A line of periwinkles,Nodilittorina unifasciata,at the edge of a mussel bed,Mytilus galloprovincialis,on a rocky shore at Blairgowrie,Victoria. These animals live in the intertidal zone,exposed to wind and sun for several hours at each tide. Each uses a different way to attach to the rock. Periwinkles have a snail-like shell with a horny lid,the operculum. The animal fixes itself to the substrate by means of its foot. In response to drying it produces a mucus that covers the mouth of the shell and hardens to a firm temporary attachment,with the operculum completely sealed.Mussels anchor themselves by means of a byssus - a system of threads that act like guy-ropes,allowing the animal to move with currents whilst attached to the substrate. The picture also shows scattered small limpets,which pull themselves into tight contact with the rock by means of a foot acting as a sucker | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 5212 px × 3468 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |