Sula dwarf kingfisher

{{Short description|Species of bird}}

{{Speciesbox

| image = A monograph of the Alcedinidae (19838261011).jpg

| status = NT

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=BirdLife International |date=2016 |title=Ceyx wallacii |volume=2016 |page=e.T61659795A95175406 |doi=10.2305/IUCN.UK.2016-3.RLTS.T61659795A95175406.en |access-date=12 November 2021}}

| genus = Ceyx

| species = wallacii

| authority = Sharpe, 1868}}

The Sula dwarf kingfisher (Ceyx wallacii), is a species of bird in the family Alcedinidae that is endemic to the Sula Islands in Indonesia. Its natural habitat is subtropical or tropical moist lowland forests. It was formerly considered to be a subspecies of the variable dwarf kingfisher.

This species was formerly considered one of the 15 recognised subspecies of what was then known as the variable dwarf kingfisher (Ceyx lepidus or Alcedo lepidus).{{cite book | last1=Fry | first1=C. Hilary| last2=Fry | first2=Kathie| last3=Harris | first3=Alan | year=1992 | chapter=Variable Dwarf Kingfisher | title=Kingfishers, Bee-eaters, and Rollers| publisher=Christopher Helm | location=London | isbn=978-0-7136-8028-7 | pages=202–204 }} A molecular phylogenetic study published in 2013 found that most of the insular subspecies had substantially diverged from one another.{{cite journal | last1=Andersen | first1=M.J. | last2=Oliveros | first2=C.H. | last3=Filardi | first3=C.E. | last4=Moyle | first4=R.G. | year=2013 | title=Phylogeography of the Variable Dwarf-Kingfisher Ceyx lepidus (Aves: Alcedinidae) inferred from mitochondrial and nuclear DNA sequences | journal=Auk | volume=130 | issue=1 | pages=118–131 | doi=10.1525/auk.2012.12102 | hdl=1808/13331 | s2cid=55352878 | url=https://kuscholarworks.ku.edu/bitstream/1808/13331/1/Phylogeography%20of%20the%20Variable%20Dwarf-Kingfisher.pdf | hdl-access=free }} The variable dwarf kingfisher was therefore split and 12 of the subspecies, including the Sula dwarf kingfisher, were promoted to species status. At the same time the name of the variable dwarf kingfisher was changed to the Moluccan dwarf kingfisher.{{cite web| editor1-last=Gill | editor1-first=Frank | editor1-link=Frank Gill (ornithologist) | editor2-last=Donsker | editor2-first=David | year=2017 | title=Rollers, ground rollers & kingfishers | work=World Bird List Version 7.2 | url=http://www.worldbirdnames.org/bow/rollers/ | publisher=International Ornithologists' Union | access-date=17 May 2017 }}