|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Bivalvia - Pectinida - Pectinidae
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).
|Year||Name and author|
|1824||Pecten jeffersonius Say p. 133|
|1898||Pecten (Lyropecten) jeffersonius Dall p. 722|
|1904||Pecten (Chlamys) jeffersonius Glenn p. 378|
|1932||Chlamys (Lyropecten) jeffersonius Mansfield p. 59|
|1936||Pecten (Chlamys) jeffersonius Mansfield p. 174|
|1943||Chlamys (Lyropecten) jeffersonia Gardner pp. 32, 33|
|1975||Chesapecten jeffersonius Ward and Blackwelder p. 13|
|1987||Chesapecten jeffersonius Gibson p. 69|
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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 1975||hesapecten 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.|