Maria Sibylla Merian (2 April 164713 January 1717) was a German entomologist, naturalist and scientific illustrator. She was one of the earliest European naturalists to observe insects directly. Merian was a descendant of the Frankfurt branch of the Swiss Merian family. Merian received her artistic training from her stepfather, Jacob Marrel, a student of the still life painter Georg Flegel. Merian published her first book of natural illustrations in 1675. She had started to collect insects as an adolescent. At age 13, she raised silkworms. In 1679, Merian published the first volume of a two-volume series on caterpillars; the second volume followed in 1683. Each volume contained 50 plates that she engraved and etched. Merian documented evidence on the process of metamorphosis and the plant hosts of 186 European insect species. Along with the illustrations Merian included descriptions of their life cycles. In 1699, Merian travelled to Dutch Guiana to study and record the tropical insects native to the region. In 1705, she published Metamorphosis Insectorum Surinamensium. Merian's Metamorphosis has been credited with influencing a range of naturalist illustrators. Because of her careful observations and documentation of the metamorphosis of the butterfly, Merian is considered by David Attenborough to be among the more significant contributors to the field of entomology. She discovered many new facts about insect life through her studies. Until her careful, detailed work, it had been thought that insects were "born of mud" by spontaneous generation. Life and career Maria Sibylla Merian's father, the Swiss engraver and publisher Matthäus Merian the Elder, married her mother, his second wife, Johanna Sybilla Heyne, in 1646. Maria was born within the next year, making her his ninth child. Her father died in 1650, and in 1651, her mother remarried Jacob Marrel, the flower and still life painter. Marrel encouraged Merian to draw and paint. While he lived mostly in Holland, his pupil Abraham Mignon trained her. At the age of 13, she painted her first images of insects and plants from specimens she had captured. Early on, she had access to many books about natural history. Regarding her youth, in the foreword to Metamorphosis Insectorum Surinamensium, Merian wrote: In May 1665, Merian married Marrel's apprentice, Johann Andreas Graff from Nuremberg; his father was a poet and director of the local high school, one of the leading schools in seventeenth-century Germany. In January 1668, she had her first child, Johanna Helena,