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Taxonomy
Hemimactra was named by Swainson (1840) [Sepkoski's age data: T R]. It is extant.
It was reranked as Spisula (Hemimactra) by Glenn (1904), Olsson (1914), Packard (1916), Clark and Arnold (1923), Gardner (1947).
It was assigned to Spisula by Glenn (1904), Olsson (1914), Packard (1916), Clark and Arnold (1923), Gardner (1947); to Veneroida by Sepkoski (2002); and to Mactridae by Hendy et al. (2008).
It was reranked as Spisula (Hemimactra) by Glenn (1904), Olsson (1914), Packard (1916), Clark and Arnold (1923), Gardner (1947).
It was assigned to Spisula by Glenn (1904), Olsson (1914), Packard (1916), Clark and Arnold (1923), Gardner (1947); to Veneroida by Sepkoski (2002); and to Mactridae by Hendy et al. (2008).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1840 | Hemimactra Swainson p. 369 |
| 1904 | Spisula (Hemimactra) Glenn p. 286 |
| 1914 | Spisula (Hemimactra) Olsson p. 14 |
| 1916 | Spisula (Hemimactra) Packard p. 283 |
| 1923 | Spisula (Hemimactra) Clark and Arnold p. 153 figs. Plate 19, Figs 1a, 1b, 4 |
| 1947 | Spisula (Hemimactra) Gardner p. 220 |
| 2002 | Hemimactra Sepkoski |
| 2008 | Hemimactra Hendy et al. |
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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. Hemimactra Swainson 1840
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†Spisula (Hemimactra) confraga Conrad 1833
†Spisula (Hemimactra) harrisi Olsson 1914
†Spisula (Hemimactra) selbyensis Packard 1916
†Spisula (Hemimactra) sookensis Clark and Arnold 1923
†Spisula (Hemimactra) subparilis Conrad 1841
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: f = family, 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 (93 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chattian | Canada (British Columbia) | Spisula sookensis (91214 206743 206861) | |
| Burdigalian | USA (Georgia) | Spisula densa (42069 42109 42212 42213) | |
| Burdigalian | USA (Florida) | Spisula densa (42605 42642 42657 42663 42678 42682) Spisula densa, Spisula dodona (42482) Spisula dodona (42656) | |
| Burdigalian | USA (Maryland) | Spisula subparilis (79101) | |
| Serravallian | USA (Florida) | H. craspeota (80018) | |
| Serravallian | USA (Maryland) | Spisula subparilis (79103 79104 79105 79106 79107 79108 79109 79110 79111 79112 79113 79114 79115 79352 79353) | |
| Zanclean | USA (South Carolina) | Spisula similis (60940) | |
| Early/Lower Pliocene - Late/Upper Pliocene | USA (North Carolina) | Spisula modicella (59330) | |
| Pliocene | USA (Virginia) | Spisula confraga (59293) | |
| Pliocene | USA (North Carolina) | H. duplinensis (151326) H. modicella (79248) | |
| Late/Upper Pliocene | USA (Virginia) | H. solidissima (80036) | |
| Late/Upper Pliocene | USA (North Carolina) | H. solidissima (69018) Spisula similis (58895 59309 59310) | |
| Late/Upper Pliocene | USA (Florida) | Spisula subparilis (79761) | |
| Gelasian | USA (North Carolina) | Spisula similis (71138) | |
| Early/Lower Pleistocene | USA (North Carolina) | H. modicella, H. sp., Spisula solidissima (80033) H. modicella, Spisula solidissima (80035) H. solidissima (80034) Spisula similis (58897 59315) | |
| Early/Lower Pleistocene | USA (South Carolina) | Spisula similis (60944) | |
| Pleistocene | USA (New Jersey) | Spisula solidissima (66601 66604 66611 66612 66614 66616 66617 66620 66621) | |
| Pleistocene | USA (South Carolina) | H. sp. (80053 80083) Mactra similis (203376) | |
| Pleistocene | USA (Virginia) | Mactra solidissima (7108) | |
| Pleistocene | USA (New York) | Spisula solidissima (66379 66381) | |
| Pleistocene | USA (Delaware) | Spisula solidissima (66703) | |
| Middle Pleistocene | USA (Florida) | H. sp. (80046) | |
| Late/Upper Pleistocene | USA (Maine) | Spisula solidissima (66355) | |
| Late/Upper Pleistocene | USA (Massachusetts) | Spisula solidissima (61269) | |
| Late/Upper Pleistocene | USA (North Carolina) | H. solidissima (69047) Spisula solidissima (66742 66744 66747 69045) | |
| Late/Upper Pleistocene | USA (South Carolina) | H. sp. (79956 79957) Mactra similis (92406) Spisula similis (69046) Spisula solidissima (60923 60927 60928 60930 66755 66756) | |
| Late/Upper Pleistocene | USA (Virginia) | Spisula solidissima (57705 57706 57707 69048) | |
| Late/Upper Pleistocene | USA (Florida) | H. solidissina (69034) H. solidssima (69040) Spisula solidissima (34269) | |
| Late/Upper Pleistocene | USA (Maryland) | Spisula solidissima (66721) | |
| Holocene | USA (Louisiana) | Spisula solidissima (92776) |