Mactridae, common name the trough shells or duck clams, is a family of saltwater clams, marine bivalve mollusks in the order Venerida.
Mactridae Temporal range: Cretaceous to Present
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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 sand or fine gravel and never in muddy substrates.[1]
According to the World Register of Marine Species (2012), this family contains 37 genera:[2]