- Cryptodrilus unicus Fletcher, 1889: 1540; Fletcher 1890: 991.
- Cryptodrilus purpureus Michaelsen, 1889: 3; Fletcher 1890: 990.
- Fletcherodrilus unicus typicus Michaelsen, 1891: 32; Michaelsen 1900: 178.
- Fletcherodrilus unicus var. purpureus: Michaelsen 1891: 32.
- Fletcherodrilus unicus var. pelewensis Michaelsen, 1891: 32.
- Plutellus (Plutellus) unicus f. typica: Michaelsen 1916: 6.
- Plutellus affinis Stephenson, 1932: 904.
- Fletcherodrilus unicus Jamieson 1971: 85.
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Data are not exhaustive. The database is permanently a work in progress.