> Septaria tend to live in areas of swift current, often below
> waterfalls,
> thus the tenacity in holding onto the glass and probably the lack of
> doing as well in an aquarium.

Tom, my Septaria from Nadi, Fiji were living in turbid & slow current, on
boulders set in mud (surrounded by Thiara).

They do indeed grip well, but not nearly as tenaciously as patellids or
acmaeids. I could always get them off by hand, without damaging the
apertural margins.

Regards
Andrew
(temporarily in Calgary, Alberta)

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