Anna,
You have me stumped with the spotted snail. Is there any chance of getting
a picture? I am quite intrigued as it doesn't seem to ring a bell.
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. I have kept (in fact still have a couple) two
species of nerites from Mexico in my tanks. As you say, they do quite well.
One of the species I kept has direct development like your Theodoxus
fluviatilis, but I had only females, so nothing came of it. We do not seem
to be getting any of the snails imported from the Pacific - probably a fish
and game issue.
Tom
-----Original Message-----
From: Conchologists List [mailto:[log in to unmask]]On Behalf Of
Anna Robinson
Sent: Saturday, May 12, 2007 5:23 PM
To: [log in to unmask]
Subject: Re: Help With Neritidae
Hi Tom
Thanks for the pictures and info. From the looks of it, you are definitely
right about the Vittina coromandeliana, and the Septaria porcellana is spot
on. However, the species sold to us as "Clithon brenspinas" is completely
different: the snails we receive under this name have identical shell
morphology to the Vittina coromandeliana, but a more reddish background
with spots instead of stripes - they are known by the common name of Ruby
Nerite. Perhaps they are simply a colour variant of the Vittina
coromandeliana, and not a separate species at all. The plot
thickens . . .
All these snails do very well here in our freshwater tanks, living perhaps
3 or 4 years, growing to about 3/4 of an inch, and keeping the tanks really
clean (apart from dozens of egg capsules). It is quite rare to lose a
snail. However, for reasons unknown the Septaria do seem to be harder to
keep alive (not to mention impossible to get off the glass if you want to
move them!) and because of this are not commonly sold.
Thanks for taking the time to send me all these details.
Kind regards,
Anna
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