| In Mysidiella newtonae n. sp., from the early Norian of the Wallowa Terrane of Oregon, the lunule is even shorter and more deeply incurved than in M. orientalis. |
| Notches are ambulacral lunules that form close enough to the ambitus that the ambitus is unable to close over the distal part of the notch to form a closed lunule. |
| The lunule in the southern quahog is at least as wide as high in the southern quahog, but is narrower in the northern quahog. |
| There is no lunule, but a large external ligament is very prominent just back of the beaks. |
| The lateral teeth are the stronger, and the lunule is upon the right valve only. |
| The pale half-moon shape at the base of each nail is called the lunule, which shows where the hardening process is not yet complete. |
