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Euchasma blumenbachi
Taxonomy
Conocardium blumenbachium was named by Billings (1859) [Type designated by Pojeta & Runnegar 1976.]. Its type specimen is GSC 445, a shell, and it is a 3D body fossil. Its type locality is Pillage Bay, Mingan Islands, which is in a Cassinian carbonate dolomite in the Romaine Formation of Canada. It is the type species of Euchasma.
It was recombined as Euchasma blumenbachia by Kobayashi (1933); it was recombined as Euchasma blumenbachii by Boyce et al. (2000); it was recombined as Euchasma blumenbachi by Logan et al. (1863), Billings (1865), Twenhofel (1938), Pojeta and Runnegar (1976), Wagner (1997), Rohr et al. (2008) and Wagner (2023).
It was recombined as Euchasma blumenbachia by Kobayashi (1933); it was recombined as Euchasma blumenbachii by Boyce et al. (2000); it was recombined as Euchasma blumenbachi by Logan et al. (1863), Billings (1865), Twenhofel (1938), Pojeta and Runnegar (1976), Wagner (1997), Rohr et al. (2008) and Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1859 | Conocardium blumenbachium Billings p. 350 |
| 1863 | Euchasma blumenbachi Logan et al. p. 113 figs. f. 22a-b |
| 1865 | Euchasma blumenbachi Billings pp. 221, 360 - 361 figs. f. 348a-b |
| 1933 | Euchasma blumenbachia Kobayashi pp. 293 - 294 |
| 1938 | Euchasma blumenbachi Twenhofel pp. 55 - 56 figs. pl. 11 f. 1-2 |
| 1976 | Euchasma blumenbachi Pojeta and Runnegar |
| 1997 | Euchasma blumenbachi Wagner |
| 2000 | Euchasma blumenbachii Boyce et al. p. 110 |
| 2008 | Euchasma blumenbachi Rohr et al. pp. 81 - 82 figs. pl. 1 f. 1-13; txt. f. 6 |
| 2023 | Euchasma blumenbachi Wagner p. 2942 |
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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.
†Euchasma blumenbachi Billings 1859
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. M. Rohr et al. 2008 | Strongly inflated, moderate sized (up to 33 mm long, 34 mm high, 18 mm wide), about 20 radial ribs that do not increase in number during growth; fine co-marginal ornament intersects ribs at acute angle; prominent anterior lobe, dorsal part of gape elliptical, radial ribs form zigzag commissure. Anterior gape narrow, marginal denticles visible immediately inside commissure. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Floian to the top of the Blackhillsian or 477.70000 to 470.00000 Ma
Collections (19 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Jeffersonian | Canada (Newfoundland) | Euchasma blumenbachi (195785) | |
| Jeffersonian | Canada (Newfoundland and Labrador) | Euchasma blumenbachi (133147) | |
| Cassinian | USA (Virginia) | Euchasma blumenbachi (99218 99220) | |
| Cassinian | Canada (Quebec) | Conocardium blumenbachium (56519) Euchasma blumenbachi (101743) | |
| Cassinian | Canada (Newfoundland) | Euchasma blumenbachi (195782 195783 195784) | |
| Cassinian | Canada (Newfoundland and Labrador) | Euchasma blumenbachi (56150 133127 133128 133134 133140) Euchasma blumenbachii (69196) | |
| Tulean - Blackhillsian | United Kingdom (Scotland) | Euchasma blumenbachi (188697 188699 188715) | |
| Floian | Canada (Newfoundland) | Euchasma blumenbachi (195748) |