Lucinidae: Bivalvia or Bivalves. Two Shell Mollusks. Examples are: Linga, Anodontia and codakia. "Buttercup Shells" are a common name for Anodontia or the Tiger lucine for Codakia.
Lucinidae

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Lucina nassula(2) 11.44mm & 10.81mm-Marco Island-Lot#16413
Two F++/NG Lucina nassula(2) 11.44mm & 10.81mm.Conrad, 1846 Collected at low tide on mud, sand and eel grass flats in 1979 Marco Island, Florida....
$5.00 Sale: $4.25

Max: 1

Lucinisca nassula (2) 10.97mm & 9.69mm."Marco Island" #17477
Two F+/F++ Lucinisca nassula (2) 10.97mm & 9.69mm. Conrad, 1846.Collected at low tide on mud, sand and eel grass flats in 1979.Marco Island,...
$4.50 Sale: $3.83

Max: 1