At 05:33 AM 12/21/2003, you wrote:
>I have read in several places that species with varices produce the
>next entire intervarical shell and varix in one go. One even claimed
>that the apparent growthlines are not growthlines!
--
Andrew Grebneff
Dunedin, New Zealand

As I understand it, the growth obviously is not instantaneous. Rather,
there are long periods of rest, non-growth, between periods of active
growth from one varix to the next. This was observed by Teri Marché in a
home tank and may have been documented by her. I'll try to track it down.

John