Asymmetron
{{Short description|Genus of lacelets}}
{{Automatic taxobox
| fossil_range =
| image = (only) Asymmetron lucayanum.png
| image_caption = Asymmetron lucayanum
| taxon = Asymmetron
| authority = Andrews, 1893
| subdivision_ranks = Species
| subdivision = *Asymmetron inferum
}}
Asymmetron is one of the few living genera of lancelets (order Amphioxiformes). It is the type genus of family Branchiostomatidae.{{cite web |title=Asymmetron Andrews, 1893 |url=https://www.gbif.org/species/2473293 |website=www.gbif.org |access-date=10 June 2021 |language=en}}
Asymmetron can grow to 60 mm. The species of this genus are found in world oceans.
The genus Asymmetron currently contains only two species:{{Cite journal |last=Igawa, T. |first=M. Nozawa |last2=M. Nozawa |last3=D.G. Suzuki |last4=J.D. Reimer |last5=A.R. Morov |last6=Y. Wang |last7=Y. Henmi |last8=K. Yasui |year=2017 |title=Evolutionary history of the extant amphioxus lineage with shallow-branching diversification |journal=Scientific Reports |volume=7 |issue=1 |page=1157 |bibcode=2017NatSR...7.1157I |doi=10.1038/s41598-017-00786-5 |pmc=5430900 |pmid=28442709}}
- Asymmetron inferum {{small|Nishikawa, 2004}}
- Asymmetron lucayanum {{small|Andrews, 1893}}