Retrieving "Pectinida" from the archives

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1. Bivalve

   Linked via "Pectinida"

   Internally, the visceral mass is compressed between the two valves. Respiration occurs via large, complex gills/) (ctenidia) which serve a dual purpose: gas exchange and particle capture for alimentation. Water flows into the mantle cavity through inhalant siphons and exits via the exhalant siphon. This constant flow mechanism is also responsible for the class's noted susceptibility to [environmental toxins](/entries/environmental-…