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Taxonomy
Mytilus mathewsoni expansus was named by Arnold (1907) [DISTRIBUTION: Late Oligocene; Pacific Coast, North America.]. Its type specimen is USNM 164968, a shell, and it is a 3D body fossil.
It was recombined as Mytilus mathewsonii expansus by Arnold (1907); it was recombined as Mytilus expansus by Loel and Corey (1932); it was recombined as Crenomytilus expansus by Addicott (1973) and Schoellhamer et al. (1981); it was recombined as Mytilus (Crenomytilus) expansus by Moore (1983).
It was recombined as Mytilus mathewsonii expansus by Arnold (1907); it was recombined as Mytilus expansus by Loel and Corey (1932); it was recombined as Crenomytilus expansus by Addicott (1973) and Schoellhamer et al. (1981); it was recombined as Mytilus (Crenomytilus) expansus by Moore (1983).
Synonymy list
| Year | Name and author |
|---|---|
| 1907 | Mytilus mathewsonii expansus Arnold p. 528 figs. pl. 43, fig. 2 |
| 1932 | Mytilus expansus Loel and Corey p. 205 figs. Plate 34, figure 1 |
| 1973 | Crenomytilus expansus Addicott p. 23 |
| 1981 | Crenomytilus expansus Schoellhamer et al. p. D92 |
| 1983 | Mytilus (Crenomytilus) expansus Moore p. A63 figs. Plate 15, figure 5 |
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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.
†Crenomytilus expansus Arnold 1907
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Diagnosis
No diagnoses are available