Chesapecten
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Chesapecten Temporal range: 20.4–0.7 Ma Early Miocene to Early |
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| Chesapecten jeffersonius (outside) | |
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| Chesapecten jeffersonius (inside) | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Ostreoida |
| Family: | Pectinidae |
| Genus: | †Chesapecten |
| Binomial name | |
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Chesapecten (Ward & Blackwater, 1975) |
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Chesapecten is an extinct genus of scallop known from marine strata from the early Miocene to the early of the Eastern United States.
Like some other large scallops, the shells of Chesapecten are characterized by a pattern of wide ribs which radiate outward from the apex of the shell. A distinctive feature of Chesapecten is that the radial ribs on its shell are crossed by much smaller, rough, concentric ribs, which follow the contours of the edges of the shell (are "conmarginal"). The left valve of Chesapecten is more convex than the right valve. The adductor muscle scar is large and rounded.
The geographical distribution of Chesapecten is limited to the Atlantic coastal plain of North America, where it can be found as far south as Florida, and as far north as Delaware. One species of Chesapecten, Chesapecten jeffersonius, is the state fossil of Virginia.
Chesapecten was the first genus of North American fossil to be described and illustrated; a drawing of C. jeffersonius appeared in English naturalist Martin Lister's Historiae Conchyliorum, Liber III in 1687. However, Lister did not give Chesapecten its name.Chesapecten was formally named in 1975 by the paleontologists Ward and Blackwater. In 1980, it was assigned to the family Pectinidae by Harold E. Vokes. The name Chesapecten comes from the Chesapeake Bay, where eroding cliffs and outcrops along the beaches regularly expose specimens.
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