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Taxonomy
Arca hornii was named by Gabb (1864). It is a 3D body fossil. Its type locality is UCMP 3578, east of Marsh Creek, which is in a Ypresian coastal sandstone in the Meganos Formation of California.
It was recombined as Halonanus hornii by Stewart (1930); it was recombined as Pachecoa (Pachecoa) hornii by Moore (1983); it was recombined as Halonanus horni by Nilsen (1987); it was recombined as Pachecoa hornii by Hendy (2020).
It was recombined as Halonanus hornii by Stewart (1930); it was recombined as Pachecoa (Pachecoa) hornii by Moore (1983); it was recombined as Halonanus horni by Nilsen (1987); it was recombined as Pachecoa hornii by Hendy (2020).
Subspecies
Sister species lacking formal opinion data
Synonymy list
Year | Name and author |
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1864 | Arca hornii Gabb p. 194 figs. PI. 30, Fig. 263 |
1927 | Arca hornii Hanna p. 272 |
1930 | Halonanus hornii Stewart pp. 79 - 80 figs. Plate 10, fig. 6 |
1983 | Pachecoa (Pachecoa) hornii Moore pp. A48 - A49 figs. Plate 10, figure 7 |
1987 | Halonanus horni Nilsen pp. 90, 91 |
2020 | Pachecoa hornii Hendy |
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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.
†Pachecoa hornii Gabb 1864
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†Pachecoa (Pachecoa) hornii elusa Clark and Woodford 1927
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Diagnosis
No diagnoses are available