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Wilson R. Lourenço - One of the best experts on this subject based on the ideXlab platform.
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Alessandro Ponce de Leão Giupponi
2016Co-Authors: Buthidae From, Wilson R. LourençoAbstract:Description of a new species of Tityus (Scorpiones, Buthidae) from the States of Espirito Santo and Rio de Janeiro, Brazil. Tityus potameis sp. n., a member of the Tityus bahiensis species group, is described on the basis of two male and six female specimens collected at several localities in both States. The geographic distribution of the new species ranges from ‘Macaé ’ in the State of Rio de Janeiro, to ‘Parque Duas Bocas ’ and ‘Reserva Biológica Santa Lúcia’, in the State of Espirito Santo. Comments on the taxonomic position of the new species and on aspects of the environmental characteristics of the Brazilian Atlantic Forest are also added
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Scorpions from the Mitaraka Massif in French Guiana. II. Description of a new species of Ananteris Thorell, 1891 (Scorpiones: Buthidae).
Comptes Rendus Biologies, 2016Co-Authors: Wilson R. LourençoAbstract:A new remarkable species belonging to the genus Ananteris Thorell, 1891 (Buthidae) is described from the Mitaraka Massif in French Guiana, a site located near the borders of French Guiana, Brazil, and Suriname. The description of this new species brings further evidence about the biogeographic patterns of distribution presented by most species of the genus Ananteris, which are highly endemic in most biogeographic realms of South America, including the Tepuys and Inselberg Massifs.
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New comments on the scorpions belonging to the 'Ananteris group' and description of a new genus and species from Ghana (Scorpiones: Buthidae)
2015Co-Authors: Andrea Rossi, Wilson R. LourençoAbstract:A new genus and species of buthid scorpion, associated with the 'Ananteris group' are described from the region of Tamale in Ghana. The new genus shows affinities with the genus Ananteroides Borelli, 1911 but can be clearly diagnosticated by a number of particular characters. This new scorpion taxon may represent an endemic element to the Western region of Africa. Riassunto. Nuovi commenti sugli scorpioni appartenenti al 'gruppo Ananteris' e descrizione di un nuovo genere e di una nuova specie dal Ghana (Scorpiones: Buthidae). Un nuovo genere ed una nuova specie di scorpione Buthidae, associati con il 'gruppo Ananteris', vengono descritti dalla regione di Tamale, in Ghana. Il nuovo genere mostra affinita con il genere Ananteroides Borelli, 1911, ma puo essere chiaramente diagnosticato da un certo numero di caratteri particolari. Questo nuovo taxon potrebbe rappresentare un elemento endemico della regione dell'Africa occidentale.
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A new species of the rare buthid scorpion genus Lissothus Vachon, 1948 from Central Algeria (Scorpiones, Buthidae).
Comptes Rendus Biologies, 2014Co-Authors: Wilson R. Lourenço, Salah Eddine SadineAbstract:Taxonomic considerations are given for the genus Lissothus Vachon, 1948 (Scorpiones, Buthidae). Two species are currently known, Lissothus bernardi Vachon, 1948 from Libya and Lissothus occidentalis Vachon, 1950 from Mauritania. In this contribution, a new species, Lissothus chaambi sp. n., is described from the desert of Central Algeria. The new species is most closely related to L. bernardi. The geographical distribution of the genus is discussed.
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The remarkable scorpion diversity in the Ecuadorian Andes and description of a new species of Tityus C. L. Koch, 1836 (Scorpiones, Buthidae)
ZooKeys, 2013Co-Authors: Wilson R. Lourenço, Eric YthierAbstract:A new species of Tityus, subgenus Atreus (Scorpiones: Buthidae) is described from the Province of Pichincha in the Ecuadorian Andes. Ecuadorian scorpion fauna remains one of the less well studied among those of South America. Nevertheless, some comments are addressed about its remarkable diversity and high level of endemic elements.
Eran Gefen - One of the best experts on this subject based on the ideXlab platform.
