Dekatriata
| Dekatriata Temporal range: | |
|---|---|
| Eurypterus remipes, a eurypterid | |
| Araneus diadematus, an arachnid | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Clade: | Planaterga |
| Clade: | Dekatriata Lamsdell, 2013 |
| Groups | |
| |
Dekatriata is a clade of planatergan chelicerates including the groups Arachnida, Chasmataspidida, Eurypterida and additionally two stem-genera Winneshiekia and Houia. Dekatriata is defined by an opisthosoma with 13 segments as groundplan (the number proposed to be secondarily reduced in most arachnid orders) and fused, plate-like appendages on the first opisthosomal segment (somite VII).