Aculifera

Aculifera; Temporal range: Cambrian Stage 4–Recent PreꞒ Ꞓ O S D C P T J K Pg N
	A polyplacophoran (chiton)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Clade:	Aculifera ; Hatschek, 1891
Classes
	† Mattheviidae ; Polyplacophora ; Aplacophora ;

Last updated March 11, 2025

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.^[1] It is a sister group to the Conchifera. Monophyly of Aculifera is supported by fossil, anatomical and molecular studies.^[2]

The oldest known aculiferan is Qaleruaqia , which was found in the Aftenstjernesø Formation in Greenland, which dates back to the Cambrian Stage 4.^[3]

References

↑ Sigwart, J. D.; Sutton, M. D. (Oct 2007). "Deep molluscan phylogeny: synthesis of palaeontological and neontological data". Proceedings of the Royal Society B: Biological Sciences. 274 (1624): 2413–2419. doi:10.1098/rspb.2007.0701. PMC 2274978 . PMID 17652065. For a summary, see "The Mollusca". University of California Museum of Paleontology. Retrieved 2 October 2008.
↑ Chen, Zeyuan; Baeza, J. Antonio; Chen, Chong; Gonzalez, Maria Teresa; González, Vanessa Liz; et al. (2025). "A genome-based phylogeny for Mollusca is concordant with fossils and morphology". Science. 387 (6737): 1001–1007. doi: 10.1126/science.ads0215 . ISSN 0036-8075.
↑ John S. Peel (2020). "The oldest palaeoloricate mollusc (Cambrian Series 2, Stage 4; North Greenland) and its bearing on aculiferan evolution". Bulletin of Geosciences. 95 (2): 127–144. doi: 10.3140/bull.geosci.1779 .

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[Sigwart2007-1] Sigwart, J. D.; Sutton, M. D. (Oct 2007). "Deep molluscan phylogeny: synthesis of palaeontological and neontological data". Proceedings of the Royal Society B: Biological Sciences. 274 (1624): 2413–2419. doi:10.1098/rspb.2007.0701. PMC 2274978 . PMID 17652065. For a summary, see "The Mollusca". University of California Museum of Paleontology. Retrieved 2 October 2008.

[r630-2] Chen, Zeyuan; Baeza, J. Antonio; Chen, Chong; Gonzalez, Maria Teresa; González, Vanessa Liz; et al. (2025). "A genome-based phylogeny for Mollusca is concordant with fossils and morphology". Science. 387 (6737): 1001–1007. doi: 10.1126/science.ads0215 . ISSN 0036-8075.

[3] John S. Peel (2020). "The oldest palaeoloricate mollusc (Cambrian Series 2, Stage 4; North Greenland) and its bearing on aculiferan evolution". Bulletin of Geosciences. 95 (2): 127–144. doi: 10.3140/bull.geosci.1779 .

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