1a) Edge opposite hinge is rounded

1b) Each half is longer than it is wide

1c) Triangular shell with rounded corners

Go to 2

Go to 3

Go to 14




2a) Ridges extend from hinge to outer edge
(perpendicular to hinge)

2b) Ridges circle shell (parallel to hinge)

Go to 4

Go to 5




3a) Shell is rough (ribs, spines)

3b) Shell is smooth

Go to 6

Go to 7




4a) Hinge with ears

4b) Hinge without ears

Atlantic Calico Scallop

Go to 8




5a) Thin, fragile, lightweight

5b) Thick and heavy shell

Go to 10

Northern Quahog




6a) Fan-shaped

6b) Not fan-shaped

Go to 11

Go to 12




7a) Shell is slender, 6 times longer than wide

7b) Shell is rectangular, 3 times longer than wide

Atlantic Jackknife

Stout Tagelus




8a) Piano hinge (teeth-like)

8b) No piano hinge

Incongruous Ark

Go to 9




9a) Ribs covered with raised scales (prickly)

9b) No raised scales on ribs

Florida Prickly Cockle

Atlantic Giant Cockle




10a) Almost translucent, paper thin

10b) Not translucent

Common Jingle

Go to 13




11a) Approximately 30 ribs covered with small spines

11b) Fewer than 20 ribs, some with large spines

Saw-toothed Penshell

Stiff Penshell




12a) Angel-wing shaped

12b) Not angel-wing shaped

Go to 15

Go to 16




13a) Beak curves forward

13b) Beak does not curve forward

Elegant Dosinia

Cross-hatched Lucine




14a) Crisscross pattern of ridges

14b) No crisscross pattern

Cross-barred Venus

Go to 17




15a) Approximately 30 sharply beaded ribs
covering whole surface

15b) Strong ribbing only on one end of shell

Angel Wing

False Angel Wing




16a) Triangular shell with wing-like extensions

16b) Oval or circle-shaped; no wing-like extensions

Atlantic Wing Oyster

Go to 19




17a) One end of shell pointed, other end rounded

17b) Both ends pointed

Channeled Duckclam

Go to 18




18a) Beak central

18b) Beak towards one end of shell

Atlantic Surfclam

Variable Coquina




19a) Strong radial ribbing

19b) No distinct ribbing

Ribbed Mussel

Eastern Oyster