Chirality in Seashells
Numéro d’image : 12635851
| Seashells have a handedness, that is they are chiral, and virtually all of them are right-handed. Most gastropod shells are spirally coiled. The majority (over 90%) of gastropod species have dextral (right-handed) shells, but a small minority of species and genera are virtually always sinistral (left-handed), and a very few species (for example Amphidromus perversus) show a mixture of dextral and sinistral individuals. If a coiled gastropod shell is held with the spire pointing upwards and the aperture more or less facing the observer, a dextral shell will have the aperture on the right-hand side, and a sinistral shell will have the aperture on the left-hand side. | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Winters, Charles D. |
| Taille de l’image : | 3232 px × 1871 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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