M. grandis may refer to: Meconopsis grandis, the blue Poppy, a flowering plant found in Bhutan Melanella grandis, a very small ectoparasitic sea snail species in the genus Melanella Melanodexia grandis, a fly species in the genus Melanodexia Menegazzia grandis, a lichen species found in Australia Mexitlia grandis, a spider species in the genus Mexitlia found in Mexico Millettia grandis, a legume species found in South Africa Miohippus grandis, a prehistoric horse species found in now North America that lived from the late Eocene to early Miocene Moneta grandis, a spider species in the genus Moneta endemic to India Mullerornis grandis, an extinct elephant bird species found in Madagascar
Synonyms Makalata grandis, a synonym for Toromys grandis, the giant tree rat or white-faced tree rat, a spiny rat species found in Brazil
See also Grandis (disambiguation)