Hi Burton
I got tired of digging around through ICZN - XI for a answer
... but the sample they list in the glossary is with -oidea

In:
Borror, Donald J. 1988 - Dictionary of Word Roots & Combining forms
List it as:  - oidea
for the animal kingdom.

However... I am currently working with Trochids and it is TROCHACEA
In the following
Hickman, Carole S. & James H. McLean - 1990
Systematic Revision & Supra-generic Classification of Trochacean Gastropoda

Vaught, Kay Cunningham; R. Tucker Abbott & Kenneth Boss (Eds) - 1989
A Classification of the Living Mollusca

Millard calls it TROCHOIDEA
Millard, Victor G. - 2001
Classification of World Wide Mollusca

For now I am sticking with TROCHACEA
Unless someone cares to correct me if I am wrong for doing so.
(and it would be appreciated if I am)

Leslie


-----Original Message-----
From: Conchologists of America List [mailto:[log in to unmask]]On
Behalf Of Burton Vaughan
Sent: Thursday, June 13, 2002 12:20 PM
To: [log in to unmask]
Subject: Superfamily Taxonomic Rules

I notice that superfamily names of pulmonate shells have been written
variously with the "-idea" suffix or with the "-acea" suffix, depending on
source. Superfamily names in Abbott's Seashells Compendium always end in
"-acea,"  though Abbott used the "-idea" ending in his earlier land shell
book. Is there now a preferred ending for specifically the superfamily level
(not suborder)? Or, am I just seeing out-of-date usage in some cases?

-Burton