Group E Key

Group E. Wider than tall; reflected lip, umbilicate or rimate

E1. Heliciform, reflected lip, rimate, globose to subglobose - Mesodon (in part)

E2. Heliciform, reflected lip, umbilicate, subglobose - Allogona profunda

E3. Heliciform, reflected lip, umbilicate, depressed to discoidal – Triodopsis, Daedalochila, Vallonia

E1. Heliciform, reflected lip, rimate, globose to subglobose - Mesodon (in part)

These two species are typical Mesodon snails with the more-or-less globose shell. What distinguishes them from other Mesodons is the rimate umbilicus and what distinguished them from each other is the parietal tooth and size. The species are Mesodon thyroidus, the White-lip Globe, (left or 1st) and Mesodon clausus, the Yellow Globelet (right or 2nd).

The White-lip Globe is slightly less globose, a wider and thicker apertural rim, and has the parietal tooth. The Yellow Globelet is smaller, more globose and lacks a parietal tooth. Go to the Rimate Mesodon Page.

E2. Heliciform, reflected lip, umbilicate, subglobose - Allogona profunda

Adults of the Broad-banded Forestsnail are large, about 1-inch in diameter with a wide umbilicus; there is a thickening or tooth on basal loop of the peristome (the reflected aperture). The brownish color banding may or not be present in all specimens and is mostly lost on weathered shells.

E3. Heliciform, reflected lip, umbilicate, depressed to discoidal – Triodopsis, Daedalochila, Vallonia

These are a curious grouping of species. They all fit into the general Group E characteristics: wider than tall; reflected lip, umbilicate or rimate but diverge from E1 and E2 by not being globose (or subglobose.).

Their umbilicuses, as seen in the images below - Triodopsis, a Threetooth Snail, Daedalochila a Liptooth snail , and Vallonia, a Vallonia Snail - are all open but vary in form. The umbilicus in Triodopsis is more tube-like, while in the other two species, it is small but the whorls spin out to widen the area. These differ in size as well, as explained below.