Arcida
| Use attributes for filter ! | |
| Scientific name | Arcida |
|---|---|
| Rank | Order |
| Higher classification | Pteriomorphia |
| Date of Reg. | |
| Date of Upd. | |
| ID | 2222459 |
About Arcida
The Arcida is an extant order of bivalve molluscs. This order dates back to the lower Ordovician period. They are distinguished from related groups, such as the mussels, by having a straight hinge to the shells, and the adductor muscles being of equal size.