The aplacophorans are traditionally considered ancestral to the other mollusc classes.
2.
The affinities of Aplacophorans have long been uncertain.
3.
Molecular and fossil evidence seemed to put Aplacophorans in the clade Aculifera, as a sister group to Polyplacophora.
4.
However, the relationship between the two aplacophoran groups and to the other molluscan classes and to each other is as yet unclear.
5.
Aplacophorans are cylindrical and worm-like in form, and most very small, being no longer than; some species, however, can reach a length of.
6.
The discovery of " Kulindroplax " in 2012, a fossil aplacophoran with a polyplacophoran-like armour, strongly supports this hypothesis, and shows that aplacophorans evolved from progenitors that bore valves.
7.
The discovery of " Kulindroplax " in 2012, a fossil aplacophoran with a polyplacophoran-like armour, strongly supports this hypothesis, and shows that aplacophorans evolved from progenitors that bore valves.
8.
The relationship with other molluscs, however, is apparent from some features of the digestive system; aplacophorans possess both a radula and a hermaphroditic, but caudofoveates have two sexes, and reproduce by external fertilization.
9.
His research focused on molluscs and more specifically on the ectoparasitic pyramidellid gastropods and the, shell-less, primary deep-sea aplacophorans, the biogeography of these animals, and the relationship between the molluscs and other animal groups.
10.
While other fossil taxa like " Acaenoplax " and " Phthipodochiton " showed intermediate features between aplacophorans and polyplacophorans, no unambiguous fossil with an aplacophoran-like body and a polyplacophoran-like shell has been found before " Kulindroplax ".
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