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the relative importance of respiratory water loss in scorpions is correlated with species habitat type and activity pattern
Physiological and Biochemical Zoology, 2011Co-Authors: Eran GefenAbstract:AbstractScorpions exhibit some of the lowest recorded water loss rates compared with those of other terrestrial arthropods of similar body size. Evaporative water loss (EWL) includes cuticular transpiration and respiratory water loss (RWL) from gas exchange surfaces, that is, book lung lamellae. Estimated fractions of cuticular and respiratory losses currently available from the literature show considerable variation, at least partly as a result of differences in methodology. This study reports RWL rates and their relative importance in scorpions from two families (Buthidae and Scorpionidae), including both xeric and mesic species (or subspecies). Two of the included Buthidae were surface-dwelling species, and another inhabits empty burrows of other terrestrial arthropods. This experimental design enabled correlating RWL importance with scorpion phylogeny, habitat type, and/or homing behavior. Buthidae species exhibited significantly lower EWL rates compared with those of Scorpionidae, whereas effects of ...
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Temperature dependence of water loss rates in scorpions and its effect on the distribution of Buthotus judaicus (Buthidae) in Israel.
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2006Co-Authors: Eran GefenAbstract:Scorpions of the family Buthidae have been shown to be more desiccation resistant in comparison with sympatric Scorpionidae species. This has been attributed to the surface-dwelling existence of the former, which unlike most other scorpion species do not avoid environmental extremes by burrowing. Still, within Buthidae, the mesic Buthotus judaicus showed better osmoregulatory capacities than the xeric Leiurus quinquestriatus, largely as a result of its high resistance to water loss. However, B. judaicus exhibited poor ability to regulate its haemolymph osmolarity at 37 °C. In this study we report a sharp increase in water loss rates of B. judaicus at the 30–35 °C temperature range compared to that measured for L. quinquestriatus, which could explain the poor osmoregulatory performance of the former at higher ambient temperatures. The increase in water loss rates of B. judaicus at high temperatures is not coupled with a similar increase in respiratory rate, suggesting an increase in cuticular permeability. We suggest that this increase in cuticular permeability, which may result from a relatively low critical transition temperature, contributes to limiting the distribution of B. judaicus to habitats of moderate environmental conditions.
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Comparative water relations of four species of scorpions in Israel: evidence for phylogenetic differences
The Journal of Experimental Biology, 2004Co-Authors: Eran Gefen, Amos ArAbstract:In an attempt to determine the nature of possible interspecific differences in osmotic responses to dehydration, the following species of two scorpion families were examined: Scorpio maurus fuscus (Scorpionidae) and Buthotus judaicus (Buthidae) from the mesic Lower Galilee (mean annual precipitation ∼525 mm); and Scorpio maurus palmatus (Scorpionidae) and Leiurus quinquestriatus (Buthidae) from the xeric Negev Desert (mean annual precipitation ∼100 mm). When sampled in the laboratory following their capture , B. judaicus (548±38 mOsm l–1; mean ± s.d.) and L. quinquestriatus (571±39 mOsm l–1) had higher and less variable haemolymph osmolarities than the scorpionids occupying the same habitats (511±56 and 493±53 mOsm l–1 for S. m. fuscus and S. m. palmatus , respectively). In response to 10% mass loss when desiccated at 30°C, the haemolymph osmolarity of the two buthids increased by 5–9%, compared to ca. 23% in the two scorpionids. Buthids had lower water loss rates than scorpionids. The similar oxygen consumption rates, when converted to metabolic water production, imply a higher relative contribution of metabolic water to the overall water budget of buthids. This could explain why the osmoregulative capabilities exhibited by buthids are better than those of scorpionids. We conclude that the observed interspecific differences in water and solute budgets are primarily phylogenetically derived, rather than an adaptation of the scorpions to environmental conditions in their natural habitat.
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Comparative water relations of four species of scorpions in Israel: evidence for phylogenetic differences.
