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Morphological and molecular data are presented for the first time in an integrative way for the genus    Myja    Bergh, 1896. In accordance with the new molecular phylogenies, the traditional   Facelinidae   is paraphyletic. Herein is presented the phylogenetic placement of true   Facelinidae   s. str., including the first molecular data for    F.   auriculata    (Müller, 1776), type species of the genus    Facelina    Alder &amp; Hancock, 1855. The taxonomic history of    F.   auriculata    is reviewed. The genus    Myja    is related to the clade   Facelinidae   s. str., but shows disparate morphological traits. Two new species of the genus    Myja   ,    M.   karin    sp. n. , and    M.   hyotan    sp. n. , are described from the Pacific waters of Japan (middle Honshu), and   M.   cf.   longicornis   Bergh, 1896 is investigated from Thailand. According to molecular analysis and review of available morphological information, the genus    Myja    contains more hidden diversity. The family-level relationship within aeolidacean nudibranchs with emphasis on the family   Facelinidae   is outlined. The problem of the relationship between   Facelinidae   Bergh, 1889 and   Glaucidae   Gray, 1827 is discussed. The family   Glaucidae   has precedence over   Facelinidae   and is phylogenetically related to the core group of   Facelinidae   s. str., but has a profoundly modified aberrant external morphology, thus making a purely molecular-based approach to the taxonomy an unsatisfactory solution. To accommodate recently discovered hidden diversity within glaucids, the genus    Glaucilla    Bergh, 1861 is restored. The family   Facelinidae   s. str. is separate from, and not closely related to, a clade containing the genera    Dondice    Marcus, 1958,    Godiva    MacNae 1954,    Hermissenda    Bergh, 1879, and    Phyllodesmium    Ehrenberg, 1831 (=    Myrrhine    Bergh, 1905). The oldest valid available name for the separate ex-facelinid paraphyletic clade that contains several facelinid genera is   Myrrhinidae   Bergh, 1905, and resurrection of this family name under provision of the ICZN article 40.1 can preliminarily solve the problem of paraphyly of the traditional   Facelinidae  . “  Facelinidae  ” s. l. needs to be further divided into several separate families, pending further study.

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The extraordinary genus    Myja    is not a tergipedid, but related to the   Facelinidae   s. str. with the addition of two new species from Japan (  Mollusca  ,   Nudibranchia  )