|[Note Guidelines] Photographer's Note|
|Lesser know backyard critters III:|
This is a 17 mm big Plaited door snail (Clausiliidae; Cochlodina laminata; Glatte Schliessmundschnecke). It stays hidden under logs when dry but climbs tree trunks when humid. You find the snail all over Europe. The determination of the species is tricky, you really should dissect the snail and study the form of the calcareous lock and key at the mouth of the shell (you can see the bright yellow outlines of the lock through the shell). Lock and key are both formed by the mantle of the snail. The mantle is barely visible here, protruding slightly from the mouth.
I used a macro lens, a macro double flash with dispersers, a one-legged tripod (?), 1/125 and f 22. The picture was cropped, sharpened, contrasted and lightened in PS, some glare and dirt particles were removed with stamp.
All Clausiliid shells seem to have lefthanded turns. This asymmetry is predetermined in the egg cell and the first cellular divisions are asymmetric. This implies that the handedness of a shell is really determined by the mother producing the asymmetric egg ("maternal effect"). The book "Right Hand, Left Hand: The Origins of Asymmetry in Brains, Bodies, Atoms and Cultures" by Chris McManus tells it all.
anel, cicindela, JORAPAVI has marked this note useful
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- [2007-04-23 6:51]
So klein ist diese erstaunliche Schliessmundschnecke! Und wunderschön das hohe Häuschen. Nicht ganz einfach diese zu fotografieren! Es ist Dir aber eine interessante Komposition gelungen, mit der Umkehrung des Schneckleins. Und danke auch für die Erklaerungen.
Einen schönen Tag wünscht Dir
- [2007-04-23 14:35]
Belle position d'équilibriste.
- [2007-04-23 15:35]
Hello Dietrich, interesting snail and pose!, i really like the photo, congrats..
Una toma my bien detalla y contrastada con el fondo, Saludos
Another very interesting presentation. I really do not remember to see on TN pictures of Clausiliidae snails. Very nice - mobile composition, with very good details especially well seen on the snail's head. Note is as always very informative.
Greetings from Lodz,
PS. Thanks for your friendly replay for post about Empididae fly :)