Dicharax species group 1

Remarks

This species group is characterized by a usually strongly ribbed shell, a fringed aperture, and most species (exception: D. floridus) have a large space between the inner and outer peristomes.

The R3 swelling of D. obscurus is similar to that of the species belonging to the species group 5, but it is included in this group due to the fringed aperture and the large space between the two peristomes.

See also remarks under Dicharax species group 2 regarding D. bicrenatus .