Pectinida is a taxonomic order of large and medium-sized saltwater clams, marine bivalve molluscs, commonly known as scallops and their allies.[1] It is believed that they began evolutionarily in the late Middle Ordovician epoch; many species, of course, are still extant.[2]
| Pectinida
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|---|---|
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| Aequipecten opercularis | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Subclass: | Pteriomorphia |
| Order: | Pectinida |
| Families | |
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See text | |
| Synonyms | |
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Pectinoida | |
In 2010 a new proposed classification system for the Bivalvia was published by Bieler, Carter & Coan, revising the classification of the Bivalvia, including the order Pectinida.[3]
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