Distinguishing Characteristics |
Bivalve (2 shells); shell circular, fan-like, with extensions or wings on either side of beaks, wings equal in length when not broken or worn down; moderately inflated, right shell more inflated than left; color brown to gray on left (top) shell, lighter in between ribs; right (bottom) shell white, no markings; 12-17 strong radial ribs; fine concentric lines, more prominent between ribs in larger shells, runs over ribs in smaller shells; ventral edges scalloped. |
Similar Species |
The calico scallop has a light background with various mottling and a reddish upper interior. The bay scallop is usually a solid color with white interior and the right shell (which is usually white) is distinctly more convex than the left shell. Also, the bay scallop has 12-17 ribs while the calico scallop has 17-23 (excluding the wings). |
Habitat |
Bays, on mud and sandy bottoms, free-living, does not burrow |
Maximum Size |
10.2 cm (4 in) |
Other Common Names |
|
Previous Scientific Names |
|
Comments |
There are 3 varieties of A. irradians in the Gulf of Mexico. A. irradians amplicostatus does not occur east of the Mississippi River. |