M. arenaria

M. arenaria may refer to:
 * Meloidogyne arenaria, a plant pathogenic nematode species
 * Mya arenaria, the soft-shell clam, steamer, softshell, longneck, piss clams or Ipswich clam, an edible saltwater clam species

Synonyms

 * Medicago arenaria, a synonym for Medicago littoralis, a plant species found primarily in the Mediterranean basin