Larval something like bivalve

[kmeadvhplankton]

Any ideas on this marine plankton clam-looking plankton? It is from the Kennebec River Estuary (again) in Maine. It appeared to have a ring of short hairs around the outside - cilia or just a mirage?

[dtsh]

With no scale to reference it's just a wild guess, but possibly an ostracod?

[kmeadvhplankton]

I understand. I haven't learned to scale things yet. We use a grid slide divided into 1000 squares so when the corner of the square is in the picture, it is a reference.

Thanks for the suggestion. I will look those up.
Kat