Revalidation of Vareuotychia Forster, 1964, description of Vanima gen. nov., and notes on Euptychia cleophes Godman & Saivin, 1889 (Lepidoptera: Nymphalidae: Satyrinae)
ZOOTAXA
Authors: Zacca, Thamara; Casagrande, Mirna M.; Mielke, Olaf H. H.; Huertas, Blanca; Espeland, Marianne; Freitas, Andre V. L.; Willmott, Keith R.; Nakahara, Shinichi; Lamas, Gerardo
Abstract
Vareuptychia Forster, 1964 stat. rest. is revalidated and comprises two species, V. similis (Butler, 1867) comb. rest. and V themis (Butler, 1867) comb. nov. Vanima Zacca, Casagrande & Mielke gen. nov. is described to contain Euptychia labe Butler, 1870 (the type species), E. palladia Butler, 1867 and E. lesbia Staudinger, [1886]. The taxonomy of these two genera was initially revised based on morphological and distributional data, and subsequently tested and supported with a Maximum Likelihood analysis using four genes (COI, GAPDH. RpS5 and EF1-a). Lectoty pes are designated for Euptychia similis Butler. 1867, E themis Butler, 1867, E. undina Butler, 1870 and E. lesbia Staudinger, [1886]. No DNA sequences were obtained for Euptychia cleophes Godman & Salvin, 1889 but its transfer to Megisto Hubner, [1819] is supported by morphological evidence. For all taxa treated in this study, a taxonomic catalog, diagnosis, (re)description and illustrations of adults, venation and genitalia are provided, as well as comments on intraspecific variation, sexual dichromatism, ecology and distribution maps.
Whistler Mode Waves in the Compressional Boundary of Foreshock Transients
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Authors: Shi, Xiaofei; Liu, Terry Z.; Angelopoulos, Vassilis; Zhang, Xiao-Jia
Abstract
Earth's foreshock is filled with backstreaming particles that can generate a variety of waves and foreshock transients. According to recent studies, these particles can be further accelerated while being scattered by field fluctuations, including waves, inside foreshock transients, contributing to particle acceleration at the parent bow shock. The properties of these waves and how they interact with particles and affect particle acceleration inside foreshock transients are still unclear, however. Here we take the first step to study one important type of these waves, whistler waves. We use Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations and employ multiple case studies to investigate the properties of whistler waves in the compressional boundaries of foreshock transients where THEMIS wave burst mode is triggered. We show that the whistler waves are quasi parallel propagating with bidirectional Poynting vectors, suggesting that they are locally generated. We focus on how they interact with electrons. We show that the diffusion surfaces for these waves in the electron velocity space match the observed electron phase space density distribution contours better when the modeled pitch angle diffusion coefficients from these waves are higher. We also demonstrate that higher-energy electrons are more likely to be scattered by whistler waves. Our results suggest that whistler waves are important for scattering tens to hundreds of electronvolt electrons inside foreshock transients and elucidate electron dynamics and whistler wave properties in such environments.