Marjan van Hulsel, the student doing fieldwork now in Peru on carinated shells, has started in the second region. She is located in Tembladera, Dept. Cajamarca.
On her second day, she made an interesting observation. With two taxa of Scutalus known from the region, S. cretaceus and S. baroni, she found a transition between the two species. This was expected already, based on shells collected in the 1950s by Wolfgang Weyrauch (in the Tucum??n museum). However, it was not known where this transition zone was located and how extended is was. Marjan observed a transition that extended only a few meters.
Obviously, we have now a good starting point for further investigation.