Duck clam
| Mactridae Temporal range: Cretaceous to Present |
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| Shell of Spisula solida | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Veneroida |
| Family: |
Mactridae Lamarck, 1809 |
| Genera | |
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See text |
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See text
Mactridae, common name the trough shells or duck clams, is a family of saltwater clams, marine bivalve mollusks in the order Veneroida.
These clams have two short siphons, each with a horny sheath. The shell is shaped like a rounded-cornered equilateral triangle and there is a slight gape at the posterior. Each valve bears two cardinal teeth with four lateral teeth on the right valve and two on the left. The foot is white and wedge-shaped. They mostly inhabit the neritic zone.
Trough shells burrow in sand or fine gravel and never in muddy substrates.
According to WoRMS (2012), this family contains 37 genera:
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