Scheltema, Amélie H. 1993. Aplacophora as progenetic aculiferans and the coelomate origin of mollusks as the sister taxon of Sipuncula. Biological Bulletin, Marine Biological Laboratory, Woods Hole 184(1): 57-78.
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Scheltema, A. H.
1993
Aplacophora as progenetic aculiferans and the coelomate origin of mollusks as the sister taxon of Sipuncula