Acosmia
Genus of ecdysozoans
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Acosmia is an extinct genus of marine worm from the Cambrian aged Chengjiang biota of Yunnan, China. It is represented by a single rare species, Acosmia maotiania, that reached 4.5 cm in length and 9 mm in width.[1] It was likely a burrowing animal that fed by deposit feeding.[2] While originally suggested it to be a priapulid (penis worm), a 2020 study proposed to be a stem-group ecdysozoan, due to lacking the radial pharygneal armature that characterises modern ecdysozoans, including priapulids.[2] Later studies suggested that Acosmia was more likely a crown-group ecdysozoan possibly alied with nematoids.[3][4]
| Acosmia Temporal range: | |
|---|---|
| |
| Fossil specimen | |
Scientific classification  | |
| Kingdom: | Animalia |
| Superphylum: | Ecdysozoa |
| Genus: | †Acosmia Chen & Zhoi 1997 |
| Species: | †A. maotiania |
| Binomial name | |
| †Acosmia maotiania Chen & Zhoi 1997 | |
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