Molluscan Phylogeny: The Paleontological Viewpoint

@article{Runnegar1974MolluscanPT,
  title={Molluscan Phylogeny: The Paleontological Viewpoint},
  author={Bruce Runnegar and J. Pojeta},
  journal={Science},
  year={1974},
  volume={186},
  pages={311 - 317}
}
Stasek (1) theorized that the extant mollusks are the progeny of three separate lineages that separated before the phylum was well established. He wrote that no known intermediate forms, fossil or living, bridge the "enormous gaps between any two of the three lineages," and therefore treated each as a separate subphylum. These subphyla are (i) the subphylum Aculifera Hatscheck 1891, containing only the class Aplacophora, derived from the most primitive ancestors of the Mollusca; (ii) the… Expand
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