abstract Ludwig Buckup holds a Bachelor’s degree in Natural History in 1954 from the Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, and a Ph.D. in Zoology from the University of Tübingen, Germany, in 1958. He joined UFRGS as a Professor in 1958, from where he retired in 1990. During this period he was fully devoted to his career of...

The new species Cylindroniscus flaviae Campos-Filho, Araujo & Taiti is described from several caves in the Açungui karst area, Iporanga, state of São Paulo, Brazil. This discovery considerably enlarges the distribution of the genus, previously known from Cuba and Mexico. The genus Cylindroniscus is placed in the family Styloniscidae in consideratio...

Approximately 170 species of terrestrial isopods are known from Brazil, but only 12 are considered troglobionts. The family Pudeoniscidae comprises four species in two genera, Brasiloniscus and Pudeoniscus. After the examination of material collected in caves in the state of Bahia, a new genus and two new species have been recognized, Iansaoniscus...

The type specimen of Parastacus nicoleti (Philippi, 1882) was not designated and the material used for the description has never been found. We designate herein the neotype of P. nicoleti based on the examination of specimens from the type locality deposited in the Museo Nacional de Historia Natural of Chile previously analyzed by Bahamonde (1958),...

A large collection of terrestrial isopods from different Brazilian regions was examined. Two new species of Amazoniscus Lemos de Castro, 1967 (Scleropactidae) are described: A. zimmeri Campos-Filho, Montesanto & Araujo sp. nov. from the state of Pará and A. schmidti Campos-Filho, Montesanto & Taiti sp. nov. from the state of Minas Gerais. Pseudotyp...

The soil is a heterogeneous habitat with layers that differ in many aspects and soil animals' morphological adaptations relate to specific microhabitat. We compared cuticle surface structures and ultrastructure of Balloniscus glaber (endogeic) and Atlantoscia floridana (epigeic) using microscopy techniques to understand how morphological characteri...

Currently Neotroponiscus comprises eight species. In this study, two new species of this genus of terrestrial isopods are described. Neotroponiscus iporangaensis sp. nov. was collected in limestone caves located in Parque Estadual Turístico do Alto Ribeira (PETAR). Neotroponiscus tuberculatus sp. nov. occurs in iron ore caves of the Iron Quadrangle...

In this contribution we describe a new species of burrowing crayfish of the genus Parastacus Huxley, 1879 from a swamp forest in southern Brazil and determine its conservation status. The distinction of the new species is based on morphology and the mitochondrial DNA marker 16S rRNA. The extinction risk was assessed according to the sub-criterion B...

The question whether taxonomic descriptions naming new animal species without type specimen(s) deposited in collections should be accepted for publication by scientific journals and allowed by the Code has already been discussed in Zootaxa (Dubois & Nemésio 2007; Donegan 2008, 2009; Nemésio 2009a–b; Dubois 2009; Gentile & Snell 2009; Minelli 2009;...

This plot is not part of the published stance but derives from it. The plot shows the number of authors by geographic region (courtesy of Dr. Diego Astua).

Sabe-se que o estabelecimento de marcadores funcionais, em animais, frente às variações sazonais são importantes para a elucidação do processo de adaptação e invasão. A assim, o objetivo deste trabalho é avaliar as variações circanuais de parâmetros metabólicos e corporais do lagostim invasor Procambarus clarkii. Foram coletados 20 animais por cate...

The crayfish plague pathogen, Aphanomyces astaci, is a fungal-like organism (Oomycetes), specialized in parasitizing freshwater crayfish species. Crayfish plague is a disease that has caused losses of indigenous crayfish populations, especially in Europe. The pathogen chronically infects North American endemic crayfish, such as Procambarus clarkii,...

Two new species of Parastacus Huxley, 1879 are described from material collected in the state of Rio Grande do Sul, southern Brazil: Parastacus fluviatilis sp. nov. from highland streams and Parastacus caeruleodactylus sp. nov. from wetlands. Parastacus fluviatilis sp. nov. is distinguished mainly by large chelipeds with dense setae cover on the cu...

