M. gracilis may refer to: Machaeranthera gracilis, a flowering plant species Macroramphosus gracilis, the slender snipefish, a fish species Madia gracilis, the grassy tarweed and slender tarweed, a flowering plant species Maxillaria gracilis, the delicate maxillaria, an orchid species native to eastern and southern Brazil Melanotaenia gracilis, the slender rainbowfish, a fish species endemic to Australia Melanonus gracilis, the pelagic cod, a small deepwater fish species found in the Southern Ocean Meliphaga gracilis, the graceful honeyeater, a bird species Melomys gracilis, the black-tailed mosaic-tailed rat, a rodent species Micrathena gracilis, the spined micrathena, a spider species Microcephalophis gracilis, the graceful small-headed sea snake or slender sea snake, a snake species Microgale gracilis, the gracile shrew tenrec, a mammal species endemic to Madagascar Mylochromis gracilis, a fish species endemic to Malawi Myurella gracilis, Lindb., a sea snail species in the genus Myurella
See also Gracilis (disambiguation)