The Journal of experimental biology, 2004Co-Authors: Eran Gefen, Amos ArAbstract:In an attempt to determine the nature of possible interspecific differences in osmotic responses to dehydration, the following species of two scorpion families were examined: Scorpio maurus fuscus (Scorpionidae) and Buthotus judaicus (Buthidae) from the mesic Lower Galilee (mean annual precipitation approximately 525 mm); and Scorpio maurus palmatus (Scorpionidae) and Leiurus quinquestriatus (Buthidae) from the xeric Negev Desert (mean annual precipitation approximately 100 mm). When sampled in the laboratory following their capture, B. judaicus (548+/-38 mOsm l(-1); mean +/- S.D.) and L. quinquestriatus (571+/-39 mOsm l(-1)) had higher and less variable haemolymph osmolarities than the scorpionids occupying the same habitats (511+/-56 and 493+/-53 mOsm l(-1) for S. m. fuscus and S. m. palmatus, respectively). In response to 10% mass loss when desiccated at 30 degrees C, the haemolymph osmolarity of the two buthids increased by 5-9%, compared to ca. 23% in the two scorpionids. Buthids had lower water loss rates than scorpionids. The similar oxygen consumption rates, when converted to metabolic water production, imply a higher relative contribution of metabolic water to the overall water budget of buthids. This could explain why the osmoregulative capabilities exhibited by buthids are better than those of scorpionids. We conclude that the observed interspecific differences in water and solute budgets are primarily phylogenetically derived, rather than an adaptation of the scorpions to environmental conditions in their natural habitat.
Bastawade Deshabhushan - One of the best experts on this subject based on the ideXlab platform.
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A new species of \u3cem\u3eIsometrus\u3c/em\u3e (Scorpiones: Buthidae) from southern India
Marshall Digital Scholar, 2020Co-Authors: Sulakhe Shauri, Dandekar Nikhil, Mukherjee Shomen, Pandey Malay, Ketkar Makarand, Padhye Anand, Bastawade DeshabhushanAbstract:A new species of Isometrus (Buthidae) is described from India using integrated taxonomic approach. Isometrus kovariki sp. n. is closely related to I. thurstoni, and differs in morphological features and raw genetic divergence of more than 9%
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Two new cryptic species of \u3cem\u3eIsometrus\u3c/em\u3e (Scorpiones: Buthidae) from the northern Western Ghats, India
Marshall Digital Scholar, 2020Co-Authors: Sulakhe Shauri, Dandekar Nikhil, Padhye Anand, Bastawade DeshabhushanAbstract:Integrated taxonomic approach is used to describe two new cryptic species of the genus Isometrus Ehrenberg, 1828 (Scorpiones: Buthidae) from the northern Western Ghats of India. Isometrus tamhini sp. n. and I. amboli sp. n. are closely related to each other and differ from two other Indian species of the genus, I. thurstoni and I. maculatus, by the morphological features and a raw genetic divergence of over 10%
Adriano M C Pimenta - One of the best experts on this subject based on the ideXlab platform.
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Moving pieces in a taxonomic puzzle: venom 2D-LC/MS and data clustering analyses to infer phylogenetic relationships in some scorpions from the Buthidae family (Scorpiones).
