Posterior Ridge and Posterior Slope
Alasmidonta heterodon |
Alasmidonta varicosa | The posterior end of the shell may have useful features for identification, including a pronounced posterior ridge in some species, often combined with a clearly defined posterior slope. Species of Alasmidonta have a short, steep slope. |
Lampsilis cariosa |
Leptodea ochracea | In some species, such as A. heterodon, the ridge and slope may be more rounded than, for example, in A. varicosa. Genus Leptodea has a strongly pronounced, edge- like ridge in several species. The posterior slope in Lampsilis species is broader and flatter. |