{{Short description|Genus of gastropods}} {{Use dmy dates|date=February 2025}} {{Automatic taxobox | fossil_range = | image = Onchidina australis 001.jpg | image_caption = ''Onchidina australis'' | taxon = Onchidina | authority = Semper, 1885 | synonyms_ref = <ref name="WoRMS"/> | synonyms = * ''Oncidina'' <small>Plate, 1893 </small> * ''Paraoncidium'' <small>Labbé, 1934</small> unavailable name (no type species designated) * ''Paraoncidium'' <small>Starobogatov, 1976</small> }}
'''''Onchidina''''' is a monotypic genus of air-breathing sea slugs, a shell-less marine pulmonate gastropod mollusks in the family Onchidiidae.<ref name="WoRMS">{{WRMS species|424002|''Onchidina'' Semper, 1885||16 April 2010}}</ref>
Its sole member is the species '''''Onchidina australis'''.''<ref name="WoRMS2">{{WRMS species|446179|''Onchidina australis'' J.E. Gray in Semper, 1885||30 September 2010}}</ref> Uniquely within the Onchidiidae, ''O. australis'' lives above the tidal zone in a fully terrestrial habitat.<ref>{{Cite journal|last1=Dayrat|first1=Benoît|last2=Goulding|first2=Tricia C.|date=2017-06-29|title=Systematics of the onchidiid slug Onchidina australis (Mollusca: Gastropoda: Pulmonata)|url=https://www.schweizerbart.de/papers/archmoll/detail/146/87641/Systematics_of_the_onchidiid_slug_Onchidina_austra?af=crossref|journal=Archiv für Molluskenkunde: International Journal of Malacology|volume=146 |language=en|pages=121–133|doi=10.1127/arch.moll/146/121-133|url-access=subscription}}</ref>
==Description== (Original description of ''Onchidina australis'') The dorsal surface of the mollusk is strongly convex, while the ventral surface is flat. The dorsal mantle surface exhibits strong, irregular granulation, lacking any evidence of pseudobranchiae. Larger tubercles are distributed irregularly, spaced approximately 3-4 mm apart. The dorsal coloration is yellowish-gray, interspersed with darker speckles and dots. Two more or less indistinct bands of spots traverse the dorsal surface longitudinally, maintaining a consistent distance from each other and from the mantle margin. The larger tubercles on the dorsal surface are whitish. The ventral surfaces of the foot and head display a yellowish or reddish-gray coloration. The ventral surface of the mantle is blue-gray, bordered by a narrow yellowish band.<ref>{{cite book |last1=Semper |first1=C. |title=Reisen im Archipel der Philippinen, Theil 2. Wissenschaftliche Resultate Band 3, Landmollusken. |date=1870–1885 |publisher=Kreidel |location=Wiesbaden |page=287 |url=https://biodiversitylibrary.org/page/32630046 |access-date=12 February 2025}} {{source-attribution}}</ref>
==Distribution== This species is endemic to Australia and occurs off Queensland.
==References== {{Reflist}}
{{Taxonbar|from1=Q7091984|from2=Q3143108}}
Category:Onchidiidae Category:Monotypic gastropod genera Category: Gastropods of Australia Category:Gastropods described in 1880