M. japonica

M. japonica may refer to:
 * Mahonia japonica, a medium-sized shrub species native to northeastern China
 * Majewskia japonica, a fungus species
 * Mauremys japonica, the Japanese pond turtle, a turtle species endemic to Japan
 * Melibe japonica, a sea slug species
 * Meloimorpha japonica, the suzumushi or bell cricket, an insect species
 * Monocentris japonica, a pinecone fish species found in the tropical Indo-West Pacific oceans
 * Morula japonica, a sea snail species
 * Muscina japonica, a fly species in the genus Muscina
 * Myrmarachne japonica, a jumping spider species in the genus Myrmarachne found in Russia, China, Korea, Taiwan and Japan

Synonyms

 * Melia japonica, a synonym for Melia azedarach, the Persian lilac, white cedar, chinaberry, bead tree, lunumidella, Ceylon cedar and malai vembu, a deciduous tree species native to India, southern China and Australia
 * Meristotheca japonica, a synonym for Meristotheca papulosa, the jiguancai or tosaka-nori, a red alga species popular as a sea vegetable in Taiwan and in Japan
 * Moroteuthis japonica, a synonym for Moroteuthis robusta, the robust clubhook squid, a squid species