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  1. Active mode of excretion across digestive tissues predates the origin of excretory organs
  2. Embryonic chirality and the evolution of spiralian left–right asymmetries
  3. The larval nervous system of the penis wormPriapulus caudatus(Ecdysozoa)
  4. Embracing the comparative approach: how robust phylogenies and broader developmental sampling impacts the understanding of nervous system evolution