Aculifera

{{Automatic taxobox

| fossil_range = {{fossilrange|Cambrian Stage 4|Recent}}

| image = Tonicella-lineata.jpg

| image_caption = A polyplacophoran (chiton)

| taxon = Aculifera

| authority = Hatschek, 1891

| subdivision_ranks = Classes

| subdivision =

}}

Aculifera (older name: Amphineura) is a clade of molluscs incorporating those groups that have no conch or shell, that is, the Polyplacophora, Caudofoveata and Solenogastres.{{Cite journal| last1 = Sigwart | first1 = J. D.| last2 = Sutton | first2= M. D.| title = Deep molluscan phylogeny: synthesis of palaeontological and neontological data| journal = Proceedings of the Royal Society B: Biological Sciences| issue = 1624| volume = 274| pages = 2413–2419| date =Oct 2007| pmid = 17652065| pmc = 2274978| doi = 10.1098/rspb.2007.0701}} For a summary, see {{cite web| title=The Mollusca | publisher=University of California Museum of Paleontology| url=http://www.ucmp.berkeley.edu/taxa/inverts/mollusca/mollusca.php| accessdate=2 October 2008}} It is a sister group to the Conchifera. Monophyly of Aculifera is supported by fossil, anatomical and molecular studies.{{cite journal | last=Chen | first=Zeyuan | last2=Baeza | first2=J. Antonio | last3=Chen | first3=Chong | last4=Gonzalez | first4=Maria Teresa | last5=González | first5=Vanessa Liz | last6=Greve | first6=Carola | last7=Kocot | first7=Kevin M. | last8=Arbizu | first8=Pedro Martinez | last9=Moles | first9=Juan | last10=Schell | first10=Tilman | last11=Schwabe | first11=Enrico | last12=Sun | first12=Jin | last13=Wong | first13=Nur Leena W. S. | last14=Yap-Chiongco | first14=Meghan | last15=Sigwart | first15=Julia D. | title=A genome-based phylogeny for Mollusca is concordant with fossils and morphology | journal=Science | display-authors=5 | volume=387 | issue=6737 | date=2025 | issn=0036-8075 | doi=10.1126/science.ads0215 | doi-access=free | pages=1001–1007}}

The oldest known aculiferan is Qaleruaqia, which was found in the Aftenstjernesø Formation in Greenland, which dates back to the Cambrian Stage 4.{{Cite journal|author=John S. Peel |year=2020 |title=The oldest palaeoloricate mollusc (Cambrian Series 2, Stage 4; North Greenland) and its bearing on aculiferan evolution |journal=Bulletin of Geosciences |volume=95 |issue=2 |pages=127–144 |doi=10.3140/bull.geosci.1779 |doi-access=free }}

References

Category:Mollusc taxonomy