species Ptychorhynchus schoedei (Haas, 1930): synonymy

Nodularia undulata Haas, 1910
Haas, 1910. Ann. Mag. Nat. Hist. 6: 497.
Haas, 1910. Conch. Cab. 9 (pt. 2, h. 42): pl. 10, figs. 2-3.
Haas, 1911. Conch. Cab. 9 (pt. 2, h. 45): 100.
(homonym of Unio undulata Say, 1817; renamed Unio schoedei Haas, 1930)

Nodularia (s.s.) undulata — Haas (1911), Simpson (1914)
Unio schoedei — Haas (1969)
Ptychorhynchus schoedei — He & Zhuang (2013)

Unio schoedei Haas, 1930
Haas, 1910. Ann. Mag. Nat. Hist. 6: 497 [as ‘Nodularia undulata’].
Haas, 1930. Senckenbergiana 12(1): 6 [as ‘schödei’].
(new name for Nodularia undulata Haas, 1910)

Unio schoedei — Haas (1969)
Middendorffinaia (Pseudopotomida) schoedi [sic] — Moskvicheva & Starobogatov (1973)
Nodularia schoedei — Graf & Cummings (2007), Bogan (2010)
Ptychorhynchus schoedei — He & Zhuang (2013), Zieritz et al. (2018), Graf & Cummings (2021)

Middendorffinaia schoedi Moskvicheva & Starobogatov, 1973
‘Haas’ Moskvicheva & Starobogatov, 1973. Byull. Mosk. Obshch.. Ispyt. Prir. 78(2): 31.
(error for Unio schoedei Haas, 1930)