Taxonomic Hierarchy
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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Bilateria
– triploblasts |
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| Infrakingdom | Protostomia
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| Superphylum | Spiralia
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| Phylum | Mollusca
– mollusques, molusco, molluscs, mollusks |
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| Class | Bivalvia Linnaeus, 1758
– bivalves, clams, bivalves, palourdes, bivalve, mexilhão, ostra |
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| Subclass | Autobranchia
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| Infraclass | Heteroconchia
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| Order | Unionida
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| Superfamily | Unionoidea Rafinesque, 1820
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| Family | Unionidae Rafinesque, 1820
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| Subfamily | Gonideinae Ortmann, 1916
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| Tribe | Gonideini Ortmann, 1916
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| Genus | Ptychorhynchus Simpson, 1900 |
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Direct Children: |
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| Species | Ptychorhynchus denserugata (Haas, 1910)
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| Species | Ptychorhynchus liuovatus (He & Zhuang, 2013)
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| Species | Ptychorhynchus murinum (Heude, 1883)
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| Species | Ptychorhynchus pfisteri (Heude, 1874)
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| Species | Ptychorhynchus resupinatus (Martens, 1902)
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| Species | Ptychorhynchus schoedei (Haas, 1930)
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| Species | Ptychorhynchus schomburgianum (Heude, 1885)
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