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Bimuria immatura
Taxonomy
Bimuria immatura was named by Cooper (1956). Its type specimen is USNM 110976g, a shell, and it is a 3D body fossil. Its type locality is Porterfield Quarry, 5 miles northeast of Saltville, which is in an Ashbyan reef, buildup or bioherm limestone in the Edinburg Formation of Virginia.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Bimuria immatura Cooper pp. 766 - 767 figs. Plate 211, A, figures 1-13 |
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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.
†Bimuria immatura Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell small, about twice as wide as long in the adults, cardinal extremities rounded, auriculate. Anterior margin broadly rounded. Surface unornamented except for concentric lamellae of growth and fine thin lamellae that cover much of the shell.
Pedicle valve strongly convex with the greatest curvature in the region of the umbo. Median region swollen; anteromedian portion somewhat swollen. Front and lateral slopes moderately steep. Ears convex. Delthyrium very wide; interarea short and pseudodeltidium rudimentary. Foramen open, in the form. of a short, oblique tube. Brachial valve deeply concave, following the curvature of the pedicle valve closely, deepest in the median region ; front and lateral margins inflected toward the brachial valve; ears concave. Interarea short, almost orthocline in position. Chilidium short but wide. Umbo convex and forming a small knob at the center of the valve. Interior of pedicle valve with short and wide teeth ; dental plates absent ; musculature not visible. Inside the brachial valve 2 high, thin septa arise not far anterior to the cardinalia, diverge gradually as they extend nearly to the front margin. A small, median septum, thick but short, located between the 2 lateral septa at their place of origin. Adductor muscles attached to elevated papillose callosities on the outside of the lateral septa. Brachial processes rudimentary, cardinal process absent. |