| Planorbella duryi (Wetherby, 1879) Seminole Rams-horn |
| form seminolis [scalariform morph] |
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Alive on shoreline, Lake Oneida, University of North Florida Campus, Duval Co., Florida 2/22/2005 |
| This morph bears a striking resemblance to Planorbella scalaris (Jay, 1839) of south Florida. The latter is usually more narrowly umbilicate and generally with the posterior aperture margin protruding more than the anterior shell margin (when viewed from the spire end) while this morph is usually more widely umbilicate and generally with the anterior aperture margin protruding more than the posterior shell margin. |
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Planorbella duryi and Planorbella scalaris comparison from Burch (1982) |
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FIG. 739. Planorbella duryi form seminolis | FIG. 740. Planorbella scalaris |
| Burch, J. B., 1982. Freshwater snails (Mollusca: Gastropoda) of North America. E.P.A., Cincinnati, vi + 1-294 incl. numerous B&W plates and figs. April. |
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