How does one distinguish between Persicula tessellata and P. accola?

Are both valid, full species?

The Marginella book shows accola as a form of the variable tessellata
but doesn't describe its distinguishing features.  Most listings on the
WWW show accola as a full species.  Some WWW pictures of "accola" look
essentially identical to others labeled "tessellata."

If any Cystiscidae experts can clarify this mess, I would greatly
appreciate it.
--
Cecil N. Bankston
Baton Rouge, LA
USA

----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------