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Chesapecten jeffersonius septenarius

Bivalvia - Pectinida - Pectinidae

Taxonomy
Pecten septenarius was named by Say (1824) [DISTRIBUTION: Early Pliocene; Atlantic Coastal Plain.]. It is not a trace fossil.

It was recombined as Pecten (Lyropecten) jeffersonius septenarius by Dall (1898); it was recombined as Pecten (Chlamys) jeffersonius septenarius by Glenn (1904) and Mansfield (1936); it was recombined as Chlamys (Lyropecten) jeffersonia septenaria by Gardner (1943); it was recombined as Chesapecten septenarius by Ward and Blackwelder (1975); it was recombined as Chesapecten jeffersonius septenarius by Gibson (1987).

Synonymy list
YearName and author
1824Pecten septenarius Say p. 136 figs. Plate 9, Fig. 3
1898Pecten (Lyropecten) jeffersonius septenarius Dall p. 722
1904Pecten (Chlamys) jeffersonius septenarius Glenn p. 379
1936Pecten (Chlamys) jeffersonius septenarius Mansfield p. 174
1943Chlamys (Lyropecten) jeffersonia septenaria Gardner p. 34
1975Chesapecten septenarius Ward and Blackwelder p. 15
1987Chesapecten jeffersonius septenarius Gibson p. 71

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classBivalvia
—Eubivalvia
subclassAutobranchia(Groblen 1894)
infraclassPteriomorphia(Beurlen 1944)
—OstreomorphiFerussac 1822
RankNameAuthor
—OstreioniFerussac 1822
—OstreataFerussac 1822
superorderOstreiformiiFerussac 1822
orderPectinida(Gray 1854)
suborderPectinidina(Adams and Adams 1858)
superfamilyPectinoideaRafinesque 1815
—PectinoidaeRafinesque 1815
familyPectinidaeWilkes 1810
genusChesapecten
speciesjeffersonius(Say 1824)
subspeciesseptenarius(Say 1824)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

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Diagnosis
ReferenceDiagnosis
L. W. Ward and B. W. Blackwelder 1975Chesapecten septenarius has very heavy deposits of calcite on the interior of the valves, usually 6 to 7 plicae, a shallow byssal notch, an only slightly differentiated byssal fasciole, and broad ribs with flattened summits and square sides.