Before the present study, the genus Dubioniscus included four species occurring in Central and South Americas. The examination of Dubioniscus delamarei, D. marmoratus and D. negreae allowed us to revise the genus and to move D. goeldii to Calycuoniscus. Moreover, two new species are described, D. depressus n. sp. from the state of São Paulo, and D....

Biological invasions are a major cause of biodiversity loss, and early action in these cases is more cost-effective than dealing with widespread invasions. Thus, understanding possible consequences of invasions is essential for control and management actions. Given the early stage of invasion of South America by Procambarus clarkii, a potentially h...

Balloniscus glaber Araujo & Zardo, 1995 (Balloniscidae), um oniscídeo Neotropical, tem sido registrado historicamente em ambientes com baixa ou sem interferência humana. Em uma dessas áreas, a espécie foi classificada como K-estrategista. No entanto, recentemente foi registrada em uma floresta perturbada dentro dos limites urbanos. O presente traba...

The neotropical genus Benthana (Philosciidae) is reviewed. Fourteen species are redescribed: Benthana picta, B. olfersii, B. longicornis, B. schubarti, B. albomarginata, B. werneri, B. santosi, B. longipenis, B. bocainensis, B. moreirai, B. dimorpha, B. iporangensis, B. sulcata, and B. longicaudata. Additional characters were proposed for B. convex...

Identification to the species level using morphology is challenging when usual diagnostic characters are similar amongst related taxa. Within the Neotropical genus Atlantoscia, differences between nominal species are generally small and restricted to a few characters. Despite the power of DNA sequencing to identify and distinguish between species,...

Agonistic behavior can be either extremely variable or extremely conserved among species of the same genus. In general, species with similar morphologies and ecology tend to show similar agonistic behaviors. Understanding the variability of agonistic behavior is essential for elucidating the main drivers of the evolution of aggressive behavior. Aeg...

Identification to the species level using morphology is challenging when usual diagnostic characters are similar amongst related taxa. Within the Neotropical genus Atlantoscia, differences between nominal species are generally small and restricted to a few characters. Despite the power of DNA sequencing to identify and distinguish between species,...

Alien species have been transported and traded by humans for many centuries. However, with the era of globalization, biological invasions have reached notable magnitudes. Currently, introduction of alien species is one of the major threats to biodiversity and ecosystem functioning. Th North American crayfish Procambarus clarkii is one of the most w...

Despite Wolbachia being widespread among terrestrial isopods, studies on this symbiotic relationship are still incipient in the Neotropical region. The aims of the present study were to investigate the presence and prevalence of Wolbachia in natural populations of terrestrial isopod species in South America, and to analyze the diversity and phyloge...

This study reports new records of Procambarus clarkii Girard, 1852 in Southeastern Brazil and investigates its possible pathways of introduction. The Brazilian crayfish pet trade was surveyed with regard to species’ availability and price, reporting its persistence, even though illegal. An invasion risk analysis was performed by applying a protocol...

The activity of the litter-feeding macrofauna affects litter decomposition rates at the local scale, and their preference for particular litter types is mediated by litter traits. Environmental changes such as invasion by exotic plants may change the characteristics of the litter at a local scale, with consequences to ecosystem processes. Here we e...

To date, six species of terrestrial isopods were known from Brazilian caves, but only four could be classified as troglobites. This article deals with material of Oniscidea collected in many Brazilian karst caves in the states of Pará, Bahia, Minas Gerais, Mato Grosso do Sul, and São Paulo, and deposited in the collections of the Museu de Zoologia,...

Terrestrial isopods are important and dominant component of meso and macrodecomposer soil communities. The present study investigates the diversity and species composition of terrestrial isopods on three forests on the Serra Geral of the state of Rio Grande do Sul, Brazil. The area has two natural formations (Primary Woodland and Secondary Woodland...