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Keywords from Image Description:
Petromyzontiformes mouths PZSL. Top left Mordacia lapicida Gray Richardson Gray Linnaeus Linnaeus Petromyzon marinusMouth PZSL Petromyzon marinus Lampetra fluviatilisMouth PZSL Lampetra fluviatilis Geotria australisFemaleMouth PZSL Geotria australis Mordacia lapicidaMouth PZSL Mordacia lapicida Mordacia mordaxMouth PZSL