Post by Robert Nordsieck on Nov 16, 2010 12:17:39 GMT
I did not rest ;D, though I overslept this morning...
Anyway, here is a new one: Spring snails (Hydrobiidae) are very tiny snails (around 3 mm in size), which occur in springs (really???), but also in brackish water, in ground water and even in caves.
From an environmental biologist's view this family is very very interesting, because its species usually indicate clean water. On the other hand they are of course always threatened as soon as man enters the game
As I am not firm with English spring snails, this page is mainly about the German and especially the Austrian ones. This, I think, however, is interesting enough. And some species occur in Britain as well.
Picture by Alexander Mrkvicka, Vienna.
This is a spring snail (Bythinella pareyssii) from a thermal spring in Lower Austria. The big black thing is a thermal spring nerite, Theodoxus prevostianus, which itself is smaller than 1 cm!
Post by Robert Nordsieck on Nov 16, 2010 18:45:35 GMT
It surely does! So does the one above - I checked, the nerite in nature is as large as the spring snail on this picture. So images how tiny the spring snail must be in nature! Also how many spring snails found a place on that leaf lying in the water - a very normal tree leaf. Ah, this calls for a poll