Halla Bergh, 1877 (Invalid: junior homonym of Halla Costa, 1844 [Annelida]; Hallaxa is a replacement name) Hallaxa is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod molluscs in the family Actinocyclidae.

Species in the genus Hallaxa include:[2][3][4][5]

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