Brania pusilla

{{Short description|Species of worm}}

{{Speciesbox

| taxon = Brania pusilla

| authority = (Dujardin, 1851)

| synonyms = {{specieslist

| Exogone pusilla |Dujardin, 1851

| Grubea pusilla |(Dujardin, 1851)

| Grubeosyllis pusilla |(Dujardin, 1851)

| Sphaerosyllis pusilla |(Dujardin, 1851)

}}

}}

Brania pusilla is a species of marine annelid in the family Syllidae.{{Cite web|title=Brania pusilla (Dujardin 1851) - Encyclopedia of Life|url=https://eol.org/pages/406894|access-date=2021-10-04|website=eol.org}} The original name for the species was Exogone pusilla.

The species has a cosmopolitan distribution.{{Cite web|title=WoRMS - World Register of Marine Species - Brania pusilla (Dujardin, 1851)|url=http://www.marinespecies.org/aphia.php?p=taxdetails&id=146738|access-date=2021-10-09|website=www.marinespecies.org|language=en}}

The body can be 1 mm to 2.5 mm long with 28 to 35 segments.{{Cite book|last1=Hayward|first1=P. J.|url=https://books.google.com/books?id=sZ8mdRT4jbIC&dq=Brania+pusilla&pg=PA235|title=Handbook of the Marine Fauna of North-West Europe|last2=Ryland|first2=J. S.|date=1995-06-29|publisher=OUP Oxford|isbn=978-0-19-854055-7|pages=235–236|language=en}} It is suggested that parthenogenesis is a normal condition in this species.{{Cite book|last1=Dorresteijn|first1=Adriaan W. C.|url=https://books.google.com/books?id=7DbyCAAAQBAJ&dq=Brania+pusilla&pg=PA41|title=Reproductive Strategies and Developmental Patterns in Annelids|last2=Westheide|first2=Wilfried|date=2013-04-18|publisher=Springer Science & Business Media|isbn=978-94-017-2887-4|pages=46–47|language=en}} According to the Encyclopedia of Life the species is simultaneous hermaphroditic.