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Genus Parateinostoma Oppenheim, 1892 Type species: Hydrobia mana Tausch, 1886; by original designation. Remarks: Bandel and Riedel (1994) treated Parateinostoma as feminine, but the Greek ending -stoma (mouth, opening) is neuter (ICZN 1999, Art. 30.1.2.). Besides the type species, five species from the United States of America (White 1895; Yen 1951b) and two from China (Zhu 1980; Yü & Zhang 1982) have been classified in this family. The American species all significantly differ from Parateinostoma and are treated in a separate chapter below.
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Páll‐Gergely et al. (2026) studied this question.
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