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The genus    Peronia    Fleming, 1822 includes all the onchidiid slugs with dorsal gills. Its taxonomy is revised for the first time based on a large collection of fresh material from the entire Indo-West Pacific, from South Africa to Hawaii. Nine species are supported by mitochondrial ( COI  and 16S) and nuclear (ITS2 and 28S) sequences as well as comparative anatomy. All types available were examined and the nomenclatural status of each existing name in the genus is addressed. Of 31    Peronia    species-group names available, 27 are regarded as invalid (twenty-one synonyms, sixteen of which are new, five  nomina dubia , and one homonym), and four as valid:    Peronia   peronii    (Cuvier, 1804),    Peronia   verruculata    (Cuvier, 1830),    Peronia   platei    (Hoffmann, 1928), and    Peronia   madagascariensis    (Labbé, 1934a). Five new species names are created:    P.   griffithsi    Dayrat &amp; Goulding,  sp. nov. ,    P.   okinawensis    Dayrat &amp; Goulding,  sp. nov. ,    P.   setoensis    Dayrat &amp; Goulding,  sp. nov. ,    P.   sydneyensis    Dayrat &amp; Goulding,  sp. nov. , and    P.   willani    Dayrat &amp; Goulding,  sp. nov.    Peronia    species are cryptic externally but can be distinguished using internal characters, with the exception of    P.   platei    and    P.   setoensis   . The anatomy of most species is described in detail here for the first time. All the secondary literature is commented on and historical specimens from museum collections were also examined to better establish species distributions. The genus    Peronia    includes two species that are widespread across the Indo-West Pacific (   P.   verruculata    and    P.   peronii   ) as well as endemic species:    P.   okinawensis    and    P.   setoensis    are endemic to Japan, and    P.   willani    is endemic to Northern Territory, Australia. Many new geographical records are provided, as well as a key to the species using morphological traits.

Systematic revision of the genus Peronia Fleming, 1822 ( Gastropoda , Euthyneura , Pulmonata , Onchidiidae )