| author | date | title | journal / publication | Leidy J | 1852 | abs. | [M. ? (Eustomum) c.] | Proceed. Acad. nat. sc. Philadelphia. 1852. 5: 350 |
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| Microstomum caudatum Leidy, 1852 | w | primary taxonomic authority (describer) | 350 | |
| Microstomum philadelphicum Leidy, 1852 | [with synonyms] | w | primary taxonomic authority (describer) | 350 |