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 | The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)FM(U)otW(aolcb) is the web version of the MUSSEL Project Database. Follow the links to browse the data or use the custom Google search field. Either way, you win! 
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 Publication Haas (1919): summarypublication summary
 Complete CitationHaas, F. 1919. Die Unioniden. [in] H.C. Küster, Systematisches Conchylien-Cabinet von Martini und Chemnitz 9 (pt. 2, h. 51): 257-288, pls. 60-63. Available electronically. Attributed Nominal GeneraProtunio Haas, 1912Haas, 1912. Conch. Cab. 9 (pt. 2, h. 46): pl. 32.
 Haas, 1913. Nachr. Bl. Dtsch. Malak. Ges. 45: 37.
 Haas, 1919. Conch. Cab. 9 (pt. 2, h. 51): 257.
 Type species: Unio messageri Bavay & Dautzenberg, 1901 (orig. desig.) = Protunio messageri
 Velunio Haas, 1919Haas, 1919. Conch. Cab. 9 (pt. 2, h. 51): 276. [nomen nudum]
 Haas, 1920. Conch. Cab. 9 (pt. 2, h. 52): 292.
 (intro'd as sub-gen. of Physunio Simpson, 1900)
 Type species: Unio velaris Sowerby, 1868 (monotypy) = Lamellidens friersoni
Attributed Nominal Species| Parreysia dalliana Frierson, 1913
  Frierson, 1913. Nautilus 26: 142. 
  ‘Gould’ Haas, 1919. Conch. Cab. 9 (pt. 2, h. 51): pl. 32, figs. 3-4. Type(s): LECTOTYPE SMF_13699B, Lashio Fl. Lashio nordl Shan Staaten.
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 | Trapezoideus foliaceus Haas, 1919‘Gould’ Haas, 1919. Conch. Cab. 9 (pt. 2, h. 51): pl. 32, figs. 3-4.
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 | Trapezoideus zayleimanensis Haas, 1919‘Preston’ Haas, 1919. Conch. Cab. 9 (pt. 2, h. 51): 267.
 ‘Preston’ Haas, 1969. Das Tierreich 88: 76.
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 Taxonomic OpinionsHarmandia castelneaui Rochebrune, 1904 = Triplodon corrugatus Harmandia somboriensis Rochebrune, 1882 Physunio (s.s.) cambodiensis (Lea, 1856) = Lens contradens Physunio (s.s.) eximius (Lea, 1856) = Lens eximius+ Unio semiquadrata Sowerby, 1866
 Physunio (s.s.) gravidus (Lea, 1856) = Physunio superbus+ Unio abnormis Morelet, 1862
 + Unio superbus Sowerby, 1867
 Physunio (s.s.) inornatus (Lea, 1856) = Lens inornatus Physunio (s.s.) micropterus (Morelet, 1866) = Lens micropterus Physunio (s.s.) semialatus (DeShayes & Jullien, 1874) = Lens micropterus+ Unio micropterus Fischer, 1891
 Protunio messageri (Bavay & Dautzenberg, 1901) Trapezoideus dallianus (Frierson, 1913) = Yaukthwa dalliana+ Unio foliaceus Martens, 1899
 Trapezoideus exolescens (Gould, 1843) = Trapezidens exolescens Trapezoideus foliaceus (Gould, 1843)+ Unio peguensis Anthony, 1865
 Trapezoideus foliaceus (Gould, 1843) = Yaukthwa peguensis Trapezoideus ludovicianus (Rochebrune, 1882) = Lens micropterus Trapezoideus misellus (Morelet, 1865) = Lens misellus+ Unio siamensis Lea, 1866
 + Anodon pallegoixi Sowerby, 1867
 + Unio comptus Deshayes & Jullien, 1876
 + Unio fragilis Nevill, 1877
 + Unio exolescens Hanley & Theobald, 1874
 + Trapezoideus foliaceus var. zayleymanensis Preston, 1912
 Trapezoideus misellus (Morelet, 1865) = Trapezidens exolescens Trapezoideus misellus (Morelet, 1865) = Lens pallegoixi Trapezoideus misellus (Morelet, 1865) = Lens comptus Trapezoideus misellus (Morelet, 1865) = Yaukthwa zayleymanensis Trapezoideus subclathratus (von Martens, 1899) = Indonaia subclathrata |