Toxicon, 2006Co-Authors: Danielle G Nascimento, Marie-france Martin-eauclaire, Breno Rates, Daniel M Santos, Thiago Verano-braga, Adriano Barbosa-silva, Alexandre A A Dutra, Ilka Biondi, Maria Elena De Lima, Adriano M C PimentaAbstract:The Buthidae is the most clinically important scorpion family, with over 500 species distributed worldwide. Taxonomical positions and phylogenetic relationships concerning the representative genera and species of this family have been mostly inferred based upon comparisons between morphological characters. Yet, some authors have performed such inferences by comparing some structural properties of a few selected molecules found in the venoms from these scorpions. Here, we propose a novel methodology pipeline designed to address these issues. We have analyzed the whole venoms from some species that exemplify peculiar cases in the Buthidae family (Tityus stigmurus, Tityus serrulatus, Tityus bahiensis, Leiurus quinquestriatus quinquestriatus and Leiurus quinquestriatus hebraeus), by means of a proteomic approach using a 2D-LC/MS technique. The molecules found in these venoms were clustered according to their physicochemical properties (molecular mass and hydrophobicity), by using the machine learning-based Weka software. The clusters assessment, along with the number of molecules found in a given cluster for each scorpion, which assigns for the venom and structural family complexities, respectively, was used to generate a phenetic correlation tree for positioning these species. Our results were in accordance with the classical taxonomy viewpoint, which places T. serrulatus and T. stigmurus as very close species, T. bahiensis as a less related species in the Tityus genus and L. q. quinquestriatus and L. q. hebraeus with small differences within the same species (L. quinquestriatus). Therefore, we believe that this is a well-suited method to determine venom complexities that reflect the scorpions' evolutionary history, which can be crucial to reconstruct their phylogeny through the molecular evolution of their venoms.
Camilo I. Mattoni - One of the best experts on this subject based on the ideXlab platform.
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Dated phylogenetic studies of the southernmost American buthids (Scorpiones; Buthidae).
Molecular Phylogenetics and Evolution, 2017Co-Authors: Andrés A. Ojanguren-affilastro, Renzo Sebastián Adilardi, Camilo I. Mattoni, Martín J. Ramírez, F. Sara CeccarelliAbstract:A dated molecular phylogeny of the southernmost American species of the family Buthidae, based on two nuclear and two mitochondrial genes, is presented. Based on this study, analyzed species of the subgenus Tityus (Archaeotityus) are neither sister to the remaining species of the genus Tityus, nor are they closely related to the New World microbuthids with decreasing neobothriotaxy. Analyzed species of the subgenus Tityus do not form a monophyletic group. Based on ancestral area estimation analyses, known geoclimatic events of the region and comparisons to the diversification processes of other epigean groups from the area, a generalized hypothesis about the patterns of historical colonization processes of the family Buthidae in southern South America is presented. Furthermore, for the first time, a Paleogene-African ingression route for the colonization of America by the family Buthidae is proposed as a plausible hypothesis.
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comparative anatomy of the mesosomal organs of scorpions chelicerata scorpiones with implications for the phylogeny of the order
Zoological Journal of the Linnean Society, 2008Co-Authors: Camilo I. Mattoni, Erich S Volschenk, Lorenzo PrendiniAbstract:We present a review and reassessment of anatomical variation in the ovariuterus (and associated follicles), digestive gland, and lateral lymphoid organs of scorpions, and discuss the contribution of these character systems to the understanding of scorpion phylogeny. New data, obtained using light microscopy, are presented from an examination of 55 scorpion species, representing most scorpion families, and are collated with observations from the literature. Six distinct types of ovariuterine anatomy are identified: five in the family Buthidae and one in the remaining (nonbuthid) families. The buthid genera Lychas C.L. Koch, 1845 and Rhopalurus Thorell, 1876 are exceptional in possessing multiple types of ovariuterine anatomy among the congeneric species studied. The presence or absence of lateral lymphoid organs appears to be phylogenetically informative: the organ is absent in buthids, chaerilids and Pseudochactas Gromov, 1998. Embryo follicle morphology appears to be phylogenetically informative within the superfamily Scorpionoidea Latreille, 1802, where it supports the controversial sister-group relationship between Urodacus Peters, 1861 and Heteroscorpion Birula, 1903. The mesosomal anatomy of Microcharmus Lourenco, 1995 (Microcharmidae Lourenco, 1996) is consistent with that of Buthidae C.L. Koch, 1837, and we therefore propose the following new synonymy: Microcharmidae Lourenco, 1996 = Buthidae C.L. Koch, 1837. © 2008 The Linnean Society of London, Zoological Journal of the Linnean Society, 2008, 154, 651–675.
