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Taxonomy
Arca (Arca) williamsoni was named by Olsson (1967) [DISTRIBUTION: Pliocene-Pleistocene; Florida.]. Its type specimen is USNM 645148, a shell, and it is not a trace fossil.
Sister species lacking formal opinion data
A. bellonii, A. bravoensis, A. cancellata, A. carinata, A. gurgitis, A. limatella, A. macnairyensis, A. montensis, A. nana, A. pakistanica, A. pergracilis, A. securiculata, A. tailleburgensis, A. triasina, A. halmyrus, A. montensis, A. fruthi, A. stillicidum, A. mikkula, A. waltonia, A. fracta, A. gabrielis, A. veatchi
Synonymy list
| Year | Name and author |
|---|---|
| 1967 | Arca (Arca) williamsoni Olsson p. 6 figs. pl. 2, figs. 2a-b |
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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.
†Arca (Arca) williamsoni Olsson 1967
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, f = family | |||||
| References: Aberhan et al. 2004, Mikkelsen and Bieler 2008 | |||||
Age range: Late/Upper Pliocene or 3.60000 to 2.58800 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Pliocene | USA (Florida) | Arca williamsoni (79761) |