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  • Author: V. Carneiro x
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A New Species of Baccharomyia (Diptera, Cecidomyiidae) from Baccharis Pseudomiryocephala (Asteraceae) in Brazil

Baccharomyia magna Maia, sp. n., a gall midge (Lasiopteridi) that induces galls on Baccharis pseudomiryocephala (Asteraceae) is described and illustrated based on material from Minas Gerais, Brazil. A key to species is presented.


Auxetic materials are endowed with a behavior that contradicts common sense, when subjected to an axial tensile load they increase their transverse dimension. In case of a compression load, they reduce their transverse dimension. Consequently, these materials have a negative Poisson’s ratio in such direction. This paper reviews research related to these materials. It presents the theories that explain their deformation behavior and reveals the important role represented by the internal structure. Their mechanical properties are explored and some potential applications for these materials are shown.


Common bean diseased plants with symptoms of decline and root knots were collected in two growing areas in the municipality of Araucária, Paraná State (Brazil). Morphological (perineal patterns), biochemical (esterase phenotypes) and molecular (ITS1 sequences) studies allowed us to identify the infecting nematode as Meloidogyne luci. To our knowledge, this is the first formal record of M. luci parasitizing common bean in Paraná State, Brazil.