| Synonym | Auteur | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Contracaecum aduncum | (Rudolphi, 1802) | synonym | No | senior synonym |
new combination |
| Contracaecum benimasu | Fujita, 1932 | synonym | No | junior synonym |
original combination |
| Contracaecum crassicaudatum | Fujita, 1939 | synonym | No | junior synonym |
original combination |
| Contracaecum elongatum | Fujita, 1939 | synonym | No | junior synonym |
original combination |
| Contracaecum hippoglossi | Fujita, 1932 | synonym | No | junior synonym |
original combination |
| Contracaecum hypomesi | Fujita, 1932 | synonym | No | junior synonym |
original combination |
| Contracaecum longispiculum | Fujita, 1940 | synonym | No | junior synonym |
original combination |
| Contracaecum ochotense | Fujita, 1932 | synonym | No | junior synonym |
original combination |
| Contracaecum oshoroensis | Fujita, 1940 | synonym | No | junior synonym |
original combination |
| Hysterothylacium aduncum | (Rudolphi, 1802) | accepted name | Yes | senior synonym |
new combination |
| Thynnascaris adunca | unspecified | synonym | No | junior synonym |