Aculifera is a proposed
clade of molluscs incorporating those groups that have no conch or shell, that is, the
Polyplacophora,
Caudofoveata
Caudofoveata is a small class within the phylum Mollusca, also known as Chaetodermomorpha. The class is often combined with Solenogastres and termed Aplacophora, but some studies have cast doubt on the monophyly of this group.
Anatomy
Caudofo ...
(=
Chaetodermomorpha) and
Solenogastres
The Solenogastres (less often referred to as Neomeniomorpha), common name the solenogasters, are one class of small, worm-like, shell-less molluscs (Aplacophora), the other class being the Caudofoveata ( Chaetodermomorpha). MolluscaBase eds. (20 ...
(=
Neomeniomorpha).
[ For a summary, see ]
It is sister to the
Conchifera.
The oldest known aculiferan is ''
Qaleruaqia'', which was found in the
Aftenstjernesø Formation in
Greenland
Greenland ( kl, Kalaallit Nunaat, ; da, Grønland, ) is an island country in North America that is part of the Kingdom of Denmark. It is located between the Arctic and Atlantic oceans, east of the Canadian Arctic Archipelago. Greenland i ...
, which dates back to the
Cambrian Stage 4.
References
Mollusc taxonomy
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