| Radiographic examination revealed opacities consistent with bony structure in the auricles of the ears, with the right more prominent than the left. |
| The auriculate hafting area is expanded-rounded with a hafting constriction along the side edges near the auricles. |
| The auricles are small, clearly separated from the anterior and posterior margins of the shell and are found in the plane of the closing of the valves. |
| The new species differs from it in being narrower and higher at a comparable growth stage and in having less oblique auricles. |
| It has a real beating heart with all its auricles, ventricles and valves in their anatomically correct positions. |
| The auricles in early ontogeny are relatively large and distinctly trigonal, with their free margins meeting the hinge line at acute angles. |
