Hymenocarina
| Hymenocarina Temporal range: | |
|---|---|
| Diagram of Waptia | |
| Fossil of Canadaspis perfecta | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | Mandibulata |
| Order: | †Hymenocarina Clarke, 1900 |
| Genera | |
|
See text | |
| Synonyms | |
|
Canadaspidida Novozhilov in Orlov, 1960 | |
Hymenocarina is an order of extinct marine arthropods known from the Cambrian. They possess bivalved carapaces, typically with exposed posteriors. Members of the group are morphologically diverse and had a variety of ecologies, including as filter feeders and as predators. Recent research has generally considered them to be stem or crown group members of Mandibulata, due to the presence of mandibles in well-preserved species.