Hi Nora and all,
According to the supplement to The Festivus, November 12, 1992 "Additions to
the Panamic Province Gastropod (Mollusca) Literature 1971 to 1992" by Carol
Skoglund (page 3), Collisella is now a SYNONYM of Lottia.
Her source cited is: David R. Lindberg, "Name Changes in the Acmaeidae." The
Veliger 29(2):142-148 (October 1, 1986).
So now, I have all of my Collisella renamed Lottia.
Regards,
Travis