Onchnesoma
| Onchnesoma | |
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| Genus: | Onchnesoma Koren & Danielssen, 1875 |
| species | |
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4 (see text) | |
Onchnesoma is one of the two genera that constitute the family Phascolionidae of Phylum Sipuncula, described by Koren and Danielssen established in 1873 as the type species to Onchnesoma steenstrupii.