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Taxonomy
Mactrotoma was named by Dall (1894). It is extant. Its type is Mactra fragilis.
It was reranked as Mactra (Mactrotoma) by Packard (1916), Hodson and Hodson (1931).
It was assigned to Mactra by Packard (1916), Hodson and Hodson (1931); and to Mactridae by Coan and Valentich-Scott (2012).
It was reranked as Mactra (Mactrotoma) by Packard (1916), Hodson and Hodson (1931).
It was assigned to Mactra by Packard (1916), Hodson and Hodson (1931); and to Mactridae by Coan and Valentich-Scott (2012).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1894 | Mactroderma Dall |
| 1894 | Mactrotoma Dall |
| 1894 | Micromactra Dall |
| 1916 | Mactra (Mactrotoma) Packard p. 278 |
| 1931 | Mactra (Mactrotoma) Hodson and Hodson |
| 1941 | Mactra (Micromactra) Pilsbry and Olsson p. 11 |
| 2000 | Mactrotoma (Micromactra) Coan et al. |
| 2012 | Mactrotoma Coan and Valentich-Scott p. 549 |
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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.
G. Mactrotoma Dall 1894 [surfclam]
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Mactrotoma angusta Reeve 1854
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Invalid names: Mactra (Micromactra) atacama Pilsbry and Olsson 1941 [synonym], Mactra ovalina Reeve 1854 [synonym]
Mactrotoma californica Conrad 1837 [California surfclam]
Mactrotoma fragilis Gmelin 1792
Mactrotoma isthmica Pilsbry and Lowe 1932
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Invalid names: Mactra (Micromactra) fonsecana Hertlein and Strong 1950 [synonym], Mactra (Micromactra) vanattae Pilsbry and Lowe 1932 [synonym]
Mactrotoma nasuta Gould 1851 [bent surfclam]
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Invalid names: Mactra hiantina Deshayes 1855 [synonym], Mactra revellei Durham 1950 [synonym]
†Mactrotoma quirosana Hodson 1931
Invalid names: Mactroderma Dall 1894 [synonym], Micromactra Dall 1894 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Packard 1916 | Shell with a depressed band on the dorsal area ; sculptured ; umbones adjacent ; gape pronounced ; resilifer large, shallow, apically roofed ; cardinals prominent, but thin ; posterior arm of the cardinals overhangs the chondophore ; accessories on the posterior arms anterior laminae arising from the dorsal sinus pallial line distant; epidermis thin and silky. |
Measurements
No measurements are available
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| Source: g = genus, c = class | |||||
| References: Sanchez Roig 1926, Aberhan et al. 2004 | |||||
Age range
Maximum range based only on fossils: base of the Chattian to the top of the Holocene or 27.30000 to 0.00000 Ma
Minimum age of oldest fossil (stem group age): 23.04 Ma
Minimum age of oldest fossil (stem group age): 23.04 Ma
Collections (59 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chattian | USA (Alaska) | Mactra californica (195956 195960) | |
| Burdigalian | Venezuela (Zulia) | Mactra quirosana (60627) | |
| Burdigalian | Colombia (La Guajira) | Mactrotoma maracaibensis (156754 161894) | |
| Burdigalian | Venezuela (Falcon) | Mactra maracaibensis (60710) Mactra maracaibensis, Mactra quirosana (60144) | |
| Burdigalian | USA (Florida) | Mactra cymata (42482) | |
| Burdigalian - Langhian | Colombia (La Guajira) | Mactrotoma maracaibensis (157919) | |
| Langhian | Colombia (La Guajira) | Mactrotoma maracaibensis (136885 157828 158040 158041 159018) | |
| Late/Upper Miocene | Colombia | Mactra macescens (131220) | |
| Late/Upper Miocene | Trinidad and Tobago | Mactra maracaibensis (60630) | |
| Early/Lower Pliocene | Trinidad and Tobago | Mactra maracaibensis (60412 60415) | |
| Pliocene | Ecuador (Manabi) | Mactra atacama (51886) | |
| Late/Upper Pliocene | Venezuela | Mactra quirosana (131210) | |
| Late/Upper Pliocene | USA (Florida) | Mactra undula (59484) Mactrotoma sp. (69044) | |
| Early/Lower Pleistocene | Ecuador (Manabi) | Mactra sp. (48665) | |
| Early/Lower Pleistocene | USA (Florida) | Mactra fragilis (61309) Mactra undula (79331) Mactrotoma fragilus (69029) | |
| Early/Lower Pleistocene | Costa Rica | Mactra sp. (66777) | |
| Pleistocene | South Africa | Mactra ovalina (122940 122941 122943 122944 122945) | |
| Pleistocene | USA (California) | Mactra californica (237610 240566) | |
| Middle Pleistocene | USA (California) | Mactra californica (71051) Mactra nasuta (222995) | |
| Middle Pleistocene | USA (Florida) | Mactra fragilis (67069) | |
| Middle Pleistocene - Late/Upper Pleistocene | USA (California) | Standella californica (222646) | |
| Late/Upper Pleistocene | USA (California) | Mactra californica (59063 96566 96589 219029 219030 222660 240555 240604 240621) Mactra californica, Mactra nasuta (96895 160361) Standella californica (222674) | |
| Late/Upper Pleistocene | USA (Florida) | Mactrotoma fragilis (69034 69084 96538) | |
| Late/Upper Pleistocene | Mexico (Sonora) | Mactra californica, Mactra nasuta (44963) | |
| Late/Upper Pleistocene (interglacial) | Jamaica | Mactra fragilis (80408) | |
| Late/Upper Pleistocene | USA (South Carolina) | Mactra fragilis (66760) | |
| Late/Upper Pleistocene - Holocene | Panama (Panama) | Mactrotoma californica (160395) | |
| Holocene | USA (Louisiana) | Mactra fragilis (41935 92776) |