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Valid name
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Undellopsis marsupialis
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| Synonym | Undella marsupialis, forma subangulata Jörgensen, 1924 |
| Synonym | Undellopsis (Undellopsis) lineata Kofoid and Campbell, 1929 |
| Synonym | Undella marsupialis Brandt, 1906-1907 |
| Synonym | Undellopsis cubitum Kofoid and Campbell, 1929; 1939 |
| Synonym | Undellopsis (Undellopsis) marsupialis Kofoid and Campbell, 1929 |
| Synonym | Undellopsis subangulata Kofoid and Campbell, 1929; Balech, 1975 |
| Synonym | Undella marsupialis, forma subcylindrica Jörgensen, 1924 |
| Synonym | Undellopsis (Undellopsis) pacifica Kofoid and Campbell, 1929 |