Aculifera
Sign in to saveAculifera (older name: Amphineura) is a clade of molluscs incorporating those groups that have no conch or shell, that is, the Polyplacophora, Caudofoveata and Solenogastres. It is a sister group to the Conchifera. Monophyly of Aculifera is supported by fossil, anatomical and molecular studies.
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Subphylum
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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. It is a sister group to the Conchifera. Monophyly of Aculifera is supported by fossil, anatomical and molecular studies.
The oldest known aculiferan is Qaleruaqia, which was found in the Aftenstjernesø Formation in Greenland, which dates back to the Cambrian Stage 4.
Excerpted from Wikipedia’s “Aculifera” article, available under the CC BY-SA 4.0 licence.