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Macrocoelia magna
Taxonomy
Rafinesquina magna was named by Butts (1942). Its type specimen is USNM 98199, a shell, and it is a 3D body fossil.
It was recombined as Macrocoelia magna by Cooper (1956).
It was recombined as Macrocoelia magna by Cooper (1956).
Synonymy list
| Year | Name and author |
|---|---|
| 1942 | Rafinesquina magna Butts p. 85 figs. pl. 86, figs. 1-4 |
| 1956 | Macrocoelia magna Cooper pp. 894 - 895 figs. Plate 231, C, figures 9-14; plate 232, A, figures 1-7; plate 235, E, figures 17-21; plate 236, C, fi |
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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.
†Macrocoelia magna Butts 1942
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell large for the genus in adult form, moderately convex, wider than long with the greatest width at the hinge in the young but near the middle in old adults. Anterior margin broadly rounded; lateral margins generally oblique. Surface marked by costellae of unequal size, the costellae at the posterior very different in size, the larger ones separating I to 3 finer ones. Costellae on the anterior part of the valves becoming more uniform in size, but I to 3 finer costellae may be seen between the coarser ones although this is not so frequent as at the posterior of the valves. Finer costellae cancellated by strong fila. A few oblique wrinkles occurring on each side of the beak along the posterior margin.
Pedicle valve moderately convex in lateral profile with the greatest convexity located slightly anterior to the middle. Lateral slopes moderately steep ; posterolateral slopes to cardinal extremities gentle. Interarea short ; approximately orthocline. Foramen minute, pseudodeltidium short, not strongly arched. Brachial valve moderately and fairly evenly concave; posterior two-thirds gently concave but anterior third somewhat abruptly bent anteriorly. Cardinal extremities very slightly deflected in an anterior direction. Interarea short ; chilidium short and low. |