Synxenidae

{{Short description|Family of millipedes}}

{{Automatic taxobox

| fossil_range = {{fossilrange|Cenomanian|Present}}

| image = Phryssonotus brevicapensis.jpg

| image_caption = Phryssonotus brevicapensis

| parent_authority = Silvestri, 1923

| taxon = Synxenidae

| authority = Silvestri, 1923

| subdivision_ranks = Genera

| subdivision = *Condexenus

• Phryssonotus
• Schindalmonotus

}}

Synxenidae is a family of bristle millipedes (Polyxenida). Three genera and around 10 species are known. Adult synxenids possess 15 or 17 pairs of legs, with the last two pair modified for small jumps.{{cite journal|title=Classification actuelle des diplopodes pénicillates (myriapodes) avec nouvelles définitions des taxa|first1=Bruno|last1=Condé|first2=Monique|last2=Nguyen Duy-Jacquemin|journal=Bulletin de la Société zoologique de France|year=2008|volume=133|number=4|pages=291–302|url=http://www.snv.jussieu.fr/zoologie/Bulletin/Documents/BulletinSZF2008/01_Conde.pdf}} Adults in most species in this family have 17 pairs of legs, but in two species (Condexenus biramipalpus and Phryssonotus brevicapensis), they have only 15 pairs of legs.{{Cite journal|last=Enghoff|first=Henrik|last2=Golovatch|first2=Sergei|last3=Short|first3=Megan|last4=Stoev|first4=Pavel|last5=Wesener|first5=Thomas|date=2015-01-01|title=Diplopoda — taxonomic overview|url=https://brill.com/view/book/edcoll/9789004188273/B9789004188273_017.xml|journal=Treatise on Zoology - Anatomy, Taxonomy, Biology. The Myriapoda, Volume 2|language=en|pages=363–453|doi=10.1163/9789004188273_017|url-access=subscription}}{{cite journal |last1=Nguyen Duy-Jacquemin |first1=Monique |last2=Uys |first2=Charmaine |last3=Geoffroy |first3=Jean-Jacques |date=2011 |title=Two remarkable new species of Penicillata (Diplopoda, Polyxenida) from Table Mountain National Park (Cape Town, South Africa) |journal=ZooKeys |issue=156 |pages=85–103 |doi=10.3897/zookeys.156.2211 |pmc=3253573 |pmid=22303097 |doi-access=free}}