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Chesapecten jeffersonius

Bivalvia - Pectinida - Pectinidae

Pecten jeffersonius was named by Say (1824). It is a 3D body fossil.

It was recombined as Pecten (Lyropecten) jeffersonius by Dall (1898); it was recombined as Pecten (Chlamys) jeffersonius by Glenn (1904) and Mansfield (1936); it was recombined as Chlamys (Lyropecten) jeffersonius by Mansfield (1932); it was recombined as Chlamys (Lyropecten) jeffersonia by Gardner (1943); it was recombined as Chesapecten jeffersonius by Ward and Blackwelder (1975) and Gibson (1987).

Synonymy list
YearName and author
1824Pecten jeffersonius Say p. 133
1898Pecten (Lyropecten) jeffersonius Dall p. 722
1904Pecten (Chlamys) jeffersonius Glenn p. 378
1932Chlamys (Lyropecten) jeffersonius Mansfield p. 59
1936Pecten (Chlamys) jeffersonius Mansfield p. 174
1943Chlamys (Lyropecten) jeffersonia Gardner pp. 32, 33
1975Chesapecten jeffersonius Ward and Blackwelder p. 13
1987Chesapecten jeffersonius Gibson p. 69

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EubilateriaAx 1987
subclassAutobranchia(Groblen 1894)
infraclassPteriomorphia(Beurlen 1944)
OstreomorphiFerussac 1822
OstreioniFerussac 1822
OstreataFerussac 1822
superorderOstreiformiiFerussac 1822
orderPectinida(Gray 1854)
suborderPectinidina(Adams and Adams 1858)
superfamilyPectinoideaRafinesque 1815
PectinoidaeRafinesque 1815
familyPectinidaeWilkes 1810
speciesjeffersonius(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.

L. W. Ward and B. W. Blackwelder 1975hesapecten jetfe?·sonius has a very small byssal notch in adult forms, a moderately heavy shell, a byssal fasciole hardly differentiated from the auricle with respect to sculpture and ele- vation, and a right valve which becomes quite con- vex, especially during later growth, whereas con- vexity in the left valve is seen during earlier growth.