In Greek mythology, Myrtoessa () was an Arcadian nymph. Along with other nymphs – Neda, Anthracia, Hagno and Anchirhoe – she was a nurse of the god Zeus. On a table in a sanctuary of Demeter and Persephone at Megalopolis, she and Anchirhoe were depicted as carrying water-pots.Pausanias, 8.31.4 A non-marine mollusc called Myrtoessa hyas, in the Hydrobiidae (mud snail) family, is named after the nymph.
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References Pausanias, Description of Greece with an English Translation by W.H.S. Jones, Litt.D., and H.A. Ormerod, M.A., in 4 Volumes. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1918. . Online version at the Perseus Digital Library.