vburton's picture

Clausilia & Cochlodina (was incorrectly Balea perversa)

Observed: 19th May 2012 By: vburton
Amateur Entomologists' SocietyBritish Mycological SocietyS159 Neighbourhood Nature - course complete
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Description:

Lots of these conical brown shells of varying sizes crawling over felled conifer log bark.

Identifications
Species interactions

No interactions present.

Comments

martinjohnbishop's picture

Picture 2 is Cochlodina

Picture 2 is Cochlodina (Cochlodina) laminata

vburton's picture

Oh dear

Are the teeth less obvious in the live animal?

martinjohnbishop's picture

Yes, the animals are covering

Yes, the animals are covering the teeth.
Balea is only 6-8 mm long and a different shape
http://www.ispot.org.uk/node/260102

vburton's picture

Thanks

Thanks for the info. I could have sworn I took photos all of the same individual, but I must have muddled them up. One of the problems using photos for ID.

dejayM's picture

differences

I have agreed to the the one on the left as C.bidentata and the one on the right as B.perversa - it is pretty barrelled.
http://www.habitas.org.uk/molluscireland/species.asp?ID=42
dj

martinjohnbishop's picture

The lip shape is that of Cochlodina

not Balea. Balea would have a narrow lip and a rather squarish mouth. In Cochlodina the lip is bluntly thickened and reflected as in the right hand photograph. If we were given the size dimensions it would be even more obvious.
Regards,
Martin

dejayM's picture

shapes

You are right (of course) looking at mouth shape only, this then, I think, is also likely to be C.bidentata.
Derek

martinjohnbishop's picture

The right hand picture

shows a snail with a glossy shell and weak striations.
Clausilia bidentata is strongly and deeply striated.
Regards,
Martin