Retrieving "Protobranchia" from the archives

Cross-reference notes under review

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1. Bivalve

   Linked via "Protobranchia"

   | Heterodonta | Complex hinge teeth; varied lifestyles | Global; dominance in soft sediments | Mercenaria, Venerupis |
   | Paleoheterodonta | Primitive hinge structure; lack of complex siphons/) | Freshwater systems (rivers, lakes) | Unionoida species |
   | Protobranchia | Simple gills/); [deposit feed…