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Macrochlamis
Taxonomy
Macrochlamis is a genus. It is not extant.
It was assigned to Pectinidae by Addicott (1974), Moore (1984) and Smith (1991); and to Pterioida by Sepkoski (2002).
It was assigned to Pectinidae by Addicott (1974), Moore (1984) and Smith (1991); and to Pterioida by Sepkoski (2002).
Species
Synonymy list
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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. †Macrochlamis
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†Macrochlamis magnolia Conrad 1857
†Macrochlamis magnolia ojaiensis Smith 1991
†Macrochlamis terebratulaeformis de Serres 1829
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. T. Smith 1991 | Valves equally convex, auricles equal, large, and smooth. Byssal notch present, hinge teeth variable, 0-3 weak pairs, hinge greater than half shell length. Beaks project slightly, equally beyond hinge. Radial ribs tend to be few, low in profile, and wider in the central part of the shell. Fine macrosculpture mainly concentric growth lines in California taxa.The correct spelling of the generic name is Macrochla- mis, as published by Sacco (1897a) in a synopsis preceding his major monograph of the same title (1897b). In the second publication, which contained complete descriptions of his new taxa, he spelled the genus Macrochlamys, a name preoccupied by a gastropod (Benson, 1832). This led later workers to reject the name as a primary homonym and to propose new names such as Gigantopecten GigantopectenRovereto, 1899 and Grandipecten Cossmann, 1914. The difference of one letter and designation of a type species in Sacco's first publication distinguishes it from the gastropod Macrochlamys and qualifies it as a valid name rather than a junior homonym."Macrochlamis" is used here for an important Califor- nia index species, because thorough revisions of European genera are beyond the scope of this paper. A European cognate species here referred to Macrochlamis terebra- tulaeformis (de Serres) is included for comparison. |
Measurements
No measurements are available
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| Source: f = family, o = order | |||||
| Reference: Kiessling 2004 | |||||
Collections (18 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oligocene | USA (California) | M. magnolia (72409) | |
| Chattian | USA (California) | Pecten magnolia (11601 52398) | |
| Chattian - Aquitanian | USA (California) | M. magnolia (37516 37517 37553) | |
| Early/Lower Miocene | USA (California) | Lyropecten magnolia (94852) Pecten magnolia (71223 91374 203554 208083 208126) | |
| Miocene | USA (California) | Pecten magnolia (208082) | |
| Burdigalian | Egypt | M. ziziniae (34913 34918) | |
| Badenian | Poland | M. latissima (32515) | |
| Tortonian - Messinian | Malta | M. latissima (141542) | |
| Messinian | Malta | M. latissima (141543) |