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Taxonomy
Micromactra was named by Dall (1894). It is extant. Its type is Mactra californica.
It was reranked as Mactra (Micromactra) by Pilsbry and Olsson (1941); it was reranked as Mactrotoma (Micromactra) by Coan et al. (2000); it was synonymized subjectively with Mactrotoma by Coan and Valentich-Scott (2012); it was reranked as Standella (Micromactra) by Signorelli (2019).
It was assigned to Mactra by Pilsbry and Olsson (1941); to Mactrotoma by Coan et al. (2000); and to Standella by Signorelli (2019).
It was reranked as Mactra (Micromactra) by Pilsbry and Olsson (1941); it was reranked as Mactrotoma (Micromactra) by Coan et al. (2000); it was synonymized subjectively with Mactrotoma by Coan and Valentich-Scott (2012); it was reranked as Standella (Micromactra) by Signorelli (2019).
It was assigned to Mactra by Pilsbry and Olsson (1941); to Mactrotoma by Coan et al. (2000); and to Standella by Signorelli (2019).
Subtaxa
Species lacking formal opinion data
Entered
by A. Hendy on 2007-01-20; modified by J. Marcot on 2026-04-20
Synonymy list
| Year | Name and author |
|---|---|
| 1894 | Micromactra Dall |
| 1941 | Mactra (Micromactra) Pilsbry and Olsson p. 11 |
| 2000 | Mactrotoma (Micromactra) Coan et al. |
| 2019 | Standella (Micromactra) Signorelli p. 60 |
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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.
Subg. Standella (Micromactra) Dall 1894
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Standella (Micromactra) angusta Reeve 1854
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Invalid names: Mactra (Micromactra) atacama Pilsbry and Olsson 1941 [synonym], Mactra ovalina Reeve 1854 [synonym]
Standella (Micromactra) janeiroensis Smith 1915
Standella (Micromactra) surinamensis Altena 1968
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Invalid names: Micromactra miskito Petuch 1998 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, c = class | |||||
| References: Aberhan et al. 2004, Sanchez Roig 1926 | |||||
Age range
Maximum range based only on fossils: base of the Burdigalian to the top of the Early/Lower Pleistocene or 20.45000 to 0.77400 Ma
Minimum age of oldest fossil (stem group age): 15.98 Ma
Minimum age of oldest fossil (stem group age): 15.98 Ma
Collections (15 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burdigalian | Venezuela (Falcon) | Mactra maracaibensis (60144 60710) | |
| Late/Upper Miocene | Trinidad and Tobago | Mactra maracaibensis (60630) | |
| Late/Upper Miocene | Colombia | Mactra macescens (131220) | |
| Early/Lower Pliocene | Trinidad and Tobago | Mactra maracaibensis (60412 60415) | |
| Pliocene | Ecuador (Manabi) | Mactra atacama (51886) | |
| Early/Lower Pleistocene | Costa Rica | Mactra sp. (66777) | |
| Early/Lower Pleistocene | USA (Florida) | Mactra undula (79331) | |
| Early/Lower Pleistocene | Ecuador (Manabi) | Mactra sp. (48665) | |
| Pleistocene | South Africa | Mactra ovalina (122940 122941 122943 122944 122945) |