scalariform freak / mutación escalariforme
Sinistral Paralaoma are rarely collected. This species is common throughout NZ. The photo was taken by D.J. Roscoe, DOC.
two shells including one rare sinistral (left-handed) individual.
Sinistral shell. I found this near the mouth of the 10-Mile River while looking for shoulderband snails.
I have found a few juvenile sinistral Oreohelix up to this point but never an adult (after several years of searching). I let out a big hoot when I found it.
Found immediately by the creek.
Note: This image was not taken in one shot. It is a compilation of 54 images with the shells scaled in size in relation to the penny. The identifications of these shells can be found on http://www.inaturalist.org/calendar/cedric_lee/2013/4/27.
Sinistral specimen (right) with normal dextral specimen (left.)