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Prodryas Persephone
''Prodryas persephone'' is an extinct species of brush-footed butterfly, known from a single specimen from the Chadronian-aged Florissant Shale Lagerstatte of Late Eocene Colorado. ''P. persephone'' is the first fossil butterfly to be found in North America, and is exquisitely well preserved. Its closest extant relatives are the mapwings and African admirals of the genera ''Hypanartia'' and ''Antanartia'', respectively. Significance The type specimen, now held at the Museum of Comparative Zoology of Harvard University, was the first fossil butterfly to be found in North America, and has been described as "possibly the best fossil butterfly specimen ever found". The appearance of a figure of ''Prodryas'' in Samuel Hubbard Scudder's book ''Frail Children of the Air'' influenced the paleontologist Frank M. Carpenter to embark on his career. Scudder exhibited the specimen at the Royal Entomological Society of London in December 1893. Description The single known specimen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engraving
Engraving is the practice of incising a design onto a hard, usually flat surface by cutting grooves into it with a Burin (engraving), burin. The result may be a decorated object in itself, as when silver, gold, steel, or Glass engraving, glass are engraved, or may provide an Intaglio (printmaking), intaglio printing plate, of copper or another metal, for printing images on paper as prints or illustrations; these images are also called "engravings". Engraving is one of the oldest and most important techniques in printmaking. Wood engraving is a form of relief printing and is not covered in this article, same with rock engravings like petroglyphs. Engraving was a historically important method of producing images on paper in artistic printmaking, in mapmaking, and also for commercial reproductions and illustrations for books and magazines. It has long been replaced by various photographic processes in its commercial applications and, partly because of the difficulty of learning th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
