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Plectambonites youngiana
Taxonomy
Leptaena transversalis youngiana was named by Davidson (1870).
It was recombined as Leptaena youngiana by Davidson (1883); it was recombined as Plectambonites youngiana by Reed (1917); it was recombined as Bimuria youngiana by Williams (1962) and Candela and Harper (2014).
It was recombined as Leptaena youngiana by Davidson (1883); it was recombined as Plectambonites youngiana by Reed (1917); it was recombined as Bimuria youngiana by Williams (1962) and Candela and Harper (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1870 | Leptaena transversalis youngiana Davidson p. 320 figs. pl. xlvii, figs. 19, 20 |
| 1883 | Leptaena youngiana Davidson p. 168 figs. pl. xii, figs. 14-16 |
| 1917 | Plectambonites youngiana Reed pp. 889 - 890 figs. pl. xvi, figs. 14-18 |
| 1962 | Bimuria youngiana Williams pp. 174 - 175 figs. P1. XVI, figs. 38-41; P1. XVII, figs. 1-3 |
| 2014 | Bimuria youngiana Candela and Harper pp. Supplement 1 |
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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.
†Plectambonites youngiana Davidson 1870
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Strongly concavo-convex Bimuria with the pedicle valve about one-half as deep as long, wider than long in young stages of growth but adult shells commonly longer than wide with a subquadrate outline, anterior commissure of adult specimens rectimarginate and more commonly sulcate with a high median fold in the pedicle valve rarely flanked by lateral plicae; surface ornament of concentric comae originating at about 6 mm. from the umbo of the pedicle valve; dorsal interior with a median septum more or less buried in thick deposits of secondary shell substance adherent also to the submedian septa, which extend to the anterior margin; outer ridges to the lophophore and muscle apparatus strongly developed, curved and convergent anteriorly with the submedian septa. |