Uma nova espécie de Chaerilobuthus Lourenço & Beigel, 2011 do ambar Crétacico de Myanmar (Scorpiones: Chaerilobuthidae)

A new species of ChaerilobuthusLourenço & Beigel, 2011 from Cretaceous Burmeseamber (Scorpiones: Chaerilobuthidae

Tityus (Atreus) timendus Pocock, 1898 (Scorpiones, Buthidae), an enigmatic scorpion from Ecuador

Tityus (Atreus) timendus Pocock, 1898 (Scorpiones, Buthidae), an enigmatic scorpion from Ecuador </htm

Addition to the scorpion fauna of the Manaus region (Brazil), with a description of two new species of Tityus from the canopy

Two new species belonging to the genus Tityus C.L. KOCH are described from the region of Manaus, Amazonas State, Brazil. Until now a total of 9 scorpion species have been listed from this region, which is the best known region of Brazilian Amazonia. Both new species were collected from the forest canopy by means of insecticial fogging. Even though other scorpion species have previously been collected in the canopy, we suggest that the new species represent the first known examples of species living exclusively in this environment

Confirmação de reprodução por partenogênese em Hottentotta hottentotta (Fabricius) (Scorpiones, Buthidae)

Confirmation of reproduction by parthenogenesis in Hottentotta hottentotta (Fabricius) (Scorpiones, Buthidae)Confirmação de reprodução por partenogênese em Hottentotta hottentotta (Fabricius) (Scorpiones, Buthidae

Final state interaction in D+→K−π+π+D^+\to K^-\pi^+\pi^+ with KπK\pi I=1/2 and 3/2 channels

The final state interaction contribution to $D^+$ decays is computed for the $K^-\pi^+\pi^+$ channel within a light-front relativistic three-body model for the final state interaction. The rescattering process between the kaon and two pions in the decay channel is considered. The off-shell decay amplitude is a solution of a four-dimensional Bethe-Salpeter equation, which is decomposed in a Faddeev form. The projection onto the light-front of the coupled set of integral equations is performed via a quasi-potential approach. The S-wave $K\pi$ interaction is introduced in the resonant isospin $1/2$ and the non-resonant isospin $3/2$ channels. The numerical solution of the light-front tridimensional inhomogeneous integral equations for the Faddeev components of the decay amplitude is performed perturbatively. The loop-expansion converges fast, and the three-loop contribution can be neglected in respect to the two-loop results for the practical application. The dependence on the model parameters in respect to the input amplitude at the partonic level is exploited and the phase found in the experimental analysis, is fitted with an appropriate choice of the real weights of the isospin components of the partonic amplitude. The data suggests a small mixture of total isospin $5/2$ to the dominant $3/2$ one. The modulus of the unsymmetrized decay amplitude, which presents a deep valley and a following increase for $K\pi$ masses above $1.5$ GeV, is fairly reproduced. This suggests the assignment of the quantum numbers $0^+$ to the isospin 1/2 $K^*(1630)$ resonance

Synopsis of the scorpion fauna of the Manaus region, Amazonas State, Brazil, with description of two new species

A synopsis and a determination key are proposed for the scorpion fauna of the Manaus region in the State of Amazonas, Brazil. Tityus raquelae new species (Buthidae) and Brotheas amazonicus new species (Chactidae) are described. Some comments concerning the taxonomic position and the geographic distribution of the species are also included

Diversity of the scorpion fauna from Amazonia; centres of endemism; new support for the theory of Pleistocene forest refuges

It has long been accepted that Amazonia and the coastal Atlantic forest of Brazil were subject to long dry periods in the late Pleistocene and post-Pleistocene. These climatic changes reduced forest cover to limited areas, defined as forest-refuges. The previous evidence for this theory was based on studies of few groups of animals and plants (birds, lizards, insects, and woody plants). In this paper, new data are given to support the theory of Pleistocene forest refuges, using evidence from scorpion biogeography. Distribution patterns of Buthid and Chactid scorpions are analysed and discussed, and several centres of endemism are characterised in Amazonia and in the Atlantic forest. The refuges proposed here correspond closely to several of the refuge areas proposed by PRANCE and HAFFER, and to some of the areas proposed by BROWN Jr. & AB'SABER