Mactridae, common name the trough shellsorduck clams, is a family of saltwater clams, marine bivalve mollusks in the order Venerida.
| Mactridae Temporal range: Cretaceous to Present | |
|---|---|
| |
| Shell of Spisula solida | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Venerida |
| Superfamily: | Mactroidea |
| Family: | Mactridae Lamarck, 1809 |
| Genera | |
|
See text. | |
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.[1]
Trough shells burrow in sandorfine gravel and never in muddy substrates.[1]
According to the World Register of Marine Species (2012), this family contains 37 genera:[2]
 | This bivalve-related article is a stub. You can help Wikipedia by expanding it. |