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Mediospirifer audaculus
Taxonomy
Delthyris audacula was named by Conrad (1842).
It was recombined as Spirifer audacula by Prosser and Kindle (1913); it was recombined as Brachyspirifer audaculus by Cooper (1944); it was recombined as Mediospirifer audaculus by Johnson (1970).
It was recombined as Spirifer audacula by Prosser and Kindle (1913); it was recombined as Brachyspirifer audaculus by Cooper (1944); it was recombined as Mediospirifer audaculus by Johnson (1970).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1842 | Delthyris audacula Conrad p. 262 |
| 1913 | Spirifer audacula Prosser and Kindle pp. 192 - 193 figs. Plate XVIII, Figs. 7-9 |
| 1944 | Brachyspirifer audaculus Cooper p. 346 |
| 1970 | Mediospirifer audaculus Johnson p. 199 |
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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.
†Mediospirifer audaculus Conrad 1842
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C.M. Prosser and E.M. Kindle 1913 | Shell medium size; valves moderately convex in young specimens, becoming ventricose in old shells; hinge-line generally ex· tended beyond the width of the shell below. Ventral valve usually more convex than the dorsal; incurved beak; cardinal area commonly of more than medium height; longitudinally striated and divided in the middle by the delthyrium which is about twice as high as wide; mesial sinus well defined, extending to the apex, of moderate width, rather deep and generally rounded at the bottom. Dorsal valve moderately convex; beak small and slightly incurved; cardinal area linear; mesial fold prominent, rising abruptly at the sides and rounded or slightly flattened on top; cardinal angles slightly reflected. Surface marked by twl'nty or more simple plications on each side of the fold and sinus and the principal ones, especially of the ventral valve, are often markl'd along the center by a threadlike groove; toward the front are numerous, often imbricating, concentric lines. |