Maria Sibylla Merian
Maria Sibylla Merian (2 April 164713 January 1717) was a German-born naturalist and scientific illustrator, a descendant of the Frankfurt branch of the Swiss Merian family. Merian was one of the first naturalists to observe insects directly.
Maria Martin
Maria Martin Bachman (3 July 1796 – 27 December 1863) of Charleston, South Carolina, USA, was a watercolor painter and scientific illustrator. She contributed many of the background paintings for John James Audubon's "The Birds of America" (1831–39) and "Viviparous Quadrupeds of North America" (1845–48).