D1. Coenosteum
Skeleton between corallites within a colony
| Character State | Definition | Illustration |
| absent | None |  |
| fused walls | Highly reduced |  |
| narrow (< valley width) | Narrow (< valley width) |  |
| medium (= valley width) | Medium (= valley width) |  |
| wide (> valley width) | Wide (> valley width) |  |
