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Taxonomy
Pachydesma was named as a genus. It is extant.
It was reranked as Tivela (Pachydesma) by Clark (1915), Wagner and Schilling (1923) and Oldroyd (1925).
It was assigned to Tivela by Clark (1915), Wagner and Schilling (1923) and Oldroyd (1925); and to Veneroida by Sepkoski (2002).
It was reranked as Tivela (Pachydesma) by Clark (1915), Wagner and Schilling (1923) and Oldroyd (1925).
It was assigned to Tivela by Clark (1915), Wagner and Schilling (1923) and Oldroyd (1925); and to Veneroida by Sepkoski (2002).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1837 | Trigonella Conrad |
| 1915 | Tivela (Pachydesma) Clark p. 462 |
| 1923 | Tivela (Pachydesma) Wagner and Schilling p. 255 |
| 1925 | Tivela (Pachydesma) Oldroyd p. 6 |
| 2002 | Pachydesma Sepkoski |
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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. Tivela (Pachydesma)
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†Pachydesma sulcataria Vokes 1939
†Tivela (Pachydesma) diabloensis Clark 1915
†Tivela (Pachydesma) gabbi Clark 1915
†Tivela (Pachydesma) inezana Conrad 1856
Tivela (Pachydesma) stultorum Mawe 1823
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Invalid names: Cytherea (Trigonella) crassatelloides Conrad 1837 [synonym], Tivela scarificata Berry 1940 [synonym]
Invalid names: Trigonella Conrad 1837 [replaced]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class | |||||
| References: Aberhan et al. 2004, Kiessling 2004, Hendy et al. 2009 | |||||
Age range
Maximum range based only on fossils: base of the Lutetian to the top of the Late/Upper Pleistocene or 47.80000 to 0.01170 Ma
Minimum age of oldest fossil (stem group age): 41.3 Ma
Minimum age of oldest fossil (stem group age): 41.3 Ma
Collections (80 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lutetian | USA (Oregon) | Pachydesma weaveri (200870 200877 200878) | |
| Bartonian | USA (Washington) | Pachydesma aragoensis (203164) | |
| Bartonian | USA (Oregon) | Pachydesma aragoensis (201047 201049) | |
| Bartonian - Priabonian | Canada (British Columbia) | Pachydesma gastonensis (209751) | |
| Priabonian | USA (California) | Pachydesma inezana (205787) | |
| Chattian | USA (California) | Tivela inezana (11601) | |
| Early/Lower Miocene | USA (California) | Tivela diabloensis (44912 44921) Tivela gabbi (167645) Tivela inezana (71216 71223 71225 71227 71228 71229 71230 94850 94854 94856 94857 94868 203554 238174 238179 238180 238187 238189 238190) | |
| Middle Miocene | USA (California) | Tivela diabloensis (44940) Tivela gabbi (159672) | |
| Early/Lower Pliocene | USA (California) | Tivela stultorum (97241 97242 97404) | |
| Zanclean | Mexico (Baja California) | Tivela stultorum (154115) | |
| Pliocene | USA (California) | Tivela stultorum (96887) | |
| Late/Upper Pliocene | USA (California) | Pachydesma crassatelloides (238435 238459 238613) | |
| Piacenzian | USA (California) | Tivela stultorum (122752 186031 226581) | |
| Late/Upper Pliocene - Early/Lower Pleistocene | USA (California) | Pachydesma crassatelloides (238614) | |
| Gelasian | USA (California) | Pachydesma crassatelloides (207661 207662 207706 207714 207716) Tivela stultorum (214277 214278 214279 214280 214286 214287) | |
| Early/Lower Pleistocene | USA (California) | Tivela stultorum (168757) | |
| Pleistocene | Mexico (Baja California) | Tivela stultorum (96592 96594) | |
| Pleistocene | USA (California) | Tivela stultorum (201624) | |
| Middle Pleistocene | USA (California) | Tivela crassatelloides (222663) Tivela stultorum (71051) Tivela stultorum, Tivela scarificata (138723) | |
| Middle Pleistocene - Late/Upper Pleistocene | USA (California) | Pachydesma crassatelloides (222646) | |
| Late/Upper Pleistocene | USA (California) | Pachydesma crassatelloides (222674 226458) Tivela crassatelloides (222659 222660 222661 222662) Tivela stultorum (59063 96895 96936 160361 203417 219029 219030) | |
| Late/Upper Pleistocene | Mexico | Tivela stultorum (67641 67642) | |
| Late/Upper Pleistocene - Holocene | Mexico (Baja California) | Tivela stultorum (191984) |