Species Ptychatractus

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^ ptychatractus ligatus (mighels & c.b. adams, 1842).  retrieved through: world register of marine species on 29 april 2010.
^ ptychatractus occidentalis stearns, 1873.  retrieved through: world register of marine species on 29 april 2010.
^ ptychatractus youngi kilburn, 1975.  retrieved through: world register of marine species on 29 april 2